Crumar Performer - Keyboard Issues

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Re: Crumar Performer - Keyboard Issues

Postby rhino » Fri Nov 28, 2008 5:47 pm

you've got it made. carefuly swap two of the TDA1008 chips and see if that clears the "C" problem. if so, contact Maschenegiest for a replacement search.
"A thing may seem impossible...until it's done."
--Nelson Mandela
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Re: Crumar Performer - Keyboard Issues

Postby Low_Fi » Sun Nov 30, 2008 6:04 am

Thanks for the tip, rhino! :D

I swapped two TDA1008 chips (C with C#). The good news is that it 'fixed' the dead bottom C issue but there's still a long sustain on all C's. The problem didn't follow the chip so it looks like the TDA1008 chip is good. I'm going to try removing the chip from C again and spraying some contact cleaner in there. Since the dead bottom C was restored, I can only assume there was dust that was dislodged when I swapped chips. I wonder if it's also just an issue with dust on pin 7 on C. The synth was in the guy's garage for years and it was quite dirty. It's worth a shot, anyway.
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Re: Crumar Performer - Keyboard Issues

Postby Low_Fi » Sun Nov 30, 2008 6:25 am

So the contact cleaner idea didn't work. ](*,)
I guess I should start looking at the connections leading up to pin 7?

I'm leaving for business until Friday night so I won't be able to get to this until next weekend. :(
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Re: Crumar Performer - Keyboard Issues

Postby rhino » Sun Nov 30, 2008 8:41 pm

ok, you've gotten this far: now round up the usual suspects...

bad solder joint on socket (don't forget jumpers along the line)

cracked or lifted trace

let us know
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Re: Crumar Performer - Keyboard Issues

Postby Low_Fi » Sat Dec 27, 2008 12:45 am

So I finally cracked the Performer open again after letting it sit for almost a month.

The schematic showed that all pin 7's are connected together. So I traced pin 7 from the IC on the board in the C section to where a tiny spring was inserted and soldered in place. There was a trace that led to all the remaining pin 7's on the other IC chips. The trace looked fine but the spring in pin 7 on the C section looked like it was barely soldered to the board. I just applied more solder and bingo, the C notes no longer held an infinite sustain. Fixed! :D

So to summarize in case anyone else runs into similar issues with their Crumar, I started out with the bottom C being completely dead and the remaining C's having a much prolonged sustain in comparison to the other notes no matter where the sustain slider was positioned. Swapping out the IC's in the C section with an IC from another note section corrected the dead C. That turned out to just be a bad connection. The C sustain issue was corrected by applying more solder to the spring leading to pin 7 on the IC in the C section.

Big thanks out to rhino for the advice and encouragement throughout this repair!
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Re: Crumar Performer - Keyboard Issues

Postby rhino » Sat Dec 27, 2008 2:54 am

that's the beauty of having message boards like this. nobody can know everything, but everybody knows SOMETHING.
thanks to the administrators for setting up this board and keeping it running smoothly, even when obcessing about hair-styles and brain-in-penis syndrome. (lol)
"A thing may seem impossible...until it's done."
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