Error: HT CB activates after 20 to 30 monitor units. or. The linac is
terminated after apr. 100 mu and is ready to start again. After
restarting the same termination is repeated.
Check if one of the HT PSU fuses is blown.
(PSU is humping on two phases!)
![\begin{figure}{\includegraphics[height=0.6\textheight]{/local_scratch/kok/faq/plaatjes/htfuse.eps}}
\end{figure}](img6.png)