[SunRescue] My Sun GDM-1955 monitor is fuzzy...

[Christopher Byrne]

Mike,

If you have adjusted the convergence as much as possible, and it sounds like
you may have, then you may have a problem with deterioration of the tube
itself, either the electron guns/steering mechanisms, the shadow mask, or
the phosphor coating. All of these parts can detriorate or shift slightly
over time, expecially with heavy use, improper storage, or lots of handling.
Is the image unusually bright, unusually dark, or shifted in the color
spectrum? Or is there too little contrast? These are all signs of a failing
tube. Do the color bars in the pixels all line up properly, and are there
narrow bands of color at the eges of the screen where there should be black?
If so then you may have a beam convergence problem or your mask is slightly
out of alignment with your beams and/or phosphor placement. Unfotunately
several of these symptoms could be percieved as just being out of focus.

As far as info goes however I second the request. I have been unable to find
any good technical info on Sun monitors. I'd love to have a sony part cross
reference number because I can get great info on Sony monitors from several
sources. Anyone know of one?

Chris Byrne

-----Original Message-----
From: rescue-admin at sunhelp.org [mailto:rescue-admin at sunhelp.org]On
Behalf Of Mike Hebel
Sent: Saturday, November 25, 2000 11:26
To: Rescue at Sunhelp. Org
Subject: [SunRescue] My Sun GDM-1955 monitor is fuzzy...


I recently acquired a SUN 19" monitor, part number 365-1081-01, model number
GDM-1955A15.  There's only one problem - it's fuzzy.

So here I am on Thanksgiving weekend trying to focus it. (Yes, I have no
life.)

I've focused it as best I can using the focus pot on the flyback as well as
the front knobs and the massive grid of micro-pots on the right-hand side of
the monitor.  It still seems a little fuzzy though.

Does anybody have/can point me to a service manual for this model monitor?

No urgency on this as I have gotten it to a usable point for the moment.

Any help would be appreciated.

Thanks in advance!

Mike Hebel

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