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

[Mark Romberg]

well it powers up, and it does give some audio output, so i'm hoping it 
isn't the CPU.  cant open it up to have a look as i'm in contact with 
the seller online, and i don't think he has any other analog gear with 
which to test the SH's gate/CV outs :/
thank you for your help so far :)

have nice days.

On 11 Jun 2004, at 00:35, Roman wrote:

> 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
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