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<DIV><FONT face=Arial size=2>Hello all,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have an old Sequential Circuits Pro-One that I'm
trying to whip back into shape. I've cleaned it up, fixed a broken
black key, replaced and replaced all the brushings. I'm pretty proud
of the way it looks-- and it sounds even better. Yet not all is
perfect... </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The problem I'm having is with the J-wire
keyboard. Five of my keys don't work. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>The keys are (from left to right): The 1st
'D#', 1st 'B', 2nd 'G', 3rd 'D#', 3rd 'B'. </FONT><FONT face=Arial
size=2>All of the j-wires make contact. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>At first I thought the offending wires might just
be dirty, so I gave all of them a q-tip - isopropyl rubdown. This didn't
do anything.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Next, I generously sprayed Deoxit on the wires and
the contact bar to the point that the wires were basically dripping red fluid.
(overkill, I know-- but those spay nozzles aren't easy to control).
</FONT></DIV>
<DIV><FONT face=Arial size=2>I powered her up and amazingly all the keys worked
perfectly. Problem solved, I thought... The next day the problem had
returned-- same keys, no sound. I guess the fluid had dried on whatever
needed it most.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Still thinking it was the j-wires I bought some,
clipped the old ones off, and soldered new ones in place. That was this
morning. Needless to say, the problem is still there with fresh
j-wires.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Then I saw the pattern. Counting from the
first bad key, every eighth key has a problem. Offending keys are exactly 2
octaves apart. This pattern should tell me something, but I'm not
sure what. Perhaps a bad pin on the ribbon connecting the keyboard to
the main pcb? But why would the Deoxit have worked, if ever so
briefly?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Is anyone out there with a familiarity of pro-one
keyboard circuitry or j-wire keyboards in general? I'm slowly teaching
myself electronics so I do have a cheap Radio Shack multimeter at my
disposal. I would appreciate any help/suggestions/ideas in this
matter.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>-Tom</FONT></DIV></FONT></DIV></BODY></HTML>