If that works, you might wish to go forwards from there, see that the signals are getting to key components like address latches, ROMs, tristate buffers and so on.
Nik
inocencio66 wrote:
--- In vintagesynthrepair@yahoogroups.com, Philip ...>
wrote:
>
> Dont know, but i'd start by checking the power supply.
>
> Phil.
>
> --- inocencio66 ...> wrote:
>
> > The SH-101 powers up normally but the key transpose
> > LED stays lit and
> > all the buttons do not work. And it doesn´t make any
> > sound.
> > Is this a common and easy problem to fix?
> >
> > Thanks.
> >
Yes, but what to check? The service manual is not of much help; well at
least not for me: no checkpoints nor voltage references...
It seems to be the CPU giving trouble. What to look for?
Regards,
Nick Sargeant
Director
IT Architecture and Consultancy
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