Reliability of Sun 3/50's
Karl Kleinpaste
karl at cis.ohio-state.edu
Thu Dec 22 21:36:06 AEST 1988
karl at triceratops.cis.ohio-state.edu (Karl Kleinpaste) writes:
>In just the last couple of months, we have had rather a lot of the flyback
>transformers in our 3/50 monitors going bad.
aad at stpstn.UUCP (Anthony A. Datri) writes:
I've had more problems with monitors (2/50, 2/120, 3/50) than any other
piece of hardware. What are the symptoms of the flyback transformer going
bad?
A dead screen and a high-pitched whine. I received some extremely useful
mail yesterday from Lewis Jansen <lrj at helios.tn.cornell.edu>, detailing
what his group has learned about dealing with this problem. The short
version is that there's a high voltage line (24kv) going to the CRT; it
presses against the left side grounding shield. After being heated in the
monitor a long time, the insulation decays followed by arcing. The final
eventuality is shorting completely through, ruining the flyback. He says
they've taken to taping some folded `fish paper' onto the ground shield,
which insulates and also holds the wire out a bit from the shield.
Be CAREFUL around those high voltages, folks...
Many thanx to lrj for the pointer.
--Karl
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