Re: apple monitor iie (a2m6017) help.

["Michael J. Mahon" <mjmahon@aol.com>]

touchstone wrote:
> Cool, thanks for the input.  I removed the glue and resoldered the
> connections.
> Turns out the contrast pot is also flaky.  It exhibits some noise and
> drops out at
> just the right spot.  This was really bad until I took the can apart
> and ran a bunch
> of alcohol through it.  In retrospect, this was probably the issue all
> along.  When I
> would reach for the video cable, I found I was resting my other hand
> on the knob.

Bingo!

BTW, though the standard way to clean a noisy pot is to squirt some
pot cleaner in it and twist it back and forth a dozen or so times,
you can often get the job done without any pot cleaner, just by
twisting it rapidly back and forth over the dirty spot a lot.

> Anyway, without measuring the resistance directly since I've
> reassembled the
> thing, can you decipher the following.
>
> Alps (obvious)
> 82B  500Z  (not so much)

Maybe it's a 500 Ohm pot.  If you want to replace it, the best
reference is a schematic, but, failing that, measure the end-to-
end resistance with an ohmmeter (I know, it means removing the
case--but you have to do that to replace it anyway ;-).

BTW, it's unusual to have to replace a pot (unless something has
been spilled in it)--usually cleaning will restore them well enough.

> I didn't find much doing a google search.

The resistance markings on factory pots are not always clear, and
are pretty far from standardized.

-michael

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