On Sun, 18 May 2008 19:55:58 +1000, "For fun"
wrote:

Hi,

I have a DMM that is suffering from dim LCD segments.
I beleive that the conductive rubber betwee the PCB and the LCD is causing
the issue.
What are the recommendations of cleaning the contacts on the PCB, LCD &
rubber?

Neil.

Pure Isopropyl alcohol. Don't swab it or wipe it (the zebra strip),
but bath it quickly (swish around for 5- 10 sec. with tweezers or
chopsticks) in a small dish of IPA, then set aside to dry on an
absorbent tissue.

Swab the mating surfaces on both glass and PCB with IPA, using only
swabs which will not leach adhesive, or use a lint-free tissue
(Kim-Wipes, or Kay-Dry).

Don't use the 70% rubbing alcohol! make sure it's 97% IPA.

If you have some of the dilute Stabilant 22 contact enhancer, swab a
hint of that on the mating surfaces (glass and PCB), but NOT ON THE
ZEBRA STRIP. Then, wipe off any visible residue. Ideally, we want
nearly a mono-molecular film. Then, carefully re-assemble.

I've done a few miles of these on ARRIFlex movie cameras and
accessories (535, 435, SR3, RCU1); it's factory approved service on
supposedly IP63 displays on movie cameras which work on sets from
Antarctica to the Sahara to East LA.

HTH,
Peter
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