"Gene the Skeptic" wrote in message
...
After 5 years of good service, my ALT-217 monitor is "displaying"
sporadically (~ 2 to 3 times daily) the following problems:
1. Out of the blue, the power-on reset circuit gets triggered and the
monitor
switches off, then turns on by itself. Sometimes after that, all is
well for
a few hours, sometimes goes into a unending cycle. When this happens,
if I
turn the power off and wait a few minutes to turn it on, everything is
fine.
2. Sometimes when 1. happens, the screen adjustments are reset and I
have to
readjust the size & position, vertical & horizontal.
Has anybody any experience with this monitor? Where can I find
schematics?
Any suggestions? BTW I am an EE.
Thanks,
Gene
P.S.
1. I have already posted the message on sci.electronics.repair, but no
replies
2. Searched the web with zero results.
3. Searched the newsgroups, again, with zero results.

I would clean all the air gap spark arrestors, to make sure one of those
isn't arcing. Then I would check the pins of the power supply
connectors for micro cracks in the solder, use a 10x magifier if
necessary. If you find a loose one, remove the solder and wrap some 24
gauge wire around the pin and extend it out along the trace, and
resolder. You'd be surprised at how many pieces of equipment go bye-bye
because of this problem.

If this doesn't cure it and you have something else wrong, you might try
some freeze spray to see if it's a thermal problem. Re-xposting to SER.