Date: Sat, 30 Dec 2000 05:10:29 -0800 From: "kimyeung@ultraline" Subject: Re: 2300CD Low unservoed dose rates To: "''Linac-Eng@plato1.aristotle.net' '" Message-id: <3A4DDEC4.DBF2D80D@netvigator.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi Colleagues, Happy New Year! The unservoed dose rates of 2300CD are reducing for all energies. 6x is more pronounced, and its unservoed dose rate is less than the nominal value. The 2300CD had suffered from loose solenoid problem about one year ago and now all the set screws are tightened and beam flatness and symmetry of all energies are good. The low unservoed dose rate problem occurs at all gantry angles. We had tried to adjust Gun I, AFC and RF driver, but failed to increase the unservoed dose rate. Could anyone advise what are the possible causes of the low unservoed dose rate? Thanks in advance. Kim Yeung --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Siemens SimView 3000 Date: Thu, 28 Dec 2000 14:47:16 -0800 From: Francis Tiss Subject: Re: Siemens SimView 3000 To: "Watters, Dan" Cc: linac-eng@plato1.aristotle.net Message-id: <00f501c07120$20e5d800$0100a8c0@mshome.net> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi Dan, Your PLC processor has stoped. You need to reload the programme from the EPROM. To do this, move the start/stop switch from start to stop and back to start while holding the reset switch up (on reset). The green RUN LED should turn ON. If this doesn't happen you may have more problems with your PLC. You can call Siemens Power Engineering people for support, they use these PLCs a lot. Regards Francis Tiss Medtech Solutions ----- Original Message ----- From: "Watters, Dan" To: "'linac-eng@plato.aristotle.net'" Sent: Wednesday, December 27, 2000 3:11 PM Subject: Siemens SimView 3000 > Hi All, > > I realize the world isn't overpopulated with SimView 3000's but hopefully > someone on this list can help. We have no movements, ie gantry, table, II, > etc. and the right side from the Analog Input PCB on the D107 (PLC) seems to > be dead. The stop light on the CPU board is blinking and the run light is > not on. I have tried a reset but if I remember correctly from school there > is some trick to this that I seem to have forgotten. (Getting old is a real > PITA). Checked all wiring connections, did more than a few power recycles, > and reseated all PCB's along with checking pins on the backplane and the > PCB's. All power supplies are good. > > If anyone out there has any ideas I would appreciate hearing them. > > Hope you all had a very Merry Christmas and I wish you a safe and Happy New > Year. > > TIA > > Dan Watters > University Medical Center > Tucson, AZ. > --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Siemens ZXT Table Top Removal Date: Wed, 27 Dec 2000 12:10:37 -0800 From: John Somers Subject: Re: Siemens ZXT Table Top Removal To: "Watters, Dan" , "'linac-eng@plato1.aristotle.net'" Message-id: <4.1.20001227150354.00944e70@radonc17.ucsf.edu> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Dan, the tabletop can be removed via the 6 or 8 allen bolts around the rotation bearing. These are recessed, but you can see them after removing the central panel on the tabletop. I think you'll have to rotate the tabletop to get all these bolts out. Take the bolts out, the tabletop will stay in place on the bearing until you lift up on it. Takes two people to lift it off. While you have the tabletop off, you might want to modify the cover of the longitudinal drive. Just cut a slot in the sheet metal, then later this cover can be removed without having to remove the tabletop. Good luck, John Somers At 03:23 PM 12/27/00 -0700, Watters, Dan wrote: >Hi All, > >Thank you to those that responded to my email concerning our SimView 3000. >I got the CPU reset procedure figured out right after I sent the email. > >Now another question. Have any of you out there ever removed the table top >on a ZXT table? I just need to remove the portion that can be unlatched and >rotated. Not the carriage itself. I want to remove the cover that is over >the longitudinal drive assembly to clean it and check out a noise that is >emanating from that area. If anyone out there has had the pleasure of doing >a repair in this area please provide the "secret" (since they don't seem to >be in the book) instructions for getting the table top off. > >Thanks as always and Happy New Year to all, > >Dan Watters >Radiology Engineering >UMC Tucson --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Siemens ZXT Table Top Removal Date: Wed, 27 Dec 2000 14:23:39 -0800 From: "Watters, Dan" Subject: Siemens ZXT Table Top Removal To: "'linac-eng@plato1.aristotle.net'" Message-id: <6CE096D0CDF4D211A3110008C75D0752360577@XChange.umcaz.edu> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi All, Thank you to those that responded to my email concerning our SimView 3000. I got the CPU reset procedure figured out right after I sent the email. Now another question. Have any of you out there ever removed the table top on a ZXT table? I just need to remove the portion that can be unlatched and rotated. Not the carriage itself. I want to remove the cover that is over the longitudinal drive assembly to clean it and check out a noise that is emanating from that area. If anyone out there has had the pleasure of doing a repair in this area please provide the "secret" (since they don't seem to be in the book) instructions for getting the table top off. Thanks as always and Happy New Year to all, Dan Watters Radiology Engineering UMC Tucson --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Siemens Stabilipan One Date: Wed, 27 Dec 2000 13:31:13 -0800 From: Steersdad@aol.com Subject: Siemens Stabilipan One To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hello Friends, We need to obtain a copy of a manual and schematics for a Stabilipan 1 orthovoltage therapy system. This system was donate to a university in Israel by our company, but we did not have the correct documentation to go with it. Can someone please help us help our researchers in Israel? Please contact Doug Steers at Danbury Engineering. 203-797-9181 tel xraytherapy@aol.com (email) --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: INSTALLATION ENGINEER C.T @ LASER Date: Wed, 27 Dec 2000 09:23:21 -0800 From: alan mcgeever Subject: INSTALLATION ENGINEER C.T @ LASER To: Linac-Eng@plato1.aristotle.net Message-id: <000e01c07029$c7cf5e40$2b224382@alan> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT DEAR SIR, I AM VERY INTERESTED IN THE ABOVE POSITION WITHIN YOUR COMPANY, I AM A BRITISH NATIONAL CURRENTLY WORKING IN NORWAY, MY CONTRACT WITH THE PRESENT COMPANY WILL EXPIRE 31-DEC-2000. I CAN BE AVAILABLE FOR IMMEDIATE START. MY BACKGROUND HAS BEEN HEAVILY INVOLVED WITH INSTALLATION AND SERVICING OF RADIO-THERAPY EQUIPMENT (LINEAR ACCELERATORS), WITH 15 YEARS EXPERIENCE OF HOSPITAL EQUIPMENT INCLUDING X-RAY DIAGNOSTIC, AND C.T SCANNERS (SIEMENS). I AM 45 YEARS OLD AND MY PRESENT POSITION INCLUDED INSATALLATION OF (VARIAN) LINEAR ACCELERATORS THROUGH-OUT SCANDINAVIA AND POLAND . THE JOB DESCRIPTION SOUNDS VERY EXCITING, MY PAST EXPERIENCE HAS INVOLVED WORLD-WIDE TRAVEL FOR PERIODS UPTO 6 MONTHS. IF YOU ARE INTERESTED IN PURSUING FURTHER INFORMATION THEN PLEASE USE THE E- MAIL ADDRESS OR FAX THE NUMBER (NORWAY) 0047 63 97 07 56. I LOOK FORWARD TO YOUR TO YOUR REPLY ALAN McGEEVER --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: SIEMENS PRIMUS MLC Date: Wed, 27 Dec 2000 05:49:44 -0800 From: "Barnes, Bill" Subject: SIEMENS PRIMUS MLC To: "'Linac-Eng (E-mail)'" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello Fellow Engineers, 1. I am seeking History Data on Siemens MLC Failures. Such as: * Number of failures * Reason for failure * Estimated Downtime * Up-Time Service Center Response Times 2. Thanks in advance for your response. Merry Christmas and Happy Holidays to everyone!!!! Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu - -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOknoB6aK70jdHRmKEQLFpwCgwBixRnR9B27FU8oLHpGQp7A1bsAAn2H/ Dw+9UHYqoHeKftKpedYDJejV =Ey8z - -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOkn1BKaK70jdHRmKEQLk3ACdFtS/1DIxRLmTa/V499lg4pdJzyUAoMSR 0Wu3A6AI0Fv27bD2Qp/gDuFN =DiOo -----END PGP SIGNATURE----- --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: SIEMENS PRIMUS MLC Date: Wed, 27 Dec 2000 10:12:35 -0800 From: "Barnes, Bill" Subject: SIEMENS PRIMUS MLC To: "'Linac-Eng (E-mail)'" Cc: "Majordomo (E-mail)" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 - - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello Fellow Engineers, 1. I am seeking History Data on Siemens MLC Failures. Such as: * Number of failures * Reason for failure * Estimated Downtime * Up-Time Service Center Response Times 2. Thanks in advance for your response. Merry Christmas and Happy Holidays to everyone!!!! Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu - - -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOknoB6aK70jdHRmKEQLFpwCgwBixRnR9B27FU8oLHpGQp7A1bsAAn2H/ Dw+9UHYqoHeKftKpedYDJejV =Ey8z - - -----END PGP SIGNATURE----- - -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOkn1BKaK70jdHRmKEQLk3ACdFtS/1DIxRLmTa/V499lg4pdJzyUAoMSR 0Wu3A6AI0Fv27bD2Qp/gDuFN =DiOo - -----END PGP SIGNATURE----- -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOkoym6aK70jdHRmKEQJnZQCfdtSUs6YoPvvH6Py0cs5OQJLgbWIAmgMt rxgoEVBNaOU13+WoxhCsQSYt =tWTA -----END PGP SIGNATURE----- --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Siemens SimView 3000 Date: Tue, 26 Dec 2000 20:11:53 -0800 From: "Watters, Dan" Subject: Siemens SimView 3000 To: "'linac-eng@plato.aristotle.net'" Message-id: <6CE096D0CDF4D211A3110008C75D0752360576@XChange.umcaz.edu> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi All, I realize the world isn't overpopulated with SimView 3000's but hopefully someone on this list can help. We have no movements, ie gantry, table, II, etc. and the right side from the Analog Input PCB on the D107 (PLC) seems to be dead. The stop light on the CPU board is blinking and the run light is not on. I have tried a reset but if I remember correctly from school there is some trick to this that I seem to have forgotten. (Getting old is a real PITA). Checked all wiring connections, did more than a few power recycles, and reseated all PCB's along with checking pins on the backplane and the PCB's. All power supplies are good. If anyone out there has any ideas I would appreciate hearing them. Hope you all had a very Merry Christmas and I wish you a safe and Happy New Year. TIA Dan Watters University Medical Center Tucson, AZ. --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: SIEMENS PRIMUS MLC Date: Wed, 27 Dec 2000 04:54:19 -0800 From: "Barnes, Bill" Subject: SIEMENS PRIMUS MLC To: "Linac-Eng (E-mail)" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello Fellow Engineers, 1. I am seeking History Data on Siemens MLC Failures. Such as: * Number of failures * Reason for failure * Estimated Downtime * Up-Time Service Center Response Times 2. Thanks in advance for your response. Merry Christmas and Happy Holidays to everyone!!!! Billy Barnes B.S.E.T. Radiation Oncology Engineer Fox Chase Cancer Center 7701 Burholme Ave. Philadelphia, Pa. 19111 215-728-2997 215-728-4789 fax B_barnes@fccc.edu -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.8 for non-commercial use iQA/AwUBOknoB6aK70jdHRmKEQLFpwCgwBixRnR9B27FU8oLHpGQp7A1bsAAn2H/ Dw+9UHYqoHeKftKpedYDJejV =Ey8z -----END PGP SIGNATURE----- --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Downtimes / Up Times -Forwarded Date: Thu, 21 Dec 2000 19:09:27 -0800 From: "BEHTS BEHTS Xray (Angela Daley)" Subject: Downtimes / Up Times -Forwarded To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: MESSAGE/RFC822 Date: Thu, 21 Dec 2000 14:47:55 -0800 From: "(BEHTS-X-Ray)Angela Daley (Angela Daley)" Subject: Downtimes / Up Times To: Cc: Xray@health.qld.gov.au MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain Content-transfer-encoding: 7BIT Gentleman We are looking at statistics for linac treatments,namely in the area of of machine downtimes/uptimes ,scheduled repairs and maintenance. Any information provided would need to qualified:- ie-What is a normal treatment day period -What scheduled maintenance time is allowed -What scheduled reair time is allowed -Is repair time from when the machine goes down to when it becomes clinical -Linac daily runup/shutdown time allowed MERRY CHRISTMAS from the land DOWN UNDER Please reply to Xxray@health.qld.gov.au --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Position Available Date: Thu, 21 Dec 2000 11:40:37 -0800 From: Neil Johnston Subject: Position Available To: Linac-Eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: MULTIPART/MIXED; BOUNDARY="Boundary_(ID_ZEHZOG9ks/dArALr7F2mvg)" --Boundary_(ID_ZEHZOG9ks/dArALr7F2mvg) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT LAP of America L.C. LAP of America, based in Southern Florida, currently has openings for Installation Engineers, for their CT Simulation Laser Systems and Room Laser in North America. The successful candidate will be available to travel for the installations throughout the U.S. and Canada. Good customer communication skills and co-ordination of planning and installation scheduling required Support Help Desk and some minor repair duties in office. Knowledge of CT systems a plus but not required. Training will be provided. Excellent opportunity to grow with a rapidly expanding company and leader in the CT Simulation Laser marking systems. Please contact Neil Johnston at NAJ@lap-laser.com with resume. For more information on LAP and its product line please visit our web site at www.lap-america.com --Boundary_(ID_ZEHZOG9ks/dArALr7F2mvg) Content-type: text/x-vcard; name="Neil Johnston.vcf" Content-disposition: attachment; filename="Neil Johnston.vcf" Content-transfer-encoding: 7BIT BEGIN:VCARD VERSION:2.1 N:Johnston;Neil FN:Neil Johnston ORG:LAP of America, LC TEL;WORK;VOICE:5614169250 TEL;WORK;FAX:5614169263 ADR;WORK:;;1755 Avenida Del Sol;Boca Raton;FL;33432;USA LABEL;WORK;ENCODING=QUOTED-PRINTABLE:1755 Avenida Del Sol=0D=0ABoca Raton, FL 33432=0D=0AUSA URL: URL:http://www.lap-laser.com EMAIL;PREF;INTERNET:naj@lap-laser.com REV:20001206T153203Z END:VCARD --Boundary_(ID_ZEHZOG9ks/dArALr7F2mvg)-- --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: MERRY CHRISTMAS !!! Date: Thu, 21 Dec 2000 08:56:24 -0800 From: "Bush, Thomas M." Subject: MERRY CHRISTMAS !!! To: "@plato1 (E-mail)" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Wow.... quite a list of respondents on that query about "anyone there". I'm glad so many of you are still manning the store these days. So I want to wish all of you who replied including Bob, Dave, Don, Chris, Frank, Vincent, Robert, Peter, Richard, Lou, Richard and Jim a very Merrry Christmas. May your water pumps last forever and your targets never leak! Tom in Spooookaaaannneeee --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Varian MLC taxi chips. Date: Sun, 17 Dec 2000 20:53:13 -0800 From: Richard Kimball Subject: Re: Varian MLC taxi chips. To: Dave Pinchin , linac-eng@plato1.aristotle.net Message-id: <000a01c068ae$6f71c8a0$2cc6d6d8@mshome.net> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Check Newark. They recently filled a 15 month old backorder for me. Rich Kimball ----- Original Message ----- From: "Dave Pinchin" To: Sent: Sunday, December 17, 2000 7:51 PM Subject: Varian MLC taxi chips. > G'day, > Did anybody find a suitable source / replacement for the 7968 / 7969 taxi chips? > > Thanks > Dave. > > > > This email or attachment(s) may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury Health Ltd. > --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Varian MLC taxi chips. Date: Sun, 17 Dec 2000 17:51:40 -0800 From: Dave Pinchin Subject: Varian MLC taxi chips. To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT G'day, Did anybody find a suitable source / replacement for the 7968 / 7969 taxi chips? Thanks Dave. This email or attachment(s) may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury Health Ltd. --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: how does this service work Date: Fri, 15 Dec 2000 07:38:02 -0800 From: jcadilhac Subject: Re: how does this service work To: lancea@icon.co.za, linac-eng@plato1.aristotle.net Message-id: <002c01c066ad$03b25c90$329b10ac@Jack> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT ----- Original Message ----- From: To: Sent: Thursday, December 14, 2000 1:50 PM Subject: how does this service work > Hi from cape town,south africa. can some one pleaselet me > know how this service works and who are its main users > Thanks lance allen > -- > This message was sent using ICON i-mail > http://www.icon.co.za/ > > Here are the instructions for the mailing list. 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To contact the owner of a specific list, send mail to that list's approval address, which is formed by adding "-approval" to the user-name portion of the list's address. For instance, to contact the list owner for demo-list@plato.aristotle.net, you would send mail to demo-list-approval@plato.aristotle.net. To get another copy of this help message, send mail to Majordomo@plato.aristotle.net with a line saying help in the message body. VIII. COMMAND SUMMARY FOR ADVANCED USERS In the description below items contained in []'s are optional. When providing the item, do not include the []'s around it. Items in angle brackets, such as
