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

[Jean-Pierre Desrochers]

Sorry about my last post..
I forgot to say that I'm working on an old LEADER LSG-245 RF generator
front panel that has around 50 switches to be fixed..(bad carbon pad 
contacts).
http://www.arcenson.com/public/Push_button_switches/
That's the reason for all my explaination about the switches
and the importance of Bob's possible repair disks thickness.
Another difference about my switches and most
synth's is that synth membranes mostly sit on a PCB
with gold traces shorten by the carbon pads.
--> These gold traces are very flat because of the PCB.
But my switches contacts are made using the bottom
pins bent inside at 90deg very close to each other.
These are the contacts that are shorten with the carbon pad.
And (in my case) the reason because the carbon disapeared
with years of uses.(You can see the contacts shape on the carbon pad )
So Bob's repair disk thickness AND diameters are very important
to check in my case.
JP

----- Original Message ----- 
From: "Jean-Pierre Desrochers" <jpdesroc at oricom.ca>
To: "synth diy" <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, January 22, 2013 7:27 AM
Subject: Re: [sdiy] MG Chemical 8339 Rubber Keypad Repair Kit...


> Hi Bob,
>
> One very important thing about your disks
> is the thickness... The inside of my 50 switches
> to repair is very tight. The inside membrane
> that are dome shaped and contains the carbon pad
> to fix have a very small course when you push the switch down..
> The carbon pad is very close to the 2 contacts at the bottom.
> Could you measure the overall thickness AND the diameter
> of your disks for me ?
> I need these info to know if they would fit.
> Thanks
>
> ----- Original Message ----- 
> From: "Bob Weigel" <sounddoctorin at imt.net>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Monday, January 21, 2013 5:23 PM
> Subject: Re: [sdiy] MG Chemical 8339 Rubber Keypad Repair Kit...
>
>
>> 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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>>>
>>>
>> Remember... I developed the conductive film disks because the paints are 
>> flaky in short and long term performance.    You just stick the disks on 
>> after acetone cleaning the old surface.  Voila.  Better than original 
>> contact
>>
>> -- 
>> Check out sounddoctorin.com for songs, a studio tour, help
>> repairing old synthesizers and parts or thought provoking
>> articles that could help make your eternity!
>>
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