I've got a Data East Simpsons where the 5v recently quit working. Awhile back I replaced the caps at C2 (it was tested bad) and C3 and the power supply has been working fine for quite some time after alot of hours on it (it's a location machine). The traces for C2 are good and have continuity.

I tested those two caps again with my ESR meter and they look good. I checked diodes D2 and D3 and they are good as well. I thought the LM723 was bad so I replaced that and still no 5v.

What else should I be looking at?

I forgot to add that I tested the 2N6057 with my DMM and it looks good. I guess it's possible it's failing under load but I don't have another one readily available to swap out.

Yeah I've already looked at all that. The molex connectors are good. 12v and -12v are good as tested at the power supply. I'm thinking perhaps the 2N6057 might be failing under load as I'm not really sure what else it could be.

I got it working. One of the fuse clips coming off the BR was corroded a bit causing the fuse to not make a good connection. Thanks for the info!