[sdiy] MG Chemical 8339 Rubber Keypad Repair Kit...

[Bob Weigel]

On 1/21/2013 5:18 PM, rob hukin wrote:
> Hi All,
>
> It should also be noted that whilst this kind of product works fine on single (non velocity-sensitive) keyboard membranes, they should absolutely be avoided on dual (velocity-sensitive) membranes. It is very difficult to paint a consistent, even coating, resulting in irregular velocity responses between keys (as I have found to my cost).
>
> rob.
>
>    
>> On 1/21/2013 9:41 AM, Jean-Pierre Desrochers wrote:
>>      
>>> Is there anybody who used this product
>>> with good results on small switches that have
>>> membrane with carbon contact ?
>>> That product uses silver conductive pen
>>> to 'cure' the damaged contact..
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>
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>    
yup.  The disks work swell EXCEPT probably on the a few of the new ones 
where... well I tried to CLEAN a Nord was it a while back?  It has an 
eprom chip as part of the keyboard that has some precision calibration 
data burned into it.  Even cleaning the contacts after a spill changed 
things enough to where I had to get the guy a new key movement sent over 
from Europe.  The disks have worked great on all dual contact type 
machines so far that I've used them on.  Some Yamaha's (eg. cs-2x ) have 
that silly partial hemisphere with dot in the middle design. Notoriously 
bad contacts for weather changes btw I've found. I gave up keeping that 
one in my van :-)

Anyway those you just have to buy new contacts.  Meanwhile the 
concentric ring ones (used in Kawai K1, K1-II and K4, and Kurzweil K1000 
series, and Chroma Polaris and DS8) have been so great...they always 
clean up!  So  have some spares and just haven't bothered thinking about 
it. If anyone needs those I can sell spares.

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