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I might have traced the lack of +12 V to the voltage regulator in that line. I say “might” because I sometimes got readings from it on my voltmeter, sometimes not at all. This might have been purely because it is so flipping hard to reach with the probes. It must finally have shorted as I saw a nice big white spark between its legs (ooh-er, missus), and then it was gone. That short seems to have cascaded backwards (is that even possible?) because now I have a blown fuse F4, which serves the aforementioned rectifier S1WBA10. So, now I have no +12 V or /RES! However, I seem to recall /RES was back to running properly at +5 V some time before the fuse blew… I don’t know; it’s all blurring together.

As you can see, I need to stop this for a while and have a sleep. On the plus side, I didn’t die. I guess? That’s probably a good thing.

/RES is/was presumably the real issue here; credit to acreil at GS for noticing that as it might have taken me ages to realise. So, the next steps are to replace that fuse, hang some wires off that vreg to test it safely… and learn the dark art of transistors, I suppose.

I replaced several electrolytic capacitors while I was at it, which might improve my odds once the fuse is repaired, but me tell you: the PSU was not made for easy servicing, as without cutting some of the main wires, you can only balance it on its side (via the heatsink) and sort of poke at it horizontally with the soldering iron. The same applies to the main board, by the way, which just has to chill on its side at the back of the chassis.

Casio FZ Samplers

Re: Casio FZ-10M fails to boot: only screen light + sometimes 2 red LEDs. How to fix? Thanks!

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