[sdiy] Pro-One membrane keyboard

[Barry L. Klein]

try:
http://www.sandman.com/rubberb.html
http://www.caig.com/new.htm#12
http://www.chemtronics.com/catalog/catalog.cgi?action=list_products&category
=7 (cw2605)

I've used the chemtronics kit and it seems to have worked on memorymoogs.

Barry

-----Original Message-----
From: Grant Richter [mailto:grichter at asapnet.net]
Sent: Tuesday, May 07, 2002 9:27 AM
To: greg montalbano; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Pro-One membrane keyboard


The Korg Poly 6 and others have this "resistive elastometer" design.

It is no big deal.

The problem is oxygen forms a non-conductive layer of oxides on top of the
carbon impregnated plastic. It can be removed by mechanical means
(scrapping, sanding). The lay is only 0.001" thick so not much scrapping or
sanding is needed. Oxidized plastic is shiny, where as conductive plastic
has a matte finish.

I use 1 or 2 strokes of 600 grain wet or dry paper to break the oxide
barrier and restore a matte finish which is conductive. Clean with isopropyl
alcohol after sanding.

Clean the PC contact with alcohol also but do not abrade, they will
variously have gold, tin or carbon coating. But in my experience, the
problem is with the contact on the pad not the PC board.

> From: greg montalbano <greg.montalbano at ucop.edu>
> Date: Mon, 06 May 2002 08:04:50 -0700
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Pro-One membrane keyboard
> 
> Over the years, I've performed service &/or modifications on several SCI
> Pro-Ones, but the one I'm working on currently is the first I've ever seen
> with the
> infamous membrane keyboard.  There are problems with intermittent key
> response, but this thing looks so cheesy from the outside, I'm hesitant to
> take it apart.  Can anybody who's had experience with these give me some
> advice?  Is it worth the trouble to get inside?  Is there any way to
repair
> those sheet-plastic circuit traces?
> 
> --wouldn't normally be so timid, but it's not my machine;  I'm always more
> cautious with other people's equipment than I am with  my own (if I blow
up
> my own, that just gives me an excuse to buy NEW stuff).
> 
> ~G
> 
> "The music business is a cruel and shallow money trench, a long plastic
> hallway where thieves and pimps run free, and good men die like dogs.
> There's also a negative side." - Dr. Hunter S. Thompson
> 
> 
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