I'm having trouble with occasional resets on Gorgar. Pinwiki led me to check the unregulated 12V, and while I understand it can vary, I'm only getting 10V. I traced the 10V all the way back to the diodes on the power board, which are new 6A4 diodes that I installed per this guide. I'm getting 9.5 VAC on the other side of the diodes, which looks correct per the schematic.

Granted this was tested when it booted up fine. My guess is 10V is borderline ok, but it's occasionally dropping below that and causing the reset. What should I be changing or checking here if that's the case? New diodes again? Or does it sound more like I'm going down the wrong path with the reset issue?

I first checked at the MPU and that's where I saw 10V, at TP1. Then checked at the MPU connector, then power supply connector, fuse, capacitor, and diodes. Same everywhere.

I'm getting 10.0 VDC at each clip with F5 in, and 13.1 VDC with F5 removed.

Before:
10.0 to 9.5 VAC, and 9.7 to 9.6 VAC

Didn't do a great job of cleaning those fuse clips with the big cap in the way, but I looked at the fuse for the one with the 0.5V drop, and it was measuring about 5 Ohms resistance. It was also a 1/4A fuse! I replaced that with a 2.5A SB fuse (don't have any 4A on hand).

After:
9.9 to 9.8 VAC, and 9.8 to 9.8 VAC
Diodes both measured 9.8 VAC going in and 11.1 VDC coming out.

MPU TP1 is now getting 11.0 VDC, so definitely an improvement over where I started. Anything else I should be looking at? If not I'll just keep an eye on it and see if I get any more resets.