[sdiy] Pro-One membrane keyboard

[Rude 66]

hey marc,

 get a black one. their buttons are better. i just got one and the
difference with the grey ones is amazing. when i only point at a knob it'll
work, instead of trying to push a hole through the mmt8 case to get it to
play..

ruud

www.bunker-records.com/rude66

----- Original Message -----
From: "mark verbos" <a0284520 at addcom.de>
To: "Grant Richter" <grichter at asapnet.net>; "synth DIY"
<synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, May 07, 2002 10:47 PM
Subject: Re: [sdiy] Pro-One membrane keyboard


> is this the same thing that makes the buttons on an Alesis MMT-8 get
> "difficult" ?
>
> i would like to solve that one, once and for all.
>
> mark
>
> Grant Richter wrote:
>
> >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
> >>
> >>
> >
> >
>
>