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) from all lists. This _may not_ work if you have subscribed using multiple addresses. get Get a file related to . index Return an index of files you can "get" for . which [
] Find out which lists you (or
if specified) are on. who Find out who is on the named . info Retrieve the general introductory information for the named . intro Retrieve the introductory message sent to new users. Non-subscribers may not be able to retrieve this. lists Show the lists served by this Majordomo server. help Retrieve this message. end Stop processing commands (useful if your mailer adds a signature). Commands should be sent in the body of an email message to "Majordomo@plato.aristotle.net". Multiple commands can be processed provided each occurs on a separate line. Commands in the "Subject:" line are NOT processed. If you have any questions or problems, please contact "Majordomo-Owner@plato.aristotle.net". --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: how does this service work Date: Thu, 14 Dec 2000 04:50:25 -0800 From: lancea@icon.co.za Subject: how does this service work To: linac-eng@plato1.aristotle.net Message-id: <200012141243.OAA26030@mail450.icon.co.za> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi from cape town,south africa. can some one pleaselet me know how this service works and who are its main users Thanks lance allen -- This message was sent using ICON i-mail http://www.icon.co.za/ --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Varian 2300CD temperature controller Date: Wed, 13 Dec 2000 12:10:04 -0800 From: "Maddox, Jerry" Subject: RE: Varian 2300CD temperature controller To: "'kimyeung@ultraline '" , "'''Linac-Eng@plato1.aristotle.net' ' '" Message-id: <36298D09ED1AD311B4DC0008C7F4D4E103DFF929@phsexch6.partners.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT The temperature sensor is the RTD type, a wire resistor which varies slowly with temperature. It changes only a few ohms per degree, and is used in a sensitive bridge circuit. The changes you are seeing are due to a water leak to the resistor part, a common problem. Put in a new one. The throttling range is the gain or sensitivity, expressed in how many degrees it takes to move the valve over its range. It typically is set to 4, and may be adjusted some if your water is very cold, causing oscillations of the valve. More commonly, the bypass valve is opened more, to lower the gain and stop oscillations. So your statement is incorrect, set it to 4. Too high a setting will allow the temperature to vary too much. Spec is 40C, +/- 1C, to maintain waveguide dimensions which depend on temperature. AFC will not work if temperature is very far out of this range, so that the resonant frequency is too far off. Bending magnet interlocks also will not work, due to the resistance change of the windings causing too much voltage changes. -----Original Message----- From: kimyeung@ultraline To: ''Linac-Eng@plato1.aristotle.net' ' Sent: 12/13/00 10:16 AM Subject: Re: Varian 2300CD temperature controller Hi Colleagues, I would like to ask how to adjust the throttling range? In ours it is set at 4 degree F. That means the controlled temperature range is from 35 to 44 degree C. Is it correct? (assuming 104 degree F gives out 7V) Thanks in advance. Kim Yeung --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Thank you. Date: Wed, 13 Dec 2000 09:28:47 -0800 From: Ward Dixon Subject: Thank you. To: Linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Thank you to everyone who emailed me and helped me to get back on the Linac list. I am now up and running. Your help is greatly appreciated. Thanks again, Ward Dixon --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Electromechanical Brakes. Date: Wed, 13 Dec 2000 09:38:52 -0800 From: Ward Dixon Subject: Electromechanical Brakes. To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT My question today is, does anyone know the manufacture of the electro mechanical breaks that are used on the Siemens ZXT treatment couch. There is a manufactures part number stamped on them but no name of origin. Thanks, Ward --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Varian 2300CD temperature controller Date: Wed, 13 Dec 2000 08:41:24 -0800 From: Virago1100@aol.com Subject: Re: Varian 2300CD temperature controller To: kimyeung@netvigator.com, Linac-Eng@plato1.aristotle.net Message-id: <62.9f88577.276900b4@aol.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Kim, In my experience the Throttling Range and other settings are as follows: Set Point A: 104 (40deg. C) Set Point B: N/A Ratio Adj. B: Not used since there is no "B" input, however it is usually set minimum. Throttling Range: 2 or Minimum You are correct in that if the controller is properly calibrated, the output at OP1 will be 7.5 vdc when the sensor is at the setpoint temperature. The internal "Cal-A" potentiometer is used to calibrate setpoint A. The temperature sensor should measure 1000 ohms at 70 degrees F. Jim McKenzie --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Varian 2300CD:temperature sensor Date: Wed, 13 Dec 2000 05:38:12 -0800 From: "kimyeung@ultraline" Subject: Re: Varian 2300CD:temperature sensor To: "''Linac-Eng@plato1.aristotle.net' '" Message-id: <3A377BC4.6A11D158@netvigator.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi Colleagues, We had two incidents of over temperature trips which were caused by a change of resistance of the temperature sensors. Both sensor resistance was changed from 1070 to 970 ohms. We suspected there might be an internal short. Can anyone kindly explain the "mechanism" of Varian HE Clinac's temperature control? Thanks in advance. Kim Yeung --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: reoccurring underdose problem Date: Tue, 12 Dec 2000 08:42:02 -0800 From: "Maddox, Jerry" Subject: RE: reoccurring underdose problem To: "'Moore, Lee '" , "''Linac-Eng@plato1.aristotle.net' '" Message-id: <36298D09ED1AD311B4DC0008C7F4D4E103DFF926@phsexch6.partners.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT The afc is most strongly affected by the beam where the gun current is largest, 6x. Try turning gun off to see this on scope pulses. I suspect you are dumping a lot of beam into the vacuum chamber walls. Keep the rep rate low and run for short times during troubleshooting, to avoid burning a hole in the wall, like the example shown in class at Varian. I like the starve tuning check of the afc, except for 6x, where the beam loading effects are large enough to shift the afc peak depending on the beam current. Starve tuning is still pretty close even on 6x. Sounds like a loose solenoid. Are you seeing large changes in the steering currents, and ssimilar (possibly smaller) changes on all energies when you look closely? Can you bring back the dose rate with a tweak of buncher or position steering? Make sure you do this briefly, and can put the voltages on the pcb back exactly! Record all pcb V's in case you hit the wrong pot. Recheck all. If it is a solenoid/steering problem, physics must be involved. Due to conservation of angle and momentum in phase space, all steering and energy changes must interact some. The physicist should check dosimetry, flatness, and symmetry during the problem before it is fixed, to prove that treatments were not affected. Then after the fix, same thing, all angles, plus leakage checks with film all over the gantry if large changes in steering were made. I would do star shots, too. Varian has a procedure for this which minimizes the relocation of the solenoid, and subsequent resteering. You will wind up requalifying your machine's beam geometry. An example: changes in angle r or t will affect coincidence as well as symmetry. The Lutz split field test (AP-PA coincidence) will show this inplane. -----Original Message----- From: Moore, Lee To: 'Linac-Eng@plato1.aristotle.net' Sent: 12/7/00 3:20 PM Subject: reoccurring underdose problem Hi all, Still having intermittant underdose problem with 6mv on 2300 c/d in all rep rates. All other energies are ok. The problem only occurs with gantry angles 90 to 140. I have attempted to retune with no success. But after monitoring load power 2 it appears to be an afc problem. I am unable to sweep on either side on resonance in manual mode and when dose is ok resonance is found with manual knob fully counterclockwise with only 1 peak. I believe I need to recalibrate afc balance so I can "recenter" resonance.. Not much experience there Any suggestions are appreciated. thanx --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: reoccurring underdose problem Date: Fri, 08 Dec 2000 13:39:25 -0800 From: Larry N Delorme Subject: RE: reoccurring underdose problem To: Linac-Eng@plato1.aristotle.net Message-id: <862569AF.006DC8C0.00@notesmta02.allina.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi Lee I had a similar problem on one of our 2100cs, it however was worse in electrons than photons. Our problem ultimately was that the accelerator solenoid was loose on the acc. waveguide. But we did this procedure before it was determined that this was the problem. Tune the beam at 0 degrees, turn off dose, pfn, & symmetry servos. Jumper out all associated I/Ls. Beam on and rotate gantry. If you are getting gross sym errors along with low/high dose rate it could be that you need to tweak your BUNR, BUNT, & SOL I pots on your 6X program board. Do this with other energies starting with high e' beams. If you see big symmetry and dose changes in these beams also you my have a "flopping solenoid". I would still start with retuning using SOL I first then moving on to BUNR &T next, remembering that the bunchers will also effect your steering. So be sure you record all program board readings before starting. Tweak SOL I for max output, tweak PFN & GUN I for desired unservoed output. Beam on and rotate again. If problem still there then move to bunchers once again tuning for max output. >From what I understand this type of problem will cause your AFC to whack out. Without the electron beam being properly bunched and shot down the acc guide it will detune it causing your AFC to try to find resonance. I think. I hope this makes sense. Larry --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Position available: Chief Engineer, University of Chicago Date: Fri, 08 Dec 2000 12:57:51 -0800 From: "Charles A. Pelizzari" Subject: Position available: Chief Engineer, University of Chicago To: linac-eng@plato1.aristotle.net Message-id: <4.2.2.20001208144719.00ae9100@128.135.32.20> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: MULTIPART/MIXED; BOUNDARY="Boundary_(ID_shfTULTLG6hesS+Rk/YhHA)" --Boundary_(ID_shfTULTLG6hesS+Rk/YhHA) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Position Available: Chief Engineer The University of Chicago Department of Radiation and Cellular Oncology The University of Chicago has an immediate opening for a Chief Engineer in Radiation Oncology. This individual has primary responsibility for management and maintenance of linear accelerators and associated equipment in the Department. This includes equipment specification and facility design in consultation with clinical physicists and department management; primary maintenance of equipment and management of relationships with equipment vendors and service providers; planning and implementation of hardware and software upgrades; development and implementation of QA procedures in collaboration with clincial physicists. The Department operates three clinics in Chicago and suburbs; a suitable individual could take a lead role in the overall management of this multi-site operation. Major equipment complement at all sites includes seven Varian linear accelerators (three 2100 CD, three 21EX, one 4-100), two Picker AcQSim / PQ5000 CT simulators, three Ximatron simulators. Five accelerators have computer controlled dynamic multileaf collimator and intensity-modulated beam delivery capability, four have portal imaging. All linacs and simulators are integrated with extensive VaRIS information systems. At the UC site are two 2100CD, one 21EX, one CT simulator, one Ximatron. Dynamic MLC delivery of intensity-modulated radiotherapy is in routine clinical use. In addition to its clinical operations, the Department has an active physics section with a number of research and development projects involving imaging and beam delivery in which the Chief Engineer could participate. Desired qualifications include significant knowledge and experience with some or all of the above hardware and software; ability to interact well with coworkers at all levels and with vendors; good communication skills. Thorough knowledge of computer hardware, software and networking is also desirable. Interested individuals should contact Charles A. Pelizzari, Ph.D. Director, Physics Section Radiation and Cellular Oncology 5758 S. Maryland, MC 9006 Chicago, IL 60637 Tel (773) 702-1688 Fax (773) 834-7299 c-pelizzari@uchicago.edu The University of Chicago is an equal opportunity employer. --Boundary_(ID_shfTULTLG6hesS+Rk/YhHA) Content-type: text/plain; name=ATT50914.txt Content-disposition: attachment; filename=ATT50914.txt Content-transfer-encoding: 7BIT Position Available: Chief Engineer The University of Chicago Department of Radiation and Cellular Oncology The University of Chicago has an immediate opening for a Chief Engineer in Radiation Oncology. This individual has primary responsibility for management and maintenance of linear accelerators and associated equipment in the Department. This includes equipment specification and facility design in consultation with clinical physicists and department management; primary maintenance of equipment and management of relationships with equipment vendors and service providers; planning and implementation of hardware and software upgrades; development and implementation of QA procedures in collaboration with clincial physicists. The Department operates three clinics in Chicago and suburbs; a suitable individual could take a lead role in the overall management of this multi-site operation. Major equipment complement at all sites includes seven Varian linear accelerators (three 2100 CD, three 21EX, one 4-100), two Picker AcQSim / PQ5000 CT simulators, three Ximatron simulators. Five accelerators have computer controlled dynamic multileaf collimator and intensity-modulated beam delivery capability, four have portal imaging. All linacs and simulators are integrated with extensive VaRIS information systems. At the UC site are two 2100CD, one 21EX, one CT simulator, one Ximatron. Dynamic MLC delivery of intensity-modulated radiotherapy is in routine clinical use. In addition to its clinical operations, the Department has an active physics section with a number of research and development projects involving imaging and beam delivery in which the Chief Engineer could participate. Desired qualifications include significant knowledge and experience with some or all of the above hardware and software; ability to interact well with coworkers at all levels and with vendors; good communication skills. Thorough knowledge of computer hardware, software and networking is also desirable. Interested individuals should contact Charles A. Pelizzari, Ph.D. Director, Physics Section Radiation and Cellular Oncology 5758 S. Maryland, MC 9006 Chicago, IL 60637 Tel (773) 702-1688 Fax (773) 834-7299 c-pelizzari@uchicago.edu The University of Chicago is an equal opportunity employer. --Boundary_(ID_shfTULTLG6hesS+Rk/YhHA)-- --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Xim! Date: Fri, 08 Dec 2000 11:28:17 -0800 From: "Villegas, Jose" Subject: Xim! To: 'Linear Accelereator submissions' Message-id: <351F39924BC5D311A35C0050DA2AC9B006580B@HCUNIVEXCH03> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi folks, Does anyone know what's the part number for a Ximatron couch pendant ( latest version)? Thanks. Jose R. Villegas Biomed Specialist Radiation Oncology, HB 200 Umass Memorial TEL: 508-856-4924 FAX: 508-856-5006 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: reoccurring underdose problem Date: Fri, 08 Dec 2000 08:22:09 -0800 From: "Turner, Guy" Subject: RE: reoccurring underdose problem To: 'Al Aqualino' Cc: 'Linac Engineers List' Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT The type of machine certainly could make a large difference in whether or not AFC is a likely source of the problem. It has been my experience that this would be somewhat unusual (not out of the question - but unusual) on a Varian Linac, especially in just one energy at just a specific range of gantry angles. Guy Turner, Ext. 6247 Radiation Service Engineer Information Security Manager "Any Enterprise When Fairly Once Begun Should Not Be Left Until All That Ought Is Won" PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or legally effective electronic signature. (2) this message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify us, disregard the foregoing message, and delete the message immediately. We apologize for any inconvenience this may have caused. > -----Original Message----- > From: Al Aqualino [SMTP:aa2h@virginia.edu] > Sent: Thursday, December 07, 2000 6:29 PM > To: 'Linac-Eng@plato1.aristotle.net' > Subject: RE: reoccurring underdose problem > > At 04:53 PM 12/7/00 -0600, someone wrote: > >Something doesn't feel right there. It's likely that anything that has > >changed to require balancing AFC would be common to all energies. > > Not necessarily. With the caveat that I am not a service engineer (I'm > only a physicist) and that the machine I fiddle with is an Elekta (not a > Varian), I will note that last month my linac suddenly began terminating > e15 treatments after 2 mu due to doserate, but only when the gantry was > near 55 degrees. I retuned the AFC, and the unit started running like a > champ. No problems since. > - Al Aqualino > Radiological Physicist, University of Virginia > > --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: reoccurring underdose problem Date: Fri, 08 Dec 2000 06:21:42 -0800 From: "Bitler, Richard L" Subject: RE: reoccurring underdose problem To: "'Moore, Lee'" , "'Linac-Eng@plato1.aristotle.net'" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi, If it is an AFC problem, I would try starve tuning to balance the AFC. Turn dose and PFN servos off. For a normal 300 dose rate, detune down to 150 with the PFN V pot. Tune AFC for PEAK dose rate using the AFC balance pot. This will raise the dose. Lower again with PFN V and repeat until the AFC is peaked at 150. Then Raise the dose rate back to normal, 330 unservoed for a 300 dose rate. Turn servos back on. Hope this helps. Rick Bitler Lancaster Health Alliance Lancaster, PA > -----Original Message----- > From: Moore, Lee [SMTP:lmoore@sjha.org] > Sent: Thursday, December 07, 2000 3:21 PM > To: 'Linac-Eng@plato1.aristotle.net' > Subject: reoccurring underdose problem > > Hi all, Still having intermittant underdose problem with 6mv on 2300 c/d > in > all rep rates. All other energies are ok. The problem only occurs with > gantry angles 90 to 140. I have attempted to retune with no success. But > after monitoring load power 2 it appears to be an afc problem. I am > unable > to sweep on either side on resonance in manual mode and when dose is ok > resonance is found with manual knob fully counterclockwise with only 1 > peak. > I believe I need to recalibrate afc balance so I can "recenter" > resonance.. > Not much experience there Any suggestions are appreciated. thanx --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Morning run-up & QA of Linacs Date: Thu, 07 Dec 2000 20:03:18 -0800 From: Smeliin@aol.com Subject: Re: Morning run-up & QA of Linacs To: steve.cripps@dchs.tas.gov.au, linac-eng@plato1.aristotle.net Cc: mary.lyntonmoll@dchs.tas.gov.au Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT That's a tech and physics problem; not an engineers'. Let the physicist earn his keep. --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: reoccurring underdose problem Date: Thu, 07 Dec 2000 17:57:12 -0800 From: david hall Subject: Re: reoccurring underdose problem To: "'Linac-Eng@plato1.aristotle.net'" , "Moore, Lee" Reply-to: hall.david@lycos.com Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Lee, Beam on in 6X, quickly tune afc in the manual mode, beam off and record the rf driver freq. Next beam on in your highest emode, run for ~5 minutes, tune afc manually and then beam off. Record the rf driver freq. Set the afc switch back to auto. Split the difference in frequencies and set the rf driver freq. to this number via the rf driver front panel screw. Sensitivity may also need adjusting, but this will get you to the center frequency. Regards, Dave Hall -- On Thu, 7 Dec 2000 15:20:47 Moore, Lee wrote: >Hi all, Still having intermittant underdose problem with 6mv on 2300 c/d in >all rep rates. All other energies are ok. The problem only occurs with >gantry angles 90 to 140. I have attempted to retune with no success. But >after monitoring load power 2 it appears to be an afc problem. I am unable >to sweep on either side on resonance in manual mode and when dose is ok >resonance is found with manual knob fully counterclockwise with only 1 peak. >I believe I need to recalibrate afc balance so I can "recenter" resonance.. >Not much experience there Any suggestions are appreciated. thanx > Great Gift Idea! FREE cell phone, internet ready at Lycos Marketplace http://www.inphonic.lycos.com/redirect.asp?referringpage=www.lycosd1 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: reoccurring underdose problem Date: Thu, 07 Dec 2000 16:28:58 -0800 From: Al Aqualino Subject: RE: reoccurring underdose problem To: "'Linac-Eng@plato1.aristotle.net'" Message-id: <5.0.2.1.2.20001207192254.00a744a0@holmes.acc.virginia.edu> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT At 04:53 PM 12/7/00 -0600, someone wrote: >Something doesn't feel right there. It's likely that anything that has >changed to require balancing AFC would be common to all energies. Not necessarily. With the caveat that I am not a service engineer (I'm only a physicist) and that the machine I fiddle with is an Elekta (not a Varian), I will note that last month my linac suddenly began terminating e15 treatments after 2 mu due to doserate, but only when the gantry was near 55 degrees. I retuned the AFC, and the unit started running like a champ. No problems since. - Al Aqualino Radiological Physicist, University of Virginia --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: reoccurring underdose problem Date: Thu, 07 Dec 2000 14:53:50 -0800 From: "Turner, Guy" Subject: RE: reoccurring underdose problem To: "'Moore, Lee'" , "'Linac-Eng@plato1.aristotle.net'" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Lee, Something doesn't feel right there. It's likely that anything that has changed to require balancing AFC would be common to all energies. Before I dedicated a lot of time tuning on AFC I would probably look for the cause of the weirdness at the gantry angles. I know I asked this before but don't remember what you said - did you look at the energy switch? It's possible that something could happen there and only be noticeable in 6MV. Guy Turner, Ext. 6247 Radiation Service Engineer Information Security Manager "Any Enterprise When Fairly Once Begun Should Not Be Left Until All That Ought Is Won" PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or legally effective electronic signature. (2) this message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify us, disregard the foregoing message, and delete the message immediately. We apologize for any inconvenience this may have caused. > -----Original Message----- > From: Moore, Lee [SMTP:lmoore@sjha.org] > Sent: Thursday, December 07, 2000 2:21 PM > To: 'Linac-Eng@plato1.aristotle.net' > Subject: reoccurring underdose problem > > Hi all, Still having intermittant underdose problem with 6mv on 2300 c/d > in > all rep rates. All other energies are ok. The problem only occurs with > gantry angles 90 to 140. I have attempted to retune with no success. But > after monitoring load power 2 it appears to be an afc problem. I am > unable > to sweep on either side on resonance in manual mode and when dose is ok > resonance is found with manual knob fully counterclockwise with only 1 > peak. > I believe I need to recalibrate afc balance so I can "recenter" > resonance.. > Not much experience there Any suggestions are appreciated. thanx --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Varian 80 leaf MLC Date: Thu, 07 Dec 2000 13:12:19 -0800 From: Dave Pinchin Subject: Varian 80 leaf MLC To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT G'day, Sorry if this one has already been done but.... Is there any overhaul method for the leaf motors or a reliable second source. Thanks Dave. This email or attachment(s) may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury Health Ltd. --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: reoccurring underdose problem Date: Thu, 07 Dec 2000 12:20:47 -0800 From: "Moore, Lee" Subject: reoccurring underdose problem To: "'Linac-Eng@plato1.aristotle.net'" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi all, Still having intermittant underdose problem with 6mv on 2300 c/d in all rep rates. All other energies are ok. The problem only occurs with gantry angles 90 to 140. I have attempted to retune with no success. But after monitoring load power 2 it appears to be an afc problem. I am unable to sweep on either side on resonance in manual mode and when dose is ok resonance is found with manual knob fully counterclockwise with only 1 peak. I believe I need to recalibrate afc balance so I can "recenter" resonance.. Not much experience there Any suggestions are appreciated. thanx --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Morning run-up & QA of Linacs Date: Thu, 07 Dec 2000 09:47:16 -0800 From: "Williams, Rod" Subject: RE: Morning run-up & QA of Linacs To: "'lenj@CancerBoard.ab.ca'" , Cripps Steve Cc: Lynton-Moll Mary , "Linac Engineers List Server (E-mail)" Message-id: <6D96BB4A81F6D211B1D20008C79FAA842D1B8A@wmhmail.whs.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Here in the good old land of the cheese heads I do a weekly run of all energies, dose servo off, print them out, save the prints in a book, do something off the p.m. list, not the Varian checklist but the stuff that needs monitoring like water joints, table p.m., water changes, MLC motor currents, wipe the grease off the rails, check fans, clean filters, stuff like that.. Rod.Williams@phci.org WAUKESHA MEMORIAL HOSPITAL 262-928-4734 > -----Original Message----- > From: Leonard C. Johnson [SMTP:lenj@CancerBoard.ab.ca] > Sent: Thursday, December 07, 2000 9:48 AM > To: Cripps Steve > Cc: Lynton-Moll Mary; Linac Engineers List Server (E-mail) > Subject: Re: Morning run-up & QA of Linacs > > The radiation therapists do the morning run-ups and brief > QA checks. If any problems are found then service is > called. If any dosimetry related issues arise then a > physicist is called. > > On Thu, 7 Dec. 2000 11:54:24 +1100 Cripps Steve > wrote: > > > Hi list, I am seeking some feedback from other centres > > about who does the morning run-up and morning QA checks on > > your linac's. I am aware of some centres where this is done > > by people other than radiation therapists - physicists, > > engineers etc. What happens at your centre? > > Thanks in advance for your help. > > > > Steve Cripps > > Engineering Operations Manager > > > > Royal Hobart Hospital > > Department of Radiation Oncology > > (WP Holman Clinic) > > GPO Box 1061L > > Hobart 7001 > > Australia > > > > Phone: > > Switch 03 6223 4000 > > Direct 03 6222 8618 > > Fax 03 6234 8036 > > Mobile 0408 136 906 > > International +61 3 6223 4000 > > > > ---------------------- > Leonard C. Johnson > lenj@cancerboard.ab.ca --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Morning run-up & QA of Linacs Date: Thu, 07 Dec 2000 07:48:29 -0800 From: "Leonard C. Johnson" Subject: Re: Morning run-up & QA of Linacs To: Cripps Steve Cc: Lynton-Moll Mary , "Linac Engineers List Server (E-mail)" Reply-to: lenj@CancerBoard.ab.ca Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT The radiation therapists do the morning run-ups and brief QA checks. If any problems are found then service is called. If any dosimetry related issues arise then a physicist is called. On Thu, 7 Dec. 2000 11:54:24 +1100 Cripps Steve wrote: > Hi list, I am seeking some feedback from other centres > about who does the morning run-up and morning QA checks on > your linac's. I am aware of some centres where this is done > by people other than radiation therapists - physicists, > engineers etc. What happens at your centre? > Thanks in advance for your help. > > Steve Cripps > Engineering Operations Manager > > Royal Hobart Hospital > Department of Radiation Oncology > (WP Holman Clinic) > GPO Box 1061L > Hobart 7001 > Australia > > Phone: > Switch 03 6223 4000 > Direct 03 6222 8618 > Fax 03 6234 8036 > Mobile 0408 136 906 > International +61 3 6223 4000 > ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Morning run-up & QA of Linacs Date: Thu, 07 Dec 2000 04:17:58 -0800 From: David Price Subject: Re: Morning run-up & QA of Linacs To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT At UF the engineers do the D1 values once a week on all the multi energy linacs, plus scan all linac for flatness/symitry and the therapist do all Ratio values all treatment equipment Any D1 or ratio spec problems are turned over to Physics >From: Cripps Steve >Hi list, I am seeking some feedback from other centres about who does the >morning run-up and morning QA checks on your linac's. >I am aware of some centres where this is done by people other than >radiation David Price SHands Cancer Center 2000 SW archer Rd Gainesville Fla, 32610 W 352-395-0316 Opinions expressed here are entirely my own and do not constitute any affirmation from my employer, the University of Florida, or my pet gerbil, Herbie "Linac Engineers List Server (E-mail)" linac-eng@plato1.aristotle.net ____________________________________________________________________________ _________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Morning run-up & QA of Linacs Date: Thu, 07 Dec 2000 02:38:06 -0800 From: Robert Hutchings Subject: RE: Morning run-up & QA of Linacs To: 'Cripps Steve' , "Linac Engineers List Server (E-mail)" Cc: Lynton-Moll Mary Message-id: <5AC80C84EFA4D411B0D900104B50997B1592@GALILEO> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Steve In Norwich, UK. The electronics engineers run-up our old (ABB) units as it is quite a temperamental and involved process. Our Varian 600C is run up by the radiographers (those that use the unit) as it is straightforward and trouble free. We are currently equipping a new department with new machines and stipulated that all units must be capable of being easily run-up by the users. Regards Robert Robert Hutchings Technical Services Manager Radiotherapy Physics Norfolk & Norwich Hospital Norwich NR1 3SR UK Tel: +44(0)1603 286251 Email: rh@rpunn.org.uk Web Site: www.rpunn.org.uk -----Original Message----- From: Cripps Steve [SMTP:steve.cripps@dchs.tas.gov.au] Sent: 07 December 2000 00:54 To: Linac Engineers List Server (E-mail) Cc: Lynton-Moll Mary Subject: Morning run-up & QA of Linacs Hi list, I am seeking some feedback from other centres about who does the morning run-up and morning QA checks on your linac's. I am aware of some centres where this is done by people other than radiation therapists - physicists, engineers etc. What happens at your centre? Thanks in advance for your help. Steve Cripps Engineering Operations Manager Royal Hobart Hospital Department of Radiation Oncology (WP Holman Clinic) GPO Box 1061L Hobart 7001 Australia Phone: Switch 03 6223 4000 Direct 03 6222 8618 Fax 03 6234 8036 Mobile 0408 136 906 International +61 3 6223 4000 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Morning run-up & QA of Linacs Date: Wed, 06 Dec 2000 16:54:24 -0800 From: Cripps Steve Subject: Morning run-up & QA of Linacs To: "Linac Engineers List Server (E-mail)" Cc: Lynton-Moll Mary Message-id: <4064724DF431D31183EF00805F8BC6E2013BB115@exch.dchs.tas.gov.au> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi list, I am seeking some feedback from other centres about who does the morning run-up and morning QA checks on your linac's. I am aware of some centres where this is done by people other than radiation therapists - physicists, engineers etc. What happens at your centre? Thanks in advance for your help. Steve Cripps Engineering Operations Manager Royal Hobart Hospital Department of Radiation Oncology (WP Holman Clinic) GPO Box 1061L Hobart 7001 Australia Phone: Switch 03 6223 4000 Direct 03 6222 8618 Fax 03 6234 8036 Mobile 0408 136 906 International +61 3 6223 4000 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Used Equipment Date: Wed, 06 Dec 2000 12:13:57 -0800 From: PilotDaveR@cs.com Subject: Used Equipment To: Linac-eng@plato1.aristotle.net Message-id: <36.eddaad0.275ff805@cs.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT I'm looking for a used RAD-X lateral film viewer. I think the model # is SS MB200. Thanks in Advance. David email: PilotDaveR@cs.com --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Ximatron Date: Wed, 06 Dec 2000 06:29:12 -0800 From: Jeremy Yorke Subject: Ximatron To: 'LinacEng' Reply-to: yorkej@cbhc.ns.ca Message-id: <01C05F6F.61746340.yorkej@cbhc.ns.ca> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Good morning, I have a Ximatron, #790 with version 6.01 software. The problem is that as soon as I power on, (once the software boots) the couch long brake is released and I can not engage it. The long brake button on the couch does nothing. (stays lit) From what I can figure out, this brake signal is asserted by the DIO pcb in the industrial computer by switching the 24v from the brake. I have a DIO on order, but am looking for other ideas while I am waiting delivery. Right now I have 24v at the brake (couch floating) and can not engage it. I am also getting acc. faults that are not true, allowing no movement at all, the accessory controller pcb is not showing any faults, just an error box on the console monitor and the tray icon comes up. There are no trays installed and the switches are all ok. Thanks Jeremy Jeremy Yorke C.E.T. Electronics Technologist Cape Breton Cancer Center 1482 George Street Sydney, Nova Scotia B1P1P3 (902)567-8000 ext.2163 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Fire in Bunkers! Date: Wed, 06 Dec 2000 01:16:13 -0800 From: John Macmillan Subject: Fire in Bunkers! To: Linac Eng List Message-id: <001301c05f6a$26d2dfa0$af9801d4@physics> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Dear All Thanks for all your replies. We are still in discussion with the Fire Officer and Dept of Health on the final design of our linac bunker, but the information gratefully received from this list has helped. Thanks again John Macmillan Royal Shrewsbury Hospital UK --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Varian Cl-2100C Ver 3.0 Date: Tue, 05 Dec 2000 14:34:54 -0800 From: "Maddox, Jerry" Subject: RE: Varian Cl-2100C Ver 3.0 To: "Wilson, Jim" , "'Linac Bulletin Board Posting (E-mail) '" Message-id: <36298D09ED1AD311B4DC0008C7F4D4E103DFF925@phsexch6.partners.