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<DIV><FONT face=Arial size=2>Hi Again,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Just wanted to thank you all for your comments and
suggestions. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>After checking continuity I gave the ribbon
interface sockets of the main and keyboard PCBs a good squirt of contact
cleaner, along with the pins on both sides the ribbon. This did
the trick. It seems pin 8 just wasn't making solid electrical contact with
the corresponding ribbon sockets.</FONT></DIV>
<DIV><FONT face=Arial size=2>If it stops working after the contact cleaner dries
I'll just have to replace the ribbon cable and the pcb sockets. As
you can imagine, I'm glad I won't have to track down an 8021
microprocessor :-).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>All that troubleshooting and it turned out to be a
dirty/oxidized socket or ribbon pin. I think there is a lesson in this for
synth repair and perhaps synth design in general.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I certainly learned quite a bit about the circuitry
and mechanics of j-wire keyboards. Hopefully someone with a
similar problem will find this thread equally helpful.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks again everyone... this place is
great.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>-Tom</FONT> </DIV></BODY></HTML>