Quote:
Originally posted by Zilch
The term "Phase Control Regulation" is a clue as to why the voltage is so high on the caps:
A predecessor of today's switching regulator power supplies, phase control was used to modulate the AC at the transformer to maintain a constant voltage at the power supply DC output. Since the filter capacitors are not working, it thinks the DC is too low, and turns full on in an attempt to bring it up to the regulation voltage.
Alternatively, the phase regulation circuitry is itself not working, and that overstressed the capacitors. We'll know more once you get the schematic and the capacitors. You should still be able to follow the transformer output leads to the bridge rectifier if the phase control is being done on the transformer primary.
The board on top of the capacitors looks to be the power supply phase regulation circuitry. I don't see anything smoked there. I'm surprised there is not some failsafe circuitry in there to shut it down in such a case as this unit is experiencing.
Don't be pokin' around with it plugged in, needless to say....
Thanks Zilch