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Something must be shifting. Is this about the angle where the whole cable bunch shifts in the gantry center? Have seen a few bad wires, and some wires rubbed bare, which had problems only when a certain sequence of rotation occurred. Sounds more like it is right at the pot. I have had pinched ribbons behind the pot, with a bare spot developed. sure would be nice if they would stop and let you check without moving anything! -----Original Message----- From: Wilson, Jim To: Linac Bulletin Board Posting (E-mail) Sent: 12/5/00 11:18 AM Subject: RE: Varian Cl-2100C Ver 3.0 We do not have MLC, David. We were getting the hardware faults with Y2 at 12cm, Y1 at 11cm and the gantry rotating up from 56 towards 180. It was always with these settings. You could see the Y2 primary pot voltage dithering as you rotated the gantry up and through approx 150 then it would calm down. If you rotated the gantry back down and then up again, it would fail again in about the same place. A .1cm movement and then back in Y2 position would fix the problem and nothing I could do would bring it back. Only the techs could get the failure to occur, and I only got to actually see it in action once. -----Original Message----- From: David Price [mailto:roast_em@hotmail.com] Sent: Tuesday, December 05, 2000 3:47 AM To: JWilson3@providence.org Subject: RE: Varian Cl-2100C Ver 3.0 do you have a MLC on this system?? when do you get the hardware fualts?? we had a odd problem with hardware fualts, when looking at the error log, it said UJ2 was the problem, does this sound familar?? Regards David, from U of F >From: "Wilson, Jim" >To: "Linac Bulletin Board Posting (E-mail)" > >Subject: RE: Varian Cl-2100C Ver 3.0 >Date: Fri, 1 Dec 2000 15:47:31 -0800 > >I would like to respond back with a hearty thanks to all who responded to >my >inquiry about intermittent Y2 jaw HWFA interlocks. We dug into the >collimator and did our best to simulate the problem, but we were >unsuccessful. We did a lot of cable flexing, pot tapping, position changing >etc. After that, we no longer had the problem in the clinical setting. >After >a nice chat with Mr. Peter Vitali (thanks Peter) we decided to change the >wiring harness that goes to the Y pots. We have been operating error free >for about 2 weeks. I disassembled the old harness, expecting to find the >wiring in bad shape, especially where the cable curls up when the jaws are >moved. After stripping back the insulation, I found the wiring to be in >perfect order!?!?!?!? I am not going to argue with success! I will let you >know if this problem returns. Thanks again. > >-----Original Message----- >From: Wilson, Jim [mailto:JWilson3@providence.org] >Sent: Monday, November 13, 2000 8:08 PM >To: Linac Bulletin Board Posting (E-mail) >Subject: Varian Cl-2100C Ver 3.0 > > >We have a problem with our Y2 jaw position readout voltage. The therapists >have been complaining about intermittent "HWFA" interlocks. Today I was >able >to actually see it do it and the readout voltage was fluctuating >significantly. The secondary voltage appeared to be stable. I would clear >the fault and move the gantry a few degrees either way and the interlock >would reappear. I did this several times and it was very repeatable. I then >moved the Y2 position .1 degree and back. I could then not recreate the >fault no matter what I did. They then proceeded to tell me that this >happens >after the treatment on this patient everyday as they are rotating the >gantry >from 56 to 180. I cannot duplicate this no matter how closely I follow >their >setup!!!!! > >1. Has anybody seen this? I was suspecting a gantry windup cable at first >until I made the small movement of the jaw and it became rock solid. It >fluctuated by at least a volt (service mode). I have thoroughly checked the >local wiring to the pot. >2. If I have to replace the potentiometer, do I have to remove the whole >motor drive assembly to do it?? Any tips on this?? > >Thanks in advance!! ________________________________________________________________________ ____ _________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Varian Cl-2100C Ver 3.0 Date: Tue, 05 Dec 2000 14:34:54 -0800 From: "Maddox, Jerry" Subject: RE: Varian Cl-2100C Ver 3.0 To: "Wilson, Jim" , "'Linac Bulletin Board Posting (E-mail) '" Message-id: <36298D09ED1AD311B4DC0008C7F4D4E103DFF925@phsexch6.partners.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Something must be shifting. Is this about the angle where the whole cable bunch shifts in the gantry center? Have seen a few bad wires, and some wires rubbed bare, which had problems only when a certain sequence of rotation occurred. Sounds more like it is right at the pot. I have had pinched ribbons behind the pot, with a bare spot developed. sure would be nice if they would stop and let you check without moving anything! -----Original Message----- From: Wilson, Jim To: Linac Bulletin Board Posting (E-mail) Sent: 12/5/00 11:18 AM Subject: RE: Varian Cl-2100C Ver 3.0 We do not have MLC, David. We were getting the hardware faults with Y2 at 12cm, Y1 at 11cm and the gantry rotating up from 56 towards 180. It was always with these settings. You could see the Y2 primary pot voltage dithering as you rotated the gantry up and through approx 150 then it would calm down. If you rotated the gantry back down and then up again, it would fail again in about the same place. A .1cm movement and then back in Y2 position would fix the problem and nothing I could do would bring it back. Only the techs could get the failure to occur, and I only got to actually see it in action once. -----Original Message----- From: David Price [mailto:roast_em@hotmail.com] Sent: Tuesday, December 05, 2000 3:47 AM To: JWilson3@providence.org Subject: RE: Varian Cl-2100C Ver 3.0 do you have a MLC on this system?? when do you get the hardware fualts?? we had a odd problem with hardware fualts, when looking at the error log, it said UJ2 was the problem, does this sound familar?? Regards David, from U of F >From: "Wilson, Jim" >To: "Linac Bulletin Board Posting (E-mail)" > >Subject: RE: Varian Cl-2100C Ver 3.0 >Date: Fri, 1 Dec 2000 15:47:31 -0800 > >I would like to respond back with a hearty thanks to all who responded to >my >inquiry about intermittent Y2 jaw HWFA interlocks. We dug into the >collimator and did our best to simulate the problem, but we were >unsuccessful. We did a lot of cable flexing, pot tapping, position changing >etc. After that, we no longer had the problem in the clinical setting. >After >a nice chat with Mr. Peter Vitali (thanks Peter) we decided to change the >wiring harness that goes to the Y pots. We have been operating error free >for about 2 weeks. I disassembled the old harness, expecting to find the >wiring in bad shape, especially where the cable curls up when the jaws are >moved. After stripping back the insulation, I found the wiring to be in >perfect order!?!?!?!? I am not going to argue with success! I will let you >know if this problem returns. Thanks again. > >-----Original Message----- >From: Wilson, Jim [mailto:JWilson3@providence.org] >Sent: Monday, November 13, 2000 8:08 PM >To: Linac Bulletin Board Posting (E-mail) >Subject: Varian Cl-2100C Ver 3.0 > > >We have a problem with our Y2 jaw position readout voltage. The therapists >have been complaining about intermittent "HWFA" interlocks. Today I was >able >to actually see it do it and the readout voltage was fluctuating >significantly. The secondary voltage appeared to be stable. I would clear >the fault and move the gantry a few degrees either way and the interlock >would reappear. I did this several times and it was very repeatable. I then >moved the Y2 position .1 degree and back. I could then not recreate the >fault no matter what I did. They then proceeded to tell me that this >happens >after the treatment on this patient everyday as they are rotating the >gantry >from 56 to 180. I cannot duplicate this no matter how closely I follow >their >setup!!!!! > >1. Has anybody seen this? I was suspecting a gantry windup cable at first >until I made the small movement of the jaw and it became rock solid. It >fluctuated by at least a volt (service mode). I have thoroughly checked the >local wiring to the pot. >2. If I have to replace the potentiometer, do I have to remove the whole >motor drive assembly to do it?? Any tips on this?? > >Thanks in advance!! ________________________________________________________________________ ____ _________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Varion 2100C/D, w/MLC and Impac Date: Tue, 05 Dec 2000 09:34:51 -0800 From: Larry Crowley Subject: Varion 2100C/D, w/MLC and Impac To: linac-eng@plato1.aristotle.net Message-id: <3A2D273B.1B21648D@concentric.net> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hello and best wishes to all When I attended a TM class at Varian for the Millennium MLC (March of 2000) we discussed some problems when utilizing Impac instead of Varis. Can anyone share any information relating to this situation as it exists today. Thank you in advance Larry Crowley, BS, CRES Physics Associate, Radiation Oncology MidMichigan Medical Center LDC3@concentric.net --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Varian Cl-2100C Ver 3.0 Date: Tue, 05 Dec 2000 08:18:04 -0800 From: "Wilson, Jim" Subject: RE: Varian Cl-2100C Ver 3.0 To: "Linac Bulletin Board Posting (E-mail)" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT We do not have MLC, David. We were getting the hardware faults with Y2 at 12cm, Y1 at 11cm and the gantry rotating up from 56 towards 180. It was always with these settings. You could see the Y2 primary pot voltage dithering as you rotated the gantry up and through approx 150 then it would calm down. If you rotated the gantry back down and then up again, it would fail again in about the same place. A .1cm movement and then back in Y2 position would fix the problem and nothing I could do would bring it back. Only the techs could get the failure to occur, and I only got to actually see it in action once. -----Original Message----- From: David Price [mailto:roast_em@hotmail.com] Sent: Tuesday, December 05, 2000 3:47 AM To: JWilson3@providence.org Subject: RE: Varian Cl-2100C Ver 3.0 do you have a MLC on this system?? when do you get the hardware fualts?? we had a odd problem with hardware fualts, when looking at the error log, it said UJ2 was the problem, does this sound familar?? Regards David, from U of F >From: "Wilson, Jim" >To: "Linac Bulletin Board Posting (E-mail)" > >Subject: RE: Varian Cl-2100C Ver 3.0 >Date: Fri, 1 Dec 2000 15:47:31 -0800 > >I would like to respond back with a hearty thanks to all who responded to >my >inquiry about intermittent Y2 jaw HWFA interlocks. We dug into the >collimator and did our best to simulate the problem, but we were >unsuccessful. We did a lot of cable flexing, pot tapping, position changing >etc. After that, we no longer had the problem in the clinical setting. >After >a nice chat with Mr. Peter Vitali (thanks Peter) we decided to change the >wiring harness that goes to the Y pots. We have been operating error free >for about 2 weeks. I disassembled the old harness, expecting to find the >wiring in bad shape, especially where the cable curls up when the jaws are >moved. After stripping back the insulation, I found the wiring to be in >perfect order!?!?!?!? I am not going to argue with success! I will let you >know if this problem returns. Thanks again. > >-----Original Message----- >From: Wilson, Jim [mailto:JWilson3@providence.org] >Sent: Monday, November 13, 2000 8:08 PM >To: Linac Bulletin Board Posting (E-mail) >Subject: Varian Cl-2100C Ver 3.0 > > >We have a problem with our Y2 jaw position readout voltage. The therapists >have been complaining about intermittent "HWFA" interlocks. Today I was >able >to actually see it do it and the readout voltage was fluctuating >significantly. The secondary voltage appeared to be stable. I would clear >the fault and move the gantry a few degrees either way and the interlock >would reappear. I did this several times and it was very repeatable. I then >moved the Y2 position .1 degree and back. I could then not recreate the >fault no matter what I did. They then proceeded to tell me that this >happens >after the treatment on this patient everyday as they are rotating the >gantry >from 56 to 180. I cannot duplicate this no matter how closely I follow >their >setup!!!!! > >1. Has anybody seen this? I was suspecting a gantry windup cable at first >until I made the small movement of the jaw and it became rock solid. It >fluctuated by at least a volt (service mode). I have thoroughly checked the >local wiring to the pot. >2. If I have to replace the potentiometer, do I have to remove the whole >motor drive assembly to do it?? Any tips on this?? > >Thanks in advance!! ____________________________________________________________________________ _________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Mevatron Reticule Date: Tue, 05 Dec 2000 07:40:31 -0800 From: Ken Allen Subject: Mevatron Reticule To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hello everyone, We have a Siemens MD2 Mevatron approx 9 yrs old and we're looking for a source for a retic plate. The original is quite yellowed and looking rough. The Siemens part no is 8505695 for the whole assy and the acrylic plate part no is 8497752B. Any advice or sources would be appreciated. Ken Allen Nuclear Electronics CancerCare Manitoba 675 McDermot Ave Winnipeg, MB, Canada R3E 0V9 204-787-2192 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: 2300c/d underdose Date: Tue, 05 Dec 2000 07:00:07 -0800 From: "Turner, Guy" Subject: RE: 2300c/d underdose To: "'Moore, Lee'" , "'Linac-Eng@plato1.aristotle.net'" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Lee, Is this problem unique to only 6X? Guy Turner, Ext. 6247 Radiation Service Engineer Information Security Manager "Any Enterprise When Fairly Once Begun Should Not Be Left Until All That Ought Is Won" PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or legally effective electronic signature. (2) this message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify us, disregard the foregoing message, and delete the message immediately. We apologize for any inconvenience this may have caused. > -----Original Message----- > From: Moore, Lee [SMTP:lmoore@sjha.org] > Sent: Tuesday, December 05, 2000 7:20 AM > To: 'Linac-Eng@plato1.aristotle.net' > Subject: 2300c/d underdose > > I have a 2300 c/d serial#123 will a slight problem. I am getting > underdose > faults rather quickly in 6mv with gantry at 90 degrees. All is well in > all > other angles. Any suggestions. Thanks(fyi---exchanged all hoses in > system > last Thursday-don't know if related in any way) --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: 2300c/d underdose Date: Tue, 05 Dec 2000 05:20:15 -0800 From: "Moore, Lee" Subject: 2300c/d underdose To: "'Linac-Eng@plato1.aristotle.net'" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT I have a 2300 c/d serial#123 will a slight problem. I am getting underdose faults rather quickly in 6mv with gantry at 90 degrees. All is well in all other angles. Any suggestions. Thanks(fyi---exchanged all hoses in system last Thursday-don't know if related in any way) --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Varian Cl-2100C Ver 3.0 Date: Tue, 05 Dec 2000 03:46:37 -0800 From: David Price Subject: RE: Varian Cl-2100C Ver 3.0 To: "Wilson, Jim" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT do you have a MLC on this system?? when do you get the hardware fualts?? we had a odd problem with hardware fualts, when looking at the error log, it said UJ2 was the problem, does this sound familar?? Regards David, from U of F >From: "Wilson, Jim" >To: "Linac Bulletin Board Posting (E-mail)" > >Subject: RE: Varian Cl-2100C Ver 3.0 >Date: Fri, 1 Dec 2000 15:47:31 -0800 > >I would like to respond back with a hearty thanks to all who responded to >my >inquiry about intermittent Y2 jaw HWFA interlocks. We dug into the >collimator and did our best to simulate the problem, but we were >unsuccessful. We did a lot of cable flexing, pot tapping, position changing >etc. After that, we no longer had the problem in the clinical setting. >After >a nice chat with Mr. Peter Vitali (thanks Peter) we decided to change the >wiring harness that goes to the Y pots. We have been operating error free >for about 2 weeks. I disassembled the old harness, expecting to find