Still trying to solve this K6100 HV

I am still digging into this HV unit which is giving me some troubles. Here
is what I have observed.

The collector of q901 is way off of spec and I don't understand the circuit
well enough to understand what is causing it. And the base / emitter of
Q900 are about double what they should be.

I have checked the values of all the resistors and they are fine.

I have replaced q900 with a bu406d (verified good in another HV unit).

I have replaced q901 & q902.

Any suggestions? Thanks.

I have attached a copy of the schematic with my noted values in red.

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Received on Sat Oct 15 02:25:13 2011