No Output on JX-8P

[Tim Curtis]

I just subbed to this list a few weeks ago, and this is my first post.
Someone on the Analogue Heaven list recommended this as a good resource.

I have a JX-8P that has been sitting around for the last few years
making no noise.  I bought it that way, hoping that some day I'd learn
enough about it to try to fix it.  Truth is that I know nothing about
electronics whatsoever.  I'm finally trying to make the time to change
that.

Here's my situation-

This is a keyboard that I bought from a service department that was
brought in 10+ years ago and they were unable to get in touch with the
owner.  Therefore it was never repaired and remained there for several
years.  Over that time, the 2 wiring harnesses that connect the keyboard
to the main board were scaveneged.

When I bought it I redid the keyboard wiring and was able to get it to
play on 3 of the 6 voices.  Since then I have removed that wiring,
thinking that perhaps I may have done something wrong.

Currently I'm unable to get any sound out of it through MIDI.  Nothing
at all.

I plan to get a service manual for it, but honestly I am at square one
when it comes to repairing these things.  I really want to learn, but I
have no idea where to start with this board.

Could anyone give me some help as to a good starting point?  Perhaps
some tips on how to start tracking down the problem?

Thanks for taking it easy on a novice,


Tim