the >wiring in bad shape, especially where the cable curls up when the jaws are >moved. After stripping back the insulation, I found the wiring to be in >perfect order!?!?!?!? I am not going to argue with success! I will let you >know if this problem returns. Thanks again. > >-----Original Message----- >From: Wilson, Jim [mailto:JWilson3@providence.org] >Sent: Monday, November 13, 2000 8:08 PM >To: Linac Bulletin Board Posting (E-mail) >Subject: Varian Cl-2100C Ver 3.0 > > >We have a problem with our Y2 jaw position readout voltage. The therapists >have been complaining about intermittent "HWFA" interlocks. Today I was >able >to actually see it do it and the readout voltage was fluctuating >significantly. The secondary voltage appeared to be stable. I would clear >the fault and move the gantry a few degrees either way and the interlock >would reappear. I did this several times and it was very repeatable. I then >moved the Y2 position .1 degree and back. I could then not recreate the >fault no matter what I did. They then proceeded to tell me that this >happens >after the treatment on this patient everyday as they are rotating the >gantry >from 56 to 180. I cannot duplicate this no matter how closely I follow >their >setup!!!!! > >1. Has anybody seen this? I was suspecting a gantry windup cable at first >until I made the small movement of the jaw and it became rock solid. It >fluctuated by at least a volt (service mode). I have thoroughly checked the >local wiring to the pot. >2. If I have to replace the potentiometer, do I have to remove the whole >motor drive assembly to do it?? Any tips on this?? > >Thanks in advance!! ____________________________________________________________________________ _________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Position vacant Launceston Australia Date: Mon, 04 Dec 2000 14:49:30 -0800 From: Russell Watson Subject: Position vacant Launceston Australia To: "'davep@chhlth.gov.nz'" Cc: "'linac-eng@plato1.aristotle.net'" Reply-to: russell.watson@dchs.tas.gov.au Message-id: <01C05EA0.AAA08A00.rwatson@postofficen.dchs.tas.gov.au> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT . >>> Hospitals & Ambulance Service Launceston General Hospital Engineering Operations Manager (SSP No 503821) Applications Close:- Friday, 15 December 2000. Salary:- $46,948 per annum. Permanent, full-time, day work. Technical Stream, Level 5. Location:- Holman Clinic - Engineering Section, Launceston. Duties:- To manage the Radiation Engineering services of the W P Holman Clinic, Launceston and provide Radiation Engineering Services to the Department of Radiation Oncology at the Royal Hobart Hospital as required. Essential Requirements:- An associate diploma from a recognised TAFE institution, or an equivalent qualification appropriate to the nature of the work; or relevant training and/or experience determined in accordance with the provisions of Section 37 of the Tasmanian State Service Act 1984 appropriate to the nature of the work. Desirable Requirements:- A high degree of technical skill and experience in performing breakdown repair of electronic, mechanical, electro-mechanical, high vacuum and water cooling systems. High level communication and interpersonal relationship skills. Completion or substantial progress toward a relevant tertiary qualification in engineering or technology. Please note: to be considered for an interview an applicant must address in writing each of the selection criteria and position requirements, which are contained in the position description. Position descriptions may be requested by leaving a message on telephone (03) 6233 3700 or by e-mail dhhs.pd@dchs.tas.gov.au. Enquiries to Grant Smith on telephone 6348 7140. Applicants are requested to supply three copies of their application to Recruitment Unit, Human Resources Services, Department of Health and Human Services, GPO Box 125, Hobart 7001, email dhhs.recruitment @dchs.tas.gov.au or fax (03) 6233 3845. --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Major Linac Failures Date: Mon, 04 Dec 2000 10:23:31 -0800 From: Dave Pinchin Subject: Re: Major Linac Failures To: Cripps Steve , linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT G'day, Another serious consideration is the add on upgrades themselves. The old machines were not designed with PV and MLC in mind and adding them onto an old machine will not result in a tidy, easily serviced unit. Dave. >>> Cripps Steve 4/12/00 19:59:35 >>> We are at present going through the process of deciding whether to replace our 2100C with a new machine or to proceed with a major upgrade (MLC, PV etc etc). Our 2100C S/N 14 is now 12 years old and we have no manufacturer's service contract support. The risk we take with a major upgrade would of course be the risk of a major failure (bend magnet, waveguide etc). Does anyone have any information on major failures for machines greater than 10 - 12 years old. Personal experience would be great but a statistical analysis would obviously be best - if it exists. Thanks in advance. Steve Cripps Engineering Operations Manager Royal Hobart Hospital Department of Radiation Oncology (WP Holman Clinic) GPO Box 1061L Hobart 7001 Tasmania Australia Phone: Switch 03 6223 4000 Direct 03 6222 8618 Fax 03 6234 8036 Mobile 0408 136 906 International +61 3 6223 4000 This email or attachment(s) may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury Health Ltd. --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Varian Cl-2100C Ver 3.0 Date: Mon, 04 Dec 2000 08:36:00 -0800 From: "Maddox, Jerry" Subject: RE: Varian Cl-2100C Ver 3.0 To: "Wilson, Jim" Message-id: <36298D09ED1AD311B4DC0008C7F4D4E103DFF922@phsexch6.partners.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT some time ago there was a lot of discussion on the famous y2 hwfa problems, with lots of mechanical adjustment info. Good to find this if you can. > -----Original Message----- > From: Wilson, Jim [SMTP:JWilson3@providence.org] > Sent: Friday, December 01, 2000 6:48 PM > To: Linac Bulletin Board Posting (E-mail) > Subject: RE: Varian Cl-2100C Ver 3.0 > > I would like to respond back with a hearty thanks to all who responded to my > inquiry about intermittent Y2 jaw HWFA interlocks. We dug into the > collimator and did our best to simulate the problem, but we were > unsuccessful. We did a lot of cable flexing, pot tapping, position changing > etc. After that, we no longer had the problem in the clinical setting. After > a nice chat with Mr. Peter Vitali (thanks Peter) we decided to change the > wiring harness that goes to the Y pots. We have been operating error free > for about 2 weeks. I disassembled the old harness, expecting to find the > wiring in bad shape, especially where the cable curls up when the jaws are > moved. After stripping back the insulation, I found the wiring to be in > perfect order!?!?!?!? I am not going to argue with success! I will let you > know if this problem returns. Thanks again. > > -----Original Message----- > From: Wilson, Jim [mailto:JWilson3@providence.org] > Sent: Monday, November 13, 2000 8:08 PM > To: Linac Bulletin Board Posting (E-mail) > Subject: Varian Cl-2100C Ver 3.0 > > > We have a problem with our Y2 jaw position readout voltage. The therapists > have been complaining about intermittent "HWFA" interlocks. Today I was able > to actually see it do it and the readout voltage was fluctuating > significantly. The secondary voltage appeared to be stable. I would clear > the fault and move the gantry a few degrees either way and the interlock > would reappear. I did this several times and it was very repeatable. I then > moved the Y2 position .1 degree and back. I could then not recreate the > fault no matter what I did. They then proceeded to tell me that this happens > after the treatment on this patient everyday as they are rotating the gantry > from 56 to 180. I cannot duplicate this no matter how closely I follow their > setup!!!!! > > 1. Has anybody seen this? I was suspecting a gantry windup cable at first > until I made the small movement of the jaw and it became rock solid. It > fluctuated by at least a volt (service mode). I have thoroughly checked the > local wiring to the pot. > 2. If I have to replace the potentiometer, do I have to remove the whole > motor drive assembly to do it?? Any tips on this?? > > Thanks in advance!! --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Major Linac Failures Date: Mon, 04 Dec 2000 06:47:43 -0800 From: "Turner, Guy" Subject: RE: Major Linac Failures To: 'Cripps Steve' , "Linac Engineers List Server (E-mail)" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Steve, All anyone can do in this situation is make an educated guess, really. If this machine has had no major failures to this point it is only a matter of time before you have one. You are probably going to have to replace this machine in another 3 to 5 years tops anyway. If it were me making the decision I would recommend purchasing a new machine now. The upgrades you are talking about are too expensive to put on a 12 year old machine. Statistically speaking I would feel confident in saying that the odds are that you will have many problems with the unit after the upgrade and the guys that control the purse strings with think someone made a bad decision. Guy Turner, Ext. 6247 Radiation Service Engineer Information Security Manager "Any Enterprise When Fairly Once Begun Should Not Be Left Until All That Ought Is Won" PLEASE NOTE: (1) the foregoing is not intended to be a legally binding or legally effective electronic signature. (2) this message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify us, disregard the foregoing message, and delete the message immediately. We apologize for any inconvenience this may have caused. > -----Original Message----- > From: Cripps Steve [SMTP:steve.cripps@dchs.tas.gov.au] > Sent: Monday, December 04, 2000 1:00 AM > To: Linac Engineers List Server (E-mail) > Subject: Major Linac Failures > > We are at present going through the process of deciding whether to replace > our 2100C with a new machine or to proceed with a major upgrade (MLC, PV > etc > etc). > > Our 2100C S/N 14 is now 12 years old and we have no manufacturer's service > contract support. The risk we take with a major upgrade would of course be > the risk of a major failure (bend magnet, waveguide etc). > > Does anyone have any information on major failures for machines greater > than > 10 - 12 years old. Personal experience would be great but a statistical > analysis would obviously be best - if it exists. > Thanks in advance. > > Steve Cripps > Engineering Operations Manager > > Royal Hobart Hospital > Department of Radiation Oncology > (WP Holman Clinic) > GPO Box 1061L > Hobart 7001 > Tasmania > Australia > > Phone: > Switch 03 6223 4000 > Direct 03 6222 8618 > Fax 03 6234 8036 > Mobile 0408 136 906 > International +61 3 6223 4000 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Major Linac Failures Date: Sun, 03 Dec 2000 22:59:35 -0800 From: Cripps Steve Subject: Major Linac Failures To: "Linac Engineers List Server (E-mail)" Message-id: <4064724DF431D31183EF00805F8BC6E2013BB10D@exch.dchs.tas.gov.au> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT We are at present going through the process of deciding whether to replace our 2100C with a new machine or to proceed with a major upgrade (MLC, PV etc etc). Our 2100C S/N 14 is now 12 years old and we have no manufacturer's service contract support. The risk we take with a major upgrade would of course be the risk of a major failure (bend magnet, waveguide etc). Does anyone have any information on major failures for machines greater than 10 - 12 years old. Personal experience would be great but a statistical analysis would obviously be best - if it exists. Thanks in advance. Steve Cripps Engineering Operations Manager Royal Hobart Hospital Department of Radiation Oncology (WP Holman Clinic) GPO Box 1061L Hobart 7001 Tasmania Australia Phone: Switch 03 6223 4000 Direct 03 6222 8618 Fax 03 6234 8036 Mobile 0408 136 906 International +61 3 6223 4000 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Varian Cl-2100C Ver 3.0 Date: Sat, 02 Dec 2000 05:51:24 -0800 From: Ronnie Relyea Subject: RE: Varian Cl-2100C Ver 3.0 To: "Wilson, Jim" Message-id: <20001202135124.367.qmail@web112.yahoomail.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Jim, I'm happy to hear your fixed. Whenever I'v experienced HWFA's and I determine the jaw doesn't have exessive slop, I end up replacing both the primary and secondary readout pots. Gantry angle will kick off a HWFA if you'v got a bad pot believe it or not. Just a heads up in case it rears its ugly head again. Ron Relyea "Wilson, Jim" wrote: > I would like to respond back with a hearty thanks to > all who responded to my > inquiry about intermittent Y2 jaw HWFA interlocks. > We dug into the > collimator and did our best to simulate the problem, > but we were > unsuccessful. We did a lot of cable flexing, pot > tapping, position changing > etc. After that, we no longer had the problem in the > clinical setting. After > a nice chat with Mr. Peter Vitali (thanks Peter) we > decided to change the > wiring harness that goes to the Y pots. We have been > operating error free > for about 2 weeks. I disassembled the old harness, > expecting to find the > wiring in bad shape, especially where the cable > curls up when the jaws are > moved. After stripping back the insulation, I found > the wiring to be in > perfect order!?!?!?!? I am not going to argue with > success! I will let you > know if this problem returns. Thanks again. > > -----Original Message----- > From: Wilson, Jim [mailto:JWilson3@providence.org] > Sent: Monday, November 13, 2000 8:08 PM > To: Linac Bulletin Board Posting (E-mail) > Subject: Varian Cl-2100C Ver 3.0 > > > We have a problem with our Y2 jaw position readout > voltage. The therapists > have been complaining about intermittent "HWFA" > interlocks. Today I was able > to actually see it do it and the readout voltage was > fluctuating > significantly. The secondary voltage appeared to be > stable. I would clear > the fault and move the gantry a few degrees either > way and the interlock > would reappear. I did this several times and it was > very repeatable. I then > moved the Y2 position .1 degree and back. I could > then not recreate the > fault no matter what I did. They then proceeded to > tell me that this happens > after the treatment on this patient everyday as they > are rotating the gantry > from 56 to 180. I cannot duplicate this no matter > how closely I follow their > setup!!!!! > > 1. Has anybody seen this? I was suspecting a gantry > windup cable at first > until I made the small movement of the jaw and it > became rock solid. It > fluctuated by at least a volt (service mode). I have > thoroughly checked the > local wiring to the pot. > 2. If I have to replace the potentiometer, do I have > to remove the whole > motor drive assembly to do it?? Any tips on this?? > > Thanks in advance!! __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Varian Cl-2100C Ver 3.0 Date: Fri, 01 Dec 2000 16:32:56 -0800 From: Steve Reliford Subject: RE: Varian Cl-2100C Ver 3.0 To: "Wilson, Jim" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT I will be on vacation until Monday, December 4. Please contact Dave Huffman if you have an urgent request. Otherwise, I'll check my inbox upon my return and respond as necessary. Thanks, Steve --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Varian Cl-2100C Ver 3.0 Date: Fri, 01 Dec 2000 15:47:31 -0800 From: "Wilson, Jim" Subject: RE: Varian Cl-2100C Ver 3.0 To: "Linac Bulletin Board Posting (E-mail)" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT I would like to respond back with a hearty thanks to all who responded to my inquiry about intermittent Y2 jaw HWFA interlocks. We dug into the collimator and did our best to simulate the problem, but we were unsuccessful. We did a lot of cable flexing, pot tapping, position changing etc. After that, we no longer had the problem in the clinical setting. After a nice chat with Mr. Peter Vitali (thanks Peter) we decided to change the wiring harness that goes to the Y pots. We have been operating error free for about 2 weeks. I disassembled the old harness, expecting to find the wiring in bad shape, especially where the cable curls up when the jaws are moved. After stripping back the insulation, I found the wiring to be in perfect order!?!?!?!? I am not going to argue with success! I will let you know if this problem returns. Thanks again. -----Original Message----- From: Wilson, Jim [mailto:JWilson3@providence.org] Sent: Monday, November 13, 2000 8:08 PM To: Linac Bulletin Board Posting (E-mail) Subject: Varian Cl-2100C Ver 3.0 We have a problem with our Y2 jaw position readout voltage. The therapists have been complaining about intermittent "HWFA" interlocks. Today I was able to actually see it do it and the readout voltage was fluctuating significantly. The secondary voltage appeared to be stable. I would clear the fault and move the gantry a few degrees either way and the interlock would reappear. I did this several times and it was very repeatable. I then moved the Y2 position .1 degree and back. I could then not recreate the fault no matter what I did. They then proceeded to tell me that this happens after the treatment on this patient everyday as they are rotating the gantry from 56 to 180. I cannot duplicate this no matter how closely I follow their setup!!!!! 