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Rob[_40_]

wrote:

I bought an HP 2621a CRT computer terminal in 1980. But about fifteen years
ago the screen got black spots like mildew. But it ain't mildew. Apparently
the glue holding a plastic sheet over the glass is decaying. I looked online
and found you have to peal that plastic off and remove the glue. I do have a
Zerox (ok, it was Savin then) copy of the service manual, but it says nothing
about this. Yeah, it's nostalgia and prolly not worth the effort. But would
appreciate any tips from anyone who has done anything like this before.

Of course the service manual does not mention this, it was either not
known at the time it was made or the service was not intended to cover
that long of a lifetime.

There will likely be other things wrong with it, like dried-out electolytic
capacitors or other components that decay over such a long time.
I would recommend consulting someone with experience in refurbishing
such equipment, like "Curious Marc".