[sdiy] TR-909 repair Q

[Dan Gendreau]

> From: Jim Johnson
>
> The snare's "crack" sound is intermittently inaudible. What happens is
> that, when it's first powered up, the snare works fine, but after
> some time
> - five minutes, an hour, whatever - the "crack" slowly fades away to
> nothing.
>
> Clearly it's something in the snare's VCO.. but what? The guy has been
> trying to isolate it with heat and cold, but so far no luck - once it goes
> away, it stays away.
>
> Hoping that someone else has run into the same problem, and solved it.

Hmmm... Well, Ive seen this sort of thing before. I'm sorry to say that its
very likely terminal. You might as well just send it to me so I can take
care of it in its remaining days... :P

Hehe, Anyway it should not be too hard to isolate. I have the 909 service
manual around here somewhere. If you need it I could track it down and send
you a scan of the SD circuit...

-Dan Gendreau