The very earliest OM-2's (not 2s's!) used plain contacts on the meter
switch, which were prone to poor connections -- needle jumping, etc.
Later models used "gold" plated contacts which alleviated the problem.
To correct the problem with older models, you could install the newer
switch arm (plated) on the original circuit board (un-plated), or coat
the contact pads with "conductive grease".
William Sommerwerck wrote:
>
> I can't speak for the OM-2S, but the OM-2 was flaky. The needle would
> sometimes drop abruptly, then come back up slowly. I thought it was a sample
> defect, but I've heard other owners with the same complaint.
>
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