1. Has anybody seen this? I was suspecting a gantry windup cable at first until I made the small movement of the jaw and it became rock solid. It fluctuated by at least a volt (service mode). I have thoroughly checked the local wiring to the pot. 2. If I have to replace the potentiometer, do I have to remove the whole motor drive assembly to do it?? Any tips on this?? Thanks in advance!! --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: SV: 600C Communications error Date: Fri, 01 Dec 2000 06:58:01 -0800 From: Viking Eilert Subject: SV: 600C Communications error To: GARRYANGEL@aol.com Cc: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 8BIT Hello Garry I'm not sure if it the same problem but we have had a simular problem som time ago. I send you a copy of the response I got then. Our problem was probably the +5V power supply in the console rack and/or the communication and control microprocessor PCB that BOTH has to be of a new Vendor revision number above 017. You got the deatails futher down in this mail. Good Luck Please let us know if you succed. Eilert aaaaaaaaaaaaaaaa Eilert, We are having the same problem with one of our 2100C's. We are running 5.2 so it is probably not the software.We performed the first step of the upgrade ourselves, which involved changing the PC's and making them run with current revision. No problems for 6 weeks until last Friday. We are experiencing the same exact symptoms on the 2100. I, going to swap out the dell GX1 and see if the problem disappears. Arlie Grills BJC Health Systems Barnes Hospital St. Louis Mo. aaaaaaaaaaaaaaaaaaaaa Hi Eilert, I've had configuation errors similar to Communication failed reading firmware version - data 24 (or data 26) when the hard disk has been dodgy. Can you run some disk diagnostics? Possibly repeatedly. A flakey disk may not show up immediately as your problem is intermittent. Regards Terry Keary aaaaaaaaaaaaaaaaaaa Sorry this is so late. The problem could well be related to the serial port of the DELL. We had one (I can't remember which breed of machine) the was RS232ing at 0.96 Baud instead of 9600. Of course as long as the data is sent or no data errors detected then there were NO errors displayed except 'no comms'. It's also worth checking the cable as that will have been played with (D25 changed to D9 ?????). Good luck. Dave. aaaaaaaaaaaaaaaaaaaa Viking, take a look at the CNF files to see if they all updated during the install. I would also check the cable from the Comm to the PC. It would seem if this had a bad wire it would be bad all the time, or you could flex it to make your problem appear, but it is still worth checking. I have had weird problems with the Dells, but the problems have almost always been immediate or within a short time after installation. Bad out of the box you might say. The Dell is what I would suspect the most. Easily confirmed by having Varian send another in. Good Luck aaaaaaaaaaaaaaaaaaaaaaaaaa Hej Viking We had a problem similar to yours soon after we did the same upgrade to our 2100C No320. And since the problem was linac age related perhaps our story would give you a clue. The problem on ours was that the upgrade disturbed the cards in the control rack (the box into which the new PC almost fits). This either allowed the ingress of dirt or just degraded the continuity in the plug/socket/edge connector connections in that rack. Our solution was to pull each of the cards out in turn and clean all edge connectors, plugs and sockets with fluid. We have not had a fault of this sort since. Another possibility would be damaged ribbon cables or connectors. Good Luck Robert Chambers, Medical Physicist, Andrew Love Cancer Centre, Geelong, Victoria, Australia. aaaaaaaaaaaaaaaaaa Hello, Your local Varian office should give you an answer for this. It should be under warranty. On the Comm sync PCB there is a jumper that could have been change during the mod. This jumper selects between the new and old talk. Mainly for the Dynamic MLC option. If out of position it could cause this problem. But contact Varian and demand they help you. I used to work for them. At your service Vince aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa Hi! Check the socket between the Control and Comm Computer boards. This is the slot normally occupied by the DSYNC board mounted on the Control Computer. There should be only one socket and it should have a priority chain jumper board. My guess is that after replacing the program EPROM on the Control Computer, whoever did it put the board back in the wrong socket. This has happened before, and the symptoms are exactly as you describe them. I speak only for myself and not for Varian Medical Systems. Bill Kirkness C-series Guy aaaaaaaaaaaaaaaaaaaa -----Original Message----- From: Viking Eilert [mailto:Eilert.Viking@lio.se] Sent: Friday, August 06, 1999 02:07 AM To: Linac-Eng (E-post) Cc: Torben Larsen (E-post); Tommie Jeppesen (E-post); Tom Robins (E-post); William Kirkness (E-post) Subject: communication error Clinac 2100C Hello linac list. We have a Clinac 2100C #248. It was upgraded to version 5,4 and at the same time Varian replaced the IBM PC to a pentium Dell optiplex. Ever since we have had communication error which locks the Dell PC approximately once a day (some times maybe five times a day and outer times maybe not for a couple of days). We havn't noticed any particular times when the error occour. Rather often it happens during the nights when the machine is in standby. The only way to solve the problem is to reset the STD bus (or shutting the machine off and on), then it works fine for a while. Our local Varian office doesn't know what causes the problem. First they asked us to replace the communication and controller microprocessor PCB to a vendor revision number 17 or above. We replaced them but it didn't help. Could it be the Dell PC or the security module on the printer port of the PC? We have know replaced all the PCB (beside the ADC, which we will replace) in the STD bus without any luck. Have anyone of you out there on the list heard of a simular problem or have any suggestions? Symptoms: 1. The LED on the control microprocessor PCB always shows 01 hex, digital output read back failure. 2. The LED on the communication microprocessor PCB is ok (FF hex). 3. No info is stored in the Event log file. 4. If you reboot the Dell PC (when you have the comm error) it sometimes shows on the screen: Installed versions 5,4,05 console software 1102194-10, comm software 01x*+0§/&=?...... (or some other rubbish characters), incorrect comm firmware installed, incorrect controller firmware installed. or Communication failed reading firmware version - data 24 (or data 26) 5. No communication is possible from the machine to the Dell PC. We have tried to look in service mode at the hex codes in the common RAM, but I don't know if it have any relevant information because of the lack of proper communication. The hex codes for shows F1 or FD (should be 01 ?) and the shows F1 or FF. Thank you Eilert Viking Universitetssjukhuset i Linköping Eilert Viking O-centrum telefon: +46-13 222805 Radiofysikavdelningen fax: +46-13 222895 Sjukhusfysik Eilert.Viking@lio.se S-581 85 Linköping Sweden telefon: +46-13 222000 aaaaaaaaaaaaaaaaaa > -----Ursprungligt meddelande----- > Från: GARRYANGEL@aol.com [SMTP:GARRYANGEL@aol.com] > Skickat: den 14 november 2000 21:04 > Till: linac-eng@plato1.aristotle.net > Ämne: Re: 600C Communications error > > Hi Everyone ... I have a 600C (serial #8x) that's experiencing > intermittent communications errors. This mostly occurs at turn on in the > morning and occasionally during the treatment day. I have been told that > this id due to the software upgrade to (ver 6.X ) which was performed some > 6 months ago. I've also been told that there are certain P.C.B. version > requirements, etc. > > I would appreciate any comments or suggestions. Thanks in advance!! > > Garry > --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Fires in Bunkers! Date: Wed, 29 Nov 2000 06:46:47 -0800 From: tcullen@wfubmc.edu Subject: Re: Fires in Bunkers! To: Amanda Pemberton Cc: Linac Eng List Message-id: <3A2516D7.ACB4F5E@wfubmc.edu> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Amanda&John, I've seen components "smoke" on the linacs but never an all out flaming fire. Not to say they could not cause a fire, but I've never seen this happen. My suggestion would be to not go with an automatic type of extinguishing system. The old fashion fire extinguisher located at the entrance would suffice and most facilities have an automatic HVAC system (mechanical air handlers) in place already to isolate the room or area in the event of fire. We have a annual inservice on both linac safety and general safety in the department which includes fire emergencies. The linacs themselves are designed with emergency stops and can kill power to them in the event of a fire emergency, which in some cases will eliminate the source of combustion. A good guide to follow is the National Fire Protection Association codes and standards. They have covered almost every possible scenario as far as electrical hazards go. Good luck with your new linac. Amanda Pemberton wrote: > Dear All > > We are in the design stage of building a bunker for our new linac. > We are looking at fire safety due to a new directive from the Dept of Health > coming into force Apr 2001. > > Has anyone had: > > 1. Experience / know / have info of any fires in linac bunkers. > > 2. Problems with the evacuation of patients. > > I would appreciate your help. Please e-mail privately if preferred. > > Many Thanks > > John Macmillan > Radiotherapy Physics > Radiotherapy Dept. > Royal Shrewsbury Hospital > UK > 01743 261302 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Rad Onc. Jobs Date: Tue, 28 Nov 2000 13:33:01 -0800 From: THoran@comphealth.com Subject: Rad Onc. Jobs To: THoran@comphealth.com Message-id: <852569A5.00763844.08@ctnotes1.whcmail.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi, My name is Tom Horan. I am a recruiter with CompHealth, the nation's largest and most diversified healthcare staffing company. We provide permanent placement of physicists, dosimetrists, and radiation therapists to prominent healthcare institutions throughout the United States. We are currently recruiting for several excellent positions in radiation oncology. I am writing to you with the hope that you may be able to recommend someone who would be willing to relocate for a permanent position. Or, perhaps you might be interested? Please reply or call me at the toll free number listed below. Thank you! Tom Horan CompHealth Permanent Placement Division Tel: (800) 782-9029, x-749 Fax: (954) 489-9575 E-Mail: thoran@comphealth.com Website: www.comphealth.com --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: 600CD Yield Servo Date: Tue, 28 Nov 2000 12:39:38 -0800 From: "Feuerstake, Tom" Subject: RE: 600CD Yield Servo To: "Linac Engineers (E-mail)" Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT This can be an annoying problem, one that keeps coming back every so often, sometimes for different reasons. I've found that the setup of the AFC system is important if there seems to be a gantry angle dependence on the Yield. Check the RF sample gate pulse for correct timing. Any changes to the timing (due to Thyratron "jitter", for example) will have a negative effect on the Yield servo. We've also found that the magnetron tuner coupling can become loose, causing the drive motor to slip and give poor AFC response. That in turn can show itself as a yield servo before you notice any AFC error. Note Mr. Keith Croft's message on the effect of yield servo change is well founded! Tom Feuerstake PMH Toronto -----Original Message----- From: Keith Croft [SMTP:keith.croft@midcentral.co.nz] Sent: Tuesday, November 28, 2000 3:03 PM To: 'Linac eng' Subject: RE: 600CD Yield Servo If you adjust the yeild servo - I assume you also have checked the "horns", if not then you are also changing your patients treatment distributions too. I assume you have advised your physics guru's of this? Keith. -----Original Message----- From: K. Yeung [mailto:kimyeung@netvigator.com] Sent: Wednesday, November 29, 2000 4:58 AM To: linac-eng@plato1.aristotle.net Subject: Re: 600CD Yield Servo Hi Colleagues, I have to adjust the Yield Servo every two to three weeks in order to keep dose within tolerance, as the magnetron I was reduced by the yield servo. I had already adjusted phase wand and delay line. Could anyone give advice on this issue? Thanks in advance. Kim Yeung ###################################################################### Attention: This e-mail message and any attachments contain information that is confidential and may be subject to Legal and Medical privilege. If you are not the intended recipient, you must not peruse, use, pass on or copy this message or any attachments. If you have received this e-mail in error, please notify us by return e-mail and erase all copies of this message including any attachments. MidCentral Health does not accept any liability in respect of any virus which is not detected. This e-mail message has been scanned and cleared by MailMarshal ###################################################################### --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Motion Interlock Date: Tue, 28 Nov 2000 12:47:46 -0800 From: Randy Niccolls Subject: Re: Motion Interlock To: DaveP@chhlth.govt.nz, linac-eng@plato1.aristotle.net, oxiknox@yahoo.com Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT A noisey main thyratron or dequeing thyratron can cause motion faults. I would change the main thyratron first. We had this same problem two years ago and it was the main thyratron. Any views or opinions expressed in this email (unless otherwise stated) are mine and do not reflect the opinions or policies of any other person or organization. This email may contain personel or private information and the foregoing is not intended to be a legally binding or legally effective electronic signature. This message may contain legally privileged or confidential information. If you are not the intended recipient of this message, please notify me, disregard the foregoing message, and delete the message immediately. I apologize for any inconvenience this may have caused. >>> "Dave Pinchin" 11/28/00 12:28PM >>> G'day, Wasn't there a 'known' problem with some versions of the software where noise was getting into the A/D and causing this. I recall Varian's solution was to prevent the aquisitions within (x)ms of the beam pulse. If symptoms persist a S/W upgrade may be an option. Dave >>> Daryl Knox 29/11/00 02:26:55 >>> I hvae a 2100c sn# 301 that is giving motion faults on the couch longatudional. Pot has been changed when I discovered that it only happens with beam on and mostly in 15X. Ths D/O pcb has been changed and even the Klystron (Was at max fil and low in power anyway). The Kly timing has been changed and seems to help but still getting the fault. It seems to be noise. Any Ideas? Daryl Knox oxiknox@yahoo.com __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ This email or attachment(s) may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury Health Ltd. --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: 600CD Yield Servo Date: Tue, 28 Nov 2000 12:02:47 -0800 From: Keith Croft Subject: RE: 600CD Yield Servo To: 'Linac eng' Message-id: <00BE56E17E26D11197CB00805FA6803A023BBAF3@mail.midcentral.co.nz> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT If you adjust the yeild servo - I assume you also have checked the "horns", if not then you are also changing your patients treatment distributions too. I assume you have advised your physics guru's of this? Keith. -----Original Message----- From: K. Yeung [mailto:kimyeung@netvigator.com] Sent: Wednesday, November 29, 2000 4:58 AM To: linac-eng@plato1.aristotle.net Subject: Re: 600CD Yield Servo Hi Colleagues, I have to adjust the Yield Servo every two to three weeks in order to keep dose within tolerance, as the magnetron I was reduced by the yield servo. I had already adjusted phase wand and delay line. Could anyone give advice on this issue? Thanks in advance. Kim Yeung ###################################################################### Attention: This e-mail message and any attachments contain information that is confidential and may be subject to Legal and Medical privilege. If you are not the intended recipient, you must not peruse, use, pass on or copy this message or any attachments. If you have received this e-mail in error, please notify us by return e-mail and erase all copies of this message including any attachments. MidCentral Health does not accept any liability in respect of any virus which is not detected. This e-mail message has been scanned and cleared by MailMarshal ###################################################################### --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Motion Interlock Date: Tue, 28 Nov 2000 11:28:11 -0800 From: Dave Pinchin Subject: Re: Motion Interlock To: linac-eng@plato1.aristotle.net, Daryl Knox Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT G'day, Wasn't there a 'known' problem with some versions of the software where noise was getting into the A/D and causing this. I recall Varian's solution was to prevent the aquisitions within (x)ms of the beam pulse. If symptoms persist a S/W upgrade may be an option. Dave >>> Daryl Knox 29/11/00 02:26:55 >>> I hvae a 2100c sn# 301 that is giving motion faults on the couch longatudional. Pot has been changed when I discovered that it only happens with beam on and mostly in 15X. Ths D/O pcb has been changed and even the Klystron (Was at max fil and low in power anyway). The Kly timing has been changed and seems to help but still getting the fault. It seems to be noise. Any Ideas? Daryl Knox oxiknox@yahoo.com __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ This email or attachment(s) may contain confidential or legally privileged information intended for the sole use of the addressee(s). Any use, redistribution, disclosure, or reproduction of this message, except as intended, is prohibited. If you received this email in error, please notify the sender and remove all copies of the message, including any attachments. Any views or opinions expressed in this email (unless otherwise stated) may not represent those of Canterbury Health Ltd. --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Cl.2100 broken TARG-I wire Date: Tue, 28 Nov 2000 11:07:47 -0800 From: Randy Wick Subject: RE: Cl.2100 broken TARG-I wire To: 'Linac-eng list' Message-id: <6BAF4D075F07D411B30900508B94CBA03E542D@SERVER20> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT I have also had this problem. The Targ I signal is only for monitoring, but it is very useful. The wire attaches to the target block by a crimp connecter that is screwed to the target block. Once you detach it, it is not too hard to pull the cable back, re-terminate and then screw it back on. Randy Wick Fraser Valley Cancer Centre Surrey, BC, Canada -----Original Message----- From: CJ.de.Bruijne@walcheren.ziekenhuis.nl [ mailto:CJ.de.Bruijne@walcheren.ziekenhuis.nl ] Sent: Tuesday, November 28, 2000 6:41 AM To: linac-eng@plato1.aristotle.net Subject: Cl.2100 broken TARG-I wire Hi colleagues, We found in our Cl.2100 (C2) last friday a broken TARG-I wire. It is broken right at the target, so very difficult to access. - Has any of you dealed with this problem and know the best solution? - As far as we know is the targ-i signal not used for steering. Is that right? Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Fires in Bunkers! Date: Tue, 28 Nov 2000 08:36:49 -0800 From: Amanda Pemberton Subject: Fires in Bunkers! To: medical-physics-engineering@mailbase.ac.uk Cc: Linac Eng List Message-id: <001901c05959$7dd2c3e0$7a8d01d4@physics> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Dear All We are in the design stage of building a bunker for our new linac. We are looking at fire safety due to a new directive from the Dept of Health coming into force Apr 2001. Has anyone had: 1. Experience / know / have info of any fires in linac bunkers. 2. Problems with the evacuation of patients. I would appreciate your help. Please e-mail privately if preferred. Many Thanks John Macmillan Radiotherapy Physics Radiotherapy Dept. Royal Shrewsbury Hospital UK 01743 261302 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Motion Interlock Date: Tue, 28 Nov 2000 08:04:25 -0800 From: Thomas McCausland Subject: Re: Motion Interlock To: Daryl Knox , linac-eng@plato1.aristotle.net Reply-to: acceltek@acceltekservice.com Message-id: <3A238329.26191.2BF034C@localhost> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Date sent: Tue, 28 Nov 2000 05:26:55 -0800 (PST) From: Daryl Knox Subject: Motion Interlock To: Linac > I hvae a 2100c sn# 301 that is giving motion faults on > the couch longatudional. Pot has been changed when I > discovered that it only happens with beam on and > mostly in 15X. Ths D/O pcb has been changed and even > the Klystron (Was at max fil and low in power anyway). > The Kly timing has been changed and seems to help but > still getting the fault. It seems to be noise. Any > Ideas? > > Daryl Knox > oxiknox@yahoo.com =============== Reply Seperator =================== This war story happened on a Siemens Mevatron 6, so it is not entirly applicable, but somewhat related as it has to do with noise with HV ON. Customer called and reported no doserate. I arrived on-site, and they also reported a strange noise from inside the room when they went to beam on. I tried beaming on. Yep, no dose rate, and a strange rhythmic, sort of thump, thump, thump sound from inside the room that you could hear over the buzz of the modulator. The customer speculated that the noise was a relay, but it didn't sound like a relay to me. I wanted to find out what the noise was so I turned off HV, went inside the room and had a tech go to rad-on. No thump. - Huh.. Turned on HV, de-tuned AFC, closed Jaws, and pointed the sharp end of the machine towards the far wall, and had the tech go to beam on while I cowered behind the maze wall...Thump, Thump, Thump. I stuck my head around the maze, and saw the Sorenson bending magnet power supply oscillating from zero current to peg the meters - full warp at about a 1 sec. period. The thump noise was the sorenson trying to crawl out of the equipment rack as it was trying to deal with the delta - I. I said to myself 'WOW'. I thought of trying to monitor the BMI program line with a scope, but I figured it would just confirm that yes, I had noise on the program line, and that would not tell me the source. Canidates for the noise source, in my mind were - HV PS, modulator (et al), pulse cables, pulse tank, and maggie. Maggie current on the scope looked normal, and there were no HV or modulator related interlocks. Luckly we had some dummy resistor banks at the office that could be substitued for the pulse tank, and maggie. Using those, I isolated the problem to the pulse tank. I still couldn't quite belive it when I called the factory for a replacement tank. Me - Uhh, I'd like to order a pulse tank please. Them - Why? What's your symptoms? Me - Ummm, the BMI is oscillating. Them - Yeah, sure...pull the other one. Anyway, replaced the pulse tank, and no thumping, and good dose rate returned. I think the factory called back a month or so later and reported the returned pulse tank as 'good'. Thats my story and I'm sticking to it. Regards to list. Thomas W. McCausland AccelTek Inc. http://www.acceltekservice.com 281-652-0059 888-619-8811 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: 600CD Yield Servo Date: Tue, 28 Nov 2000 07:58:13 -0800 From: "K. Yeung" Subject: Re: 600CD Yield Servo To: linac-eng@plato1.aristotle.net Reply-to: kimyeung@netvigator.com Message-id: <3A23D615.7433@netvigator.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi Colleagues, I have to adjust the Yield Servo every two to three weeks in order to keep dose within tolerance, as the magnetron I was reduced by the yield servo. I had already adjusted phase wand and delay line. Could anyone give advice on this issue? Thanks in advance. Kim Yeung --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Motion Interlock Date: Tue, 28 Nov 2000 07:23:35 -0800 From: "Maddox, Jerry" Subject: RE: Motion Interlock To: 'Daryl Knox ' , 'Linac ' Message-id: <36298D09ED1AD311B4DC0008C7F4D4E103DFF920@phsexch6.partners.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT I have seen such problems on 2100's. In one case I looked at the multiplexer on the A/D card, and saw DeQ noise hitting it at the same time as the sampling of the axis giving the fault. Interestingly, it was the DeQ recovery spike, not the firing spike. The noise and fault could be moved to another axis by changing the DeQing % (time). Varian worked on this also, since we had 90 faults in one morning, and it was during warranty. Moving Pulse cables away from others may help. There may be a specific DeQ % which works best. In another machine 50% was magic. Another main thyratron may be less noisy. Any arcing in the modulator will cause much grief. Varian has made some improvements in software which help some, not sure what, but think it is more samples before setting off an interlock. New machines separate noisy and quiet signals, a good idea. I suggest you talk with them, and try the DeQ %, cable routing, and check for arcing,grounding for opens or loops. I am curious to hear the answer, and to know if this started suddenly, like after some work was done. Good luck! -----Original Message----- From: Daryl Knox To: Linac Sent: 11/28/00 8:26 AM Subject: Motion Interlock I hvae a 2100c sn# 301 that is giving motion faults on the couch longatudional. Pot has been changed when I discovered that it only happens with beam on and mostly in 15X. Ths D/O pcb has been changed and even the Klystron (Was at max fil and low in power anyway). The Kly timing has been changed and seems to help but still getting the fault. It seems to be noise. Any Ideas? Daryl Knox oxiknox@yahoo.com __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: collimator brake problem Date: Tue, 28 Nov 2000 07:29:43 -0800 From: "Ray G. Van Ausdal" Subject: collimator brake problem To: Linac-eng@plato1.aristotle.net Message-id: <0011289754.AA975424864@mjh.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT I have a 2100C #369. Recently, a patient noticed a new noise during her electron treatments. It turned out to be the brakes on the collimator jaws were releasing during the treatment. The jaws were not moving. At first, they were releasing 10-20 times during the treatment, but the problem has gone back to once or twice in ten runs of 100 MU. I believe that both sets of brakes are releasing, meaning that there is a definite applied voltage to each. A couple of obvious relays have been replaced, so that it appears that the problem is that an enable signal is actually being generated. My service engineers are good at the normal diagnostic routines for this, but I thought I might be able to shortcut these efforsts if someone else out there has actually seen the problem and solved it. Thanks for the help. Ray Van Ausdal (physicist) Martha Jefferson Hospital Charlottesville, VA --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Cl.2100 broken TARG-I wire Date: Tue, 28 Nov 2000 06:40:47 -0800 From: CJ.de.Bruijne@walcheren.ziekenhuis.nl Subject: Cl.2100 broken TARG-I wire To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi colleagues, We found in our Cl.2100 (C2) last friday a broken TARG-I wire. It is broken right at the target, so very difficult to access. - Has any of you dealed with this problem and know the best solution? - As far as we know is the targ-i signal not used for steering. Is that right? Regards, Keesjan de Bruijne Ziekenhuis Walcheren Vlissingen, the Netherlands afd. DIA cj.de.bruijne@walcheren.ziekenhuis.nl --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: SL series electron cones for sale Date: Tue, 28 Nov 2000 06:19:56 -0800 From: Jill and Tom Ausfeld Subject: SL series electron cones for sale To: linac-eng@plato1.aristotle.net Message-id: <006e01c05946$494ade40$03000004@oemcomputer> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hello, I have a client interested in selling some rectangular electron cones he doesn't use. They are approx. 6 years old and in very good shape. Please respond to me if interested and I will get you in touch with him. sizes available : 6x20, 6x14, 6x10, 10x20, 8x16 thank you Tom Ausfeld tausfeld@frontiernet.net --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Motion Interlock Date: Tue, 28 Nov 2000 05:26:55 -0800 From: Daryl Knox Subject: Motion Interlock To: Linac Message-id: <20001128132655.13595.qmail@web1006.mail.yahoo.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT I hvae a 2100c sn# 301 that is giving motion faults on the couch longatudional. Pot has been changed when I discovered that it only happens with beam on and mostly in 15X. Ths D/O pcb has been changed and even the Klystron (Was at max fil and low in power anyway). The Kly timing has been changed and seems to help but still getting the fault. It seems to be noise. Any Ideas? Daryl Knox oxiknox@yahoo.com __________________________________________________ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. http://shopping.yahoo.com/ --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Thyratron grid control Date: Fri, 24 Nov 2000 06:11:45 -0800 From: "Twyman, Paul" Subject: Thyratron grid control To: 'LINAC-ENG' Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi to all I just thought that I would mention a problem, and its solution, we had here at Addenbrookes Oncology. We started to run our 600CD (505) at 600mu/min recently and within 4 days the thyratron grid control pcb died. The symptoms where YLD and no D'Qing action. The spare pcb was installed and away we went. Examination of the faulty board revealed that Q6 and R28 had failed so these were replaced. The next day the machine gave YLD and again no D'Qing. The thyratron grid control pcb died yet again. Same components. At this point it was clear that something else was probably causing this failure and a quick call to our local, freindly service support people suggested that there was probably a problem on the backplane pcb. A new backplane was ordered and duly arrived. We took the machine apart and replaced the backplane. The old backplane had clearly failed. The actual fault was arcing between XA4 pins 8 ABC to 10 ABC via 9 ABC. There is no board in slot XA4 on our 600CD. Also you cannot see the rear side of the backplane until you remove it, which is about a 1.5 to 2 hr task. 8 ABC is the main thy pulse (0v to -300v) and 10 ABC is the D'Qing thy pulse (+340v to 0v). 9ABC is the grid 1 (+120v). This is the same as for the XA1 socket but there is no sign of arcing on the rear of this socket. So if you get repetative thyratron grid control pcb's failing it would be worth removing the backplane and having a look at the back of the XA4 socket. Our new board has been mod'd by cutting the tracks that run to the XA4 connector. Regards Paul T --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: MarkII PV Date: Fri, 24 Nov 2000 04:54:23 -0800 From: "Lapenna, Russ" Subject: RE: MarkII PV To: "'yorkej@cbhc.ns.ca'" , 'LinacEng' Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hey Jeremy how are ya buddy. Had a similar problem here, and the fix was to reseat the RAM chips and recalibrate. Failing this check your battery, but in our case it was the RAM chips. They get hung in some sort of funk that the reseating eliminates. Good Luck Russ LaPenna Electronics Engineering Technologist Medical Physics Department Hamilton Regional Cancer Centre 699 Concession St. Hamilton, Ontario Canada L8V 5C2 (905) 387-9711 ext. 67017 > -----Original Message----- > From: Jeremy Yorke [mailto:yorkej@cbhc.ns.ca] > Sent: 23 November, 2000 2:19 PM > To: 'LinacEng' > Subject: MarkII PV > > > Good afternoon, > > Has anyone had any problems with their cpu board in the > control box for the > R-arm. I am getting bad xyz axis interlocks, all encoders > ok. System is > fine when I swap out CPU board from another unit. Bad cpu > board allows all > functions to work including calibration sequence, but when > "OUT" or any > preset position is selected it doesn't move and gives above > error. (23,34) > > Hoping for a fix other than ordering a new cpu board. Anyone replace > battery on board?? What were the symptoms?? > > Thanks in advance > Jeremy > > Jeremy Yorke C.E.T. > Electronics Technologist > Cape Breton Cancer Center > 1482 George Street > Sydney, Nova Scotia > B1P1P3 > (902)567-8000 ext.2163 > > > --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: 75/5 MAG/FIL PSU Date: Wed, 22 Nov 2000 19:04:17 -0800 From: BEHTS BEHTS Xray Subject: 75/5 MAG/FIL PSU To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT ** Confidential ** ** High Priority ** Has any one else experienced a melt down of Mag/fil transformer T2 .In our case it appears the rectifier bridge failed (short curcuit) which allowed excess current flow thru the secondary which in turn created a great deal of smoke.In 1998 a factory mod was fitted which removed the secondary fuse protection and inserted it in the primary. X-ray Engineers Q Health --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: MarkII PV Date: Thu, 23 Nov 2000 11:19:27 -0800 From: Jeremy Yorke Subject: MarkII PV To: 'LinacEng' Reply-to: yorkej@cbhc.ns.ca Message-id: <01C05560.C4EC0F40.yorkej@cbhc.ns.ca> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Good afternoon, Has anyone had any problems with their cpu board in the control box for the R-arm. I am getting bad xyz axis interlocks, all encoders ok. System is fine when I swap out CPU board from another unit. Bad cpu board allows all functions to work including calibration sequence, but when "OUT" or any preset position is selected it doesn't move and gives above error. (23,34) Hoping for a fix other than ordering a new cpu board. Anyone replace battery on board?? What were the symptoms?? Thanks in advance Jeremy Jeremy Yorke C.E.T. Electronics Technologist Cape Breton Cancer Center 1482 George Street Sydney, Nova Scotia B1P1P3 (902)567-8000 ext.2163 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Job Opportunity Date: Thu, 23 Nov 2000 05:57:23 -0800 From: Chris Barnardo Subject: Job Opportunity To: "Linac-Engineers, Listserver" Message-id: <3A1D2243.419C4E05@scf.sk.ca> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT PHYSICS TECHNICIAN I (ELECTRONICS) The Saskatoon Cancer Centre, a division of the Saskatchewan Cancer Agency, is accepting applications for the position of Physics Technician I (Electronics). The Saskatoon Cancer Centre is the outpatient cancer treatment, education and research facility, serving Central and Northern Saskatchewan. Reporting to the Director of Medical Physics the Physics Technician I is responsible for the maintenance, repair, design and fabrication of complex electro-mechanical equipment in the Radiation Therapy Department. The equipment includes four linear accelerators, two treatment simulator and orthovoltage x-ray unit as well as a variety of computers and computer based equipment. Typical duties include testing, repairing, servicing, maintaining and assisting with installation of equipment; assisting in the construction of electronics circuits and equipment; performing some computer programming. The successful candidate will be a graduate from a recognized electronics engineering technology program. Experience working with biomedical equipment/radiation therapy equipment is preferred. Individuals meeting these requirements and interested in joining the Saskatoon Cancer Centres' Physics team should forward their resume no later than December 1st to: Dr. Narinder Sidhu Director of Medical Physics Saskatoon Cancer Centre 20 Campus Drive Saskatoon, SK S7N 4H4 Phone: (306) 655-2697 Fax: (306) 655-2701 Email: nsidhu@scf.sk.ca --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Siebe 3-way water valve Date: Thu, 23 Nov 2000 05:38:09 -0800 From: "K. Yeung" Subject: RE: Siebe 3-way water valve To: Linac-eng@plato1.aristotle.net Reply-to: kimyeung@netvigator.com Message-id: <3A1D1DC1.6282@netvigator.