keyboard contact rubber fun

[Barry L Klein]

The rubber contact repair kit I mentioned some time ago might
be a less extensive solution as the contacts might be lower
resistance due to the embedded silver or whatever it uses.  But
I "had" this cordless phone that continued to cause trouble after
I treated the contacts - it was like the rubber leaked out this
sticky gunk that hosed the contacts up.  So if you have that
problem you need new contacts, made with a different rubber
material.

Barry

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From: 	Martin Czech[SMTP:czech at Micronas.Com]
Sent: 	Thursday, August 24, 2000 3:20 AM
To: 	synth-diy at node12b53.a2000.nl
Subject: 	keyboard contact rubber fun

In the last ten years or so the manufacturers employ more and
more contact rubber keyboard scanning. Repair people say that
these systems fail, regardless of brand name or usage.
Some people have no problems, other -like me- have a lot.

>From the engineering point of view this is crap, something
non mechanical like opto or magnetic should be far less
susceptive to dust particles, which seems to be the main
cause of grief.

Anyway, I have understood that NO cleaning procedure will
give longer periods of peace, because this rubber shit works
like a bellow, sucking in lots of dust druing key action.

Now my question:

Would it be possible to replace the crap with some reasonable
reed contacts and magnets, I mean from the scanner electronic
point of view? Reeds don't bounce much, but have certainly lower
resistance contact which could give some side effect...


m.c.