Message
Re: Casio FZ-10M fails to boot: only screen light + sometimes 2 red LEDs. How to fix? Thanks!
2014-12-13 by db0451@...
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Yeah, checking voltages so far, I still have only one thing missing:
http://i.imgur.com/NRkYXXC.pngBut I doubt that FD +12 V can be holding up the rest of the system; I managed to get the FDD to make disgruntled noises by feeding it power hijacked from a PC, and the FZ didn’t care either way.
Nonetheless, I’d like to ‘walk back’ from that cap (with the voltmeter) to determine whether anything more serious/early than an electrolytic is broken here. Does this sound plausible, and if so, would you be able to suggest what/how to probe? Thanks.
Also, very good point about the RES line [CPU/system reset, active low]; I’ll check that next. It does seem to trace back to the S1WBA10 rectifier that also sources the failed +12 V… :-O
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intriguing: CPU RES line seems to hover around 0.12 V, whereas being active low, I assume it is meant to bounce up to +5 V a few seconds after power-on.
Next thing is to test the hell out of that S1W rectifier – because both the missing +12 V FD power and /RES signals eventually trace back to there. For someone who, as is obvious, is very new to these sorts of diagnostics and circuits… how would I go about testing a rectifier? Datasheet first, of course… off to Google I go.
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Basically, what sort of DC should I expect to find if the rectifier is working properly? Testing with power on will have to wait till I get someone to operate the button for me, as its location is too close to some huge caps and whatnot for my liking, to do it on my own.
Thanks again. Think this might be getting somewhere...!