On Wed, Mar 6, 2019 at 12:16 AM Alan Perry via cctech <cct...@classiccmp.org> wrote: > > For a little background, I had run the system for about 15 minutes, then > it sat for a couple months while I removed the PVA from the display, > then, when I tried to run the system again, the system started to boot > and then the circuit breaker popped.
This is a switch mode power supply with all the failure modes that that implies :-) I'd start by checking the mains bridge rectifier (actually used as a pair of diodes in a voltage doubler circuit on 110V mains), the mains smoothing capacitors (820uF?) and the BUV47 chopper transistor. If the last is short-circut then it's very possible it was damaged by a fault elsewhere in the PSU. -tony
