Desperate times...
« on: June 22, 2020, 11:38:25 PM »
I really need to fix this fatar keybed for Nord Stage classic/original (can't find replacement or supplier anywhere). Seems to be an issue with the contacts itself. Tested rubber strips on other PCB and they work. Cleaned PCB, applied Stabilant 22, no dice. Cleaned again, no dice.

Should I try a thin coat of conductive paint? Any other suggestions to bring this back to life? Problem started with a few keys then grew out. Now almost entire PCB is dead. Thanks!
« Last Edit: June 23, 2020, 01:02:16 PM by jdurango »


rackmonkey

Re: Desperate times...
« Reply #1 on: June 23, 2020, 12:14:01 AM »
attachment is 404
Whether you think you can or you think you can't, you're probably right.

Re: Desperate times...
« Reply #2 on: June 23, 2020, 01:46:41 AM »
Cut aluminum tape in the shape of the contacts and just stick it on the contact, works like a charm! got this tip from a keyboard repair technician.

https://www.amazon.com/Aluminum-Tape-Foil-Professional-Contractor-Grade/dp/B01FROBUXE

That should be enough tape for a life time of repairs.
« Last Edit: June 23, 2020, 01:52:08 AM by Dualflip »

Re: Desperate times...
« Reply #3 on: June 23, 2020, 01:02:52 PM »
attachment is 404

Just re-attached.

Re: Desperate times...
« Reply #4 on: June 23, 2020, 01:04:53 PM »
Cut aluminum tape in the shape of the contacts and just stick it on the contact, works like a charm! got this tip from a keyboard repair technician.

https://www.amazon.com/Aluminum-Tape-Foil-Professional-Contractor-Grade/dp/B01FROBUXE

That should be enough tape for a life time of repairs.

LOL seriously? Wow.....I guess it makes sense! I'd imagine the adhesive could cause issues. I'll see if I can find some kind of conductive adhesive. Anyway, great solution! Thanks!!

Re: Desperate times...
« Reply #5 on: June 23, 2020, 02:33:14 PM »
LOL seriously? Wow.....I guess it makes sense! I'd imagine the adhesive could cause issues. I'll see if I can find some kind of conductive adhesive. Anyway, great solution! Thanks!!

Use it on the rubber side not on the PCB side.

TwentyTrees

Re: Desperate times...
« Reply #6 on: June 24, 2020, 02:41:17 AM »
Heck, I might just try this on a TV remote that's playing up and has resisted cleaning. Good tip!

Cut aluminum tape in the shape of the contacts and just stick it on the contact, works like a charm! got this tip from a keyboard repair technician.

https://www.amazon.com/Aluminum-Tape-Foil-Professional-Contractor-Grade/dp/B01FROBUXE

That should be enough tape for a life time of repairs.

mjrippe

Re: Desperate times...
« Reply #7 on: June 24, 2020, 01:08:58 PM »
Yup, I used this method to repair the buttons on a vintage Roland drum machine.  Read about it on some synth forum back then.  Worked like a charm.

Re: Desperate times...
« Reply #8 on: June 24, 2020, 01:52:04 PM »
Okay, but here's the strange thing, the rubber portion doesn't seem to be the issue. I'll double check, but using a known good rubber strip (works elsewhere) on known bad notes doesn't fix the problem. I will still give it a shot, but I think there's something more going on.

Nord tech support said that beyond the key matrix is a calibration chip. Supposedly each keybed is individually calibrated and programmed via the chip. Any changes (I'm guessing resistance?) could affect the calibration. They recommended a whole new keybed, which is like $500!! Ouch! Might have to just bite the bullet and buy it, but man, it'd be REEEEEALLY nice if some cheap foil, a hole punch and some glue did the trick!

hodad

Re: Desperate times...
« Reply #9 on: June 25, 2020, 12:06:36 AM »
Might be a long shot, but is there any damage to the pcb traces leading from the key contact points?  I've had issues with that in the past--admittedly with a horribly abused keyboard, so maybe it's not that likely in your case.


Re: Desperate times...
« Reply #10 on: June 25, 2020, 02:44:20 AM »

Nord tech support said that beyond the key matrix is a calibration chip. Supposedly each keybed is individually calibrated and programmed via the chip. Any changes (I'm guessing resistance?) could affect the calibration. They recommended a whole new keybed, which is like $500!! Ouch! Might have to just bite the bullet and buy it, but man, it'd be REEEEEALLY nice if some cheap foil, a hole punch and some glue did the trick!

try it on some contacts, if it works works, if not, then buy the whole thing.

fazer

Re: Desperate times...
« Reply #11 on: June 26, 2020, 10:57:13 AM »
There is a diode matrix on old keyboards that may have a diode failure.

the aluminum tape idea is definitely worth trying.  Thanks Dflip.

Whoops

Re: Desperate times...
« Reply #12 on: June 26, 2020, 09:57:50 PM »
Use it on the rubber side not on the PCB side.

I did that with an Roland SPD, but over time the adehise detaches from the rubber, I cleaned the rubber with alcohol before sticking the foil.


 

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