Crumar Performer - Keyboard Issues

Pulling out your hair? Don't know what to do or where to go? Ask in here.
Forum rules
READ: VSE Board-Wide Rules and Guidelines

If your Help request has been solved, please edit your first post in order to select the Image Topic Icon to let others know your topic has been solved.

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.
When the wise man points to the stars, the fool looks at the finger.
- Confucius
User avatar
rhino
Supporting Member!
Supporting Member!
 
Posts: 2605
Joined: Sat Aug 02, 2008 5:00 pm
Location: kentucky hills
Real name: bill
Gear: keepers:
Kurzweil K2500x
Ensoniq TS-12
Yamaha SY-99
Alesis QS-8
Roland JD-800
Roland JX-10
Akai AX-80
Ensoniq SQ-80
Korg DSS-1
Moog Mini
Fizmo

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.
User avatar
Low_Fi
Newbie
Newbie
 
Posts: 66
Joined: Wed Aug 08, 2007 12:00 am

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. :(
User avatar
Low_Fi
Newbie
Newbie
 
Posts: 66
Joined: Wed Aug 08, 2007 12:00 am

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
When the wise man points to the stars, the fool looks at the finger.
- Confucius
User avatar
rhino
Supporting Member!
Supporting Member!
 
Posts: 2605
Joined: Sat Aug 02, 2008 5:00 pm
Location: kentucky hills
Real name: bill
Gear: keepers:
Kurzweil K2500x
Ensoniq TS-12
Yamaha SY-99
Alesis QS-8
Roland JD-800
Roland JX-10
Akai AX-80
Ensoniq SQ-80
Korg DSS-1
Moog Mini
Fizmo

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!
User avatar
Low_Fi
Newbie
Newbie
 
Posts: 66
Joined: Wed Aug 08, 2007 12:00 am

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 p***s syndrome. (lol)
When the wise man points to the stars, the fool looks at the finger.
- Confucius
User avatar
rhino
Supporting Member!
Supporting Member!
 
Posts: 2605
Joined: Sat Aug 02, 2008 5:00 pm
Location: kentucky hills
Real name: bill
Gear: keepers:
Kurzweil K2500x
Ensoniq TS-12
Yamaha SY-99
Alesis QS-8
Roland JD-800
Roland JX-10
Akai AX-80
Ensoniq SQ-80
Korg DSS-1
Moog Mini
Fizmo

Re: Crumar Performer - Keyboard Issues

Postby therealrx » Thu Jan 31, 2019 3:51 pm

Hey everybody. A little late to the show, but I just picked up a Performer with one key that mostly makes no sound. Occasionally, the note will trigger for a fraction of a second. I've opened up the top and can see the springs attached to the keys, but am unsure how to access the key contacts. Do I remove the individual key from the springs, or is there a way to either pivot the entire keyboard up or somehow get at the underside of the keyboard? I see the screws on the bottom of the housing, but since I don't know what they're attached to, am reluctant to remove for fear of making things worse. Any help would be greatly appreciated.
therealrx
Newbie
Newbie
 
Posts: 2
Joined: Thu Jan 31, 2019 3:19 pm

Re: Crumar Performer - Keyboard Issues

Postby fh991586 » Wed Feb 06, 2019 6:33 pm

Welcome to VSE!
You should always check all the threads on a forum before posting, and it's better to start a new one than adding to a 11yo thread which might not even be directly related...
Considering your problem, have you check this thread?
viewtopic.php?f=5&t=62712
If it's only one key that causes the problem, it's probably a physical thing.
Considering parting away from:
-Roland TR707
-DSI Mopho
User avatar
fh991586
Senior Member
Senior Member
 
Posts: 964
Joined: Sun Sep 26, 2010 10:20 pm
Location: French Canada
Real name: Francis
Gear: Roland JX3P, D50, U220, MVS1, JP8080.
Korg Kaossilator, Monotrons, MicroKorg, M3R.
Yamaha Motif Rack.
TherapSid, Midines

Re: Crumar Performer - Keyboard Issues

Postby therealrx » Wed Feb 13, 2019 2:13 am

Haha. Good advice! No specific instructions in the link about how to get at the key contacts, but the pictures do help. Thanks for the help!
therealrx
Newbie
Newbie
 
Posts: 2
Joined: Thu Jan 31, 2019 3:19 pm

Previous

Return to HELP!

Who is online

Users browsing this forum: No registered users and 13 guests