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi Colleagues, Can anyone advise Siebe's part number of the 3-way water valve used on Varian 2300CD? Thanks in advance. Kim Yeung --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Mevatron Pulse Transformer Change Date: Thu, 23 Nov 2000 02:47:14 -0800 From: rtexec Subject: RE: Mevatron Pulse Transformer Change To: al_najjar@yahoo.com, linac-eng@plato1.aristotle.net Message-id: <3A1CF5B2.2E331FA7@pd.jaring.my> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Waleed: When commissioning a Mevatron and doing the acceptance test the Siemens engineer will run the Accelerator for long periods of time. This is even more true when a Physicist is collecting beam data for the treatment planning system. It is a good idea to take breaks every once in a while to allow the machine to cool off a bit. But I have run a Siemens accelerator for 8 hours or more with only short breaks and a quick lunch while doing scanning and then repeated this for a few days and never had any problems. Actually that's not 100% true but any problems I had were usually with the water or the room temperature. Of course there are component failures and a pulse tank can also be marginal. In your friends case if 3 pulse tanks have been replaced in quick succession then you can bet it is not the pulse tanks that are bad, they are just a symptom of what the true problem is. I would suggest that the engineers take a very good look at the HV Pulse waveform and all waveforms in the modulator section for anything abnormal. Also it might be a good idea to check all the connections to the pulse tank and in the HV area. I am sorry I can't be more specific, its been a little while since I worked on that part of the accelerator and if you don't use it you lose it. Good Luck Sid Mauck RT Exec --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Mevatron Pulse Transformer Change Date: Wed, 22 Nov 2000 17:26:59 -0800 From: "Waleed Al-Najjar, Ph.D." Subject: Mevatron Pulse Transformer Change To: MEDPHYS@LISTS.WAYNE.EDU Message-id: <20001123012659.10233.qmail@web10001.mail.yahoo.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT List Members: A friend of mine who does not have access to the list asked me to post this question for him. I have a question to mainly linac engineers but I am sure we have experts on this list to answer that question. A pulse transformer has been replaced 3 times in less than a month on a brand new Mevatron with a Magnetron (15 MV) and Siemens engineers are saying it is because the Physicists who are commissioning the Linac are scanning continuously Is that true? And is that the only reason for changing a pulse transformer? Thank you very much for your prompt reply. Regards, Waleed _____ Do You Yahoo!? Yahoo! Shopping - Thousands of Stores. Millions of Products. --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Varian 2100C Bending Magnet Date: Wed, 22 Nov 2000 06:27:29 -0800 From: Scot Thiesson Subject: Re: Varian 2100C Bending Magnet To: Keith Croft Cc: 'Linac eng' Message-id: <3A1BD7D1.26348B45@scf.sk.ca> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Keith Croft wrote: > > Has anyone had the window implode on their bending magnet? > > Keith > Plamerston North. > Varian 2100C Serial #86. > No thank God. That would be a bad thing. A very bad thing! _________________________ Scot Thiesson Senior Physics Technician Allan Blair Cancer Centre Regina Sask. Canada 306 766-2286 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: CTRL interlock Date: Tue, 21 Nov 2000 17:46:50 -0800 From: "Jeffrey L. Cressman" Subject: Re: CTRL interlock To: Rtsolution@aol.com Cc: linac-eng@plato1.aristotle.net Message-id: <3A1B258A.40F38B89@voyager.net> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT My experience is more with the High Energy C Series machines but I am betting you have the same problem I have seen on them. On a HE C Series machine the Key switch completes 2 different circuits when switched form disable to enable. One circuit is the KEY fault. The second circuit is used to allow 120 VAC to the coil of the primary high voltage contactor in the Modulator. A second door switch is sometimes placed in series with this other half of the key switch. Right at beam on the contactor is pulled in if the second key and door switches are closed. A piggyback relay on the primary contactor is used to return a BEAMON signal. In the older C Series machines if a NO BEAMON signal is detected a CTRL I/L is generated. The newer C3 Series machines generate a HWFA I/L . If you've already swapped out the Key switch, then it's usually the second door switch (if you have one). The door switch with -12V is the DOOR I/L the one you want to check is the other switch ( it normally has 0V on it if the key is in the disable position). Even if this second door switch checks ok, I would replace it. The next thing is to check out the piggyback relay, the primary contactor, and make sure all 120VAC terminal connections leading to the coil of the contactor are screwed down tight. Unfortunately the CTRL I/L is used as a kind of catchall I/L. Good Luck, Jeff Cressman Sparrow Regional Cancer Center Lansing, MI Rtsolution@aol.com wrote: > Hi, > > Just want to know anybody else has this bugging problem. > > 600C C2 machine. > > This machine from time to time has CTRL I/L fault about once a week. In the > event log it come with Beamoff Intrt missing - 01 or - 02. > This happens when the radiographer turn the from disable to enable(Ready). > > I have changed the relays in the chain, Timer I/F, Control Timer and the key. > One thing I haven't done is the Data I/O pcb and cable. > > Has any one has a specific list of the actions to solve this. > > Thanks in advance. > > RT bart --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Varian 2100C Bending Magnet Date: Tue, 21 Nov 2000 15:01:13 -0800 From: Keith Croft Subject: Varian 2100C Bending Magnet To: 'Linac eng' Message-id: <00BE56E17E26D11197CB00805FA6803A023BBAB9@mail.midcentral.co.nz> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Has anyone had the window implode on their bending magnet? Keith Plamerston North. Varian 2100C Serial #86. ###################################################################### Attention: This e-mail message and any attachments contain information that is confidential and may be subject to Legal and Medical privilege. If you are not the intended recipient, you must not peruse, use, pass on or copy this message or any attachments. If you have received this e-mail in error, please notify us by return e-mail and erase all copies of this message including any attachments. MidCentral Health does not accept any liability in respect of any virus which is not detected. This e-mail message has been scanned and cleared by MailMarshal ###################################################################### --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Spares Date: Tue, 21 Nov 2000 11:37:22 -0800 From: jim@northcoast.f9.co.uk Subject: Spares To: linac-eng@plato1.aristotle.net Reply-to: jim@northcoast.f9.co.uk Message-id: <20001121193722.northcoast@f9> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi Folks, We have for disposal, spare parts for a Varian 1800 (ind jaw). Parts mainly consist of spare boards. If anyone is interested please e-mail me. Regards. Jim Wallace The Princess Royal Hospital Hull England --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: CTRL interlock Date: Tue, 21 Nov 2000 08:54:40 -0800 From: "Leonard C. Johnson" Subject: Re: CTRL interlock To: Rtsolution@aol.com Cc: linac-eng@plato1.aristotle.net Reply-to: lenj@CancerBoard.ab.ca Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT rt bart; Try re-wiring the keyswitch so that both beam enabling circuits are on the same contact block. On Tue, 21 Nov 2000 09:12:46 EST Rtsolution@aol.com wrote: len > Hi, > > Just want to know anybody else has this bugging problem. > > 600C C2 machine. > > This machine from time to time has CTRL I/L fault about > once a week. In the event log it come with Beamoff Intrt > missing - 01 or - 02. This happens when the radiographer > turn the from disable to enable(Ready). > > I have changed the relays in the chain, Timer I/F, Control > Timer and the key. One thing I haven't done is the Data I/O > pcb and cable. > > Has any one has a specific list of the actions to solve > this. > > Thanks in advance. > > RT bart ---------------------- Leonard C. Johnson lenj@cancerboard.ab.ca --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: CTRL interlock Date: Tue, 21 Nov 2000 06:12:46 -0800 From: Rtsolution@aol.com Subject: CTRL interlock To: linac-eng@plato1.aristotle.net Message-id: MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi, Just want to know anybody else has this bugging problem. 600C C2 machine. This machine from time to time has CTRL I/L fault about once a week. In the event log it come with Beamoff Intrt missing - 01 or - 02. This happens when the radiographer turn the from disable to enable(Ready). I have changed the relays in the chain, Timer I/F, Control Timer and the key. One thing I haven't done is the Data I/O pcb and cable. Has any one has a specific list of the actions to solve this. Thanks in advance. RT bart --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Heat exchange replacement Date: Mon, 20 Nov 2000 09:22:15 -0800 From: Scot Thiesson Subject: Re: Heat exchange replacement To: kimyeung@netvigator.com Cc: Linac-eng@plato1.aristotle.net Message-id: <3A195DC7.E3EAEB53@scf.sk.ca> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Varian supplied us with ours, but then again, it was on warranty. "K. Yeung" wrote: > > Hi colleagues, > > Could anyone advise where I can find the stainless steel version of the > exchanger for Varian 2300CD? > > Thanks in advance. > > Kim Yeung -- _________________________ Scot Thiesson Senior Physics Technician Allan Blair Cancer Centre Regina Sask. Canada 306 766-2286 --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Heat exchange replacement Date: Sat, 18 Nov 2000 06:50:45 -0800 From: "K. Yeung" Subject: Re: Heat exchange replacement To: Linac-eng@plato1.aristotle.net Reply-to: kimyeung@netvigator.com Message-id: <3A1696E1.59F1@netvigator.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi colleagues, Could anyone advise where I can find the stainless steel version of the exchanger for Varian 2300CD? Thanks in advance. Kim Yeung --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: simulator needed Date: Fri, 17 Nov 2000 16:52:58 -0800 From: Vladimir Holecek Subject: simulator needed To: linac-eng@plato1.aristotle.net Reply-to: Vladimir Holecek Message-id: <001101c050f9$e8b79cc0$95a023d0@sprintion.com> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Is anyone phasing out or replacing a sim that's around 10 yrs old. Would be interested knowing brand, model, age and price thanks Vlad Holecek bessinc@earthlink.net --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Thyratrons Date: Fri, 17 Nov 2000 13:48:41 -0800 From: "Maddox, Jerry" Subject: RE: Thyratrons To: 'Christopher L Bartee ' , "'linac-eng@plato1.aristotle.net '" Message-id: <36298D09ED1AD311B4DC0008C7F4D4E103DFF91C@phsexch6.partners.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Would be interested to know the serial numbers. -----Original Message----- From: Christopher L Bartee To: linac-eng@plato1.aristotle.net Sent: 11/17/00 8:46 AM Subject: Thyratrons Thanks to all for your response to my question about thyratrons: The problem was a thyratron. After 4, I finally got one that worked. These were all EEV tubes. Again I want to thank everyone. I started to feel like the guy who kept replaceing fuses hoping to find one that wouldn't blow. Chris Bartee Medical College of Virginia/VCU --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Re: Thyratrons Date: Fri, 17 Nov 2000 18:34:57 -0800 From: "Jan B.Korrubel" Subject: Re: Thyratrons To: Christopher L Bartee , linac-eng@plato1.aristotle.net Reply-to: "Jan B.Korrubel" Message-id: <002301c0510a$188b9ea0$65b51ec4@kenilworth> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Thyratrons only work well when fresh. That is, if they have a long time standing on the rack, their hydrogen gas supply diminishes and so their life.. Only use the one that you bought recently and check the manufacturing date. Jan B. Korrubel Linear Accelerator Engineer for JTK Accelerator Group Cape Town South Africa ----- Original Message ----- From: Christopher L Bartee To: Sent: Friday, November 17, 2000 5:46 AM Subject: Thyratrons > Thanks to all for your response to my question about > thyratrons: > > The problem was a thyratron. After 4, I finally got one that worked. > These were all EEV tubes. Again I want to thank everyone. I started to > feel like the guy who kept replaceing fuses hoping to find one that > wouldn't blow. > > > Chris Bartee > Medical College of Virginia/VCU > > > --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: Philips RT-250 Parts Date: Fri, 17 Nov 2000 08:05:20 -0800 From: Chris Barnardo Subject: Philips RT-250 Parts To: "Linac-Engineers, Listserver" Message-id: <3A155740.7B27B786@scf.sk.ca> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hi Fellows: We have a problem with our RT-250. Does anyone out there have the 7 pole Slider Potentiometer used for the current control. It is CA R4. p/n 4512-908-62812-001. Thanks in advance -- ------------------------------------------------------ Chris Barnardo Electronics Technologist Saskatoon Cancer Centre Saskatoon, Saskatchewan Canada S7N 4H4 Phone: (306)655-2699 Fax: (306)655-2701 e-mail: cbarnardo@scf.sk.ca ------------------------------------------------------- --Boundary_(ID_ZsrBmxYamIzMsWWOij+sIg) Content-type: MESSAGE/RFC822 Content-description: RE: Siebe 3-way water valve Date: Fri, 17 Nov 2000 07:54:51 -0800 From: "Maddox, Jerry" Subject: RE: Siebe 3-way water valve To: 'Tirabassi Michael ' , "'Linac-eng (E-mail) '" Message-id: <36298D09ED1AD311B4DC0008C7F4D4E103DFF91B@phsexch6.partners.org> MIME-version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: 7BIT Hate to hear of so many problems, have had enough with leaks. We have recirculated chilled water, treated and lower flow due to 55 deg temp. Have not seen your problems, only shaft corrosion. tx -----Original Message----- From: Tirabassi Michael To: Linac-eng (E-mail) Sent: 11/15/00 11:50 AM Subject: Siebe 3-way water valve Yo everyone! I'm having a problem with the 3-way water valve on our 21EX. We installed this machine in 1/00. We are on our 3rd valve and this one is already showing signs of failing, i.e. water temp in standby < 40 degC. The problem is with the brass valve seat being eaten away and with the machine in standby the temp will not stay stable @ 40C. Siebe changed the design of this valve from the O-ring style seat to the now all brass seat. I've had a similar problem with the new style valve on our 1800 but was fortunate enough to have had a used but good O-ring style. The temp on the 1800 with the old valve is rock solid @ 40C. New style vavle - 8 months. Old style valve with O-ring - 3 to 5 years. I believe the facility water is causing this problem. We are not on a chiller, we're talking straight city water! The bypass valve is closed. The EX has no supply strainer like the 1800 has. Has anybody else experienced this problem? I"m going to try a particle filter on the incoming line to the machine or if I can find the old style valve or both! Any suggestions anyboby??? Thanks much! Mr. T