Amplifone VR2 problem

I'm rebuilding an Amplifone High Voltage pcb.

Followed the FAQ instructions, tested everything, replaced regulators
with 1.5A versions, recapped (correct polarity).

Testing with the BU406D removed, I get +-36V from deflection pcb J103.

Get a regulated +28V from VR1 but regulated=input (-36V) from VR2.

At first I thought it was odd that I had continuity between the case of
VR2 and the heatsink (I am using an insulator and a plastic screw) but my
working HV board does the same, I'm guessing I'm reading a path through
VR1 which isn't insulated.

So, am I blowing regulators? I installed a regular 1A 7924 in place
(as I don't have that many CVs) but got exactly the same problem.

Thanks!

Tony
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Received on Fri May 2 21:35:24 2003