I don't have this equipment but here is my feedback in addition to Mark's suggestions:
Digging around I found that the triangular generator stays in a state where isAre +17V, "+17V (DCPL 1)", -17V, "-17V (DCPL 1)" on sheet <1> stable when cold (not working)?
In the happy non-working state what are the voltages (partial list is OK if you don't have them all):
1) at the gate of Q200, and collector of Q292.
2) bases of Q230A and Q230B
3) bases of Q290 and Q292
4) emitters of Q140 and Q175
In case gate circuit is acting funny: Voltage at collectors of Q325 and Q315
until it decides to start working. I'm attaching two pictures of a normalWhat are the test points for the different traces?