Re: [sdiy] kinda offtopic...SH-101 repair?

[Roman]

it's not off-topic at all
If the synth is not responding, that may be anything from burned all components to flaky power connector. ;)
First check if there are proper supply voltages. Test them at IC pins, as it's easiest to find. Then use scope or amplifier input with voltage divider to trace where the signal is trapped. Test wires from the keyboard, if there's any activity, there should be couple of hundred Hz in half of them, then find the CEM3340 and seek for any sound, then go to VCF, which I think is IR3109 or whatever that was, and do the same.

I have seen 2 broken SH101 so far. One had dead CPU, the other had CEM destroyed. Both cases are the worst what can happen.

Roman

---- Wiadomość Oryginalna ----
Od: Mark Romberg <mark-romberg at utulsa.edu>
Do: synth-diy at dropmix.xs4all.nl
Data: Fri, 11 Jun 2004 01:52:02 -0500
Temat: [sdiy] kinda offtopic...SH-101 repair?

>lookin at a kinda damaged SH101, wondering if anyone knows how hard it 
>would be to repair electronic problems with it?  the output is really 
>low and it doesnt really seem to really develop a tone (VCO not 
>oscillating? VCA not amplifying?).  i hav experience disassembling 
>electronics and soldering things, im just wondering are there parts 
>that are unobtainable or some other situation that would make it 
>irreparable?
>
>have nice days.
>
>