Hi,
I think you can find schematics for the N1 which is the next model after the
20D10 and VERY similar.
http://fileshare.eshop.bg/index.php?...2&what=search2
the files (3) are SONY-A1.part1.rar and part2, part3 etc. You might find the
20D10 under a similar Sony model number though, the 20SE1T may be the right
one, I think they were the French models...
May help some anyway. Didn't find the 20D10 exactly but the N1 is the 20D20.
Main difference was that the D10 only worked with composite sync and had a
limited scan range (generally didn't go below 1024 x 768) where the 20D20
accepted composite, separate and probably sync on green too. And it would
sync at the lower resolutions 640 x 480 etc. too.
Hope this helps,
Ed Hall


"Sunny" wrote in message
...
I recently acquired (from the dumpster) several Sun Microsystems 20"
monitors, model GDM - 20D10, which appear to be Sony Trinitrons on the
inside. They are really nice when working properly, but were manufactured
in 1994 so probably aren't worth sinking $ into.

I'd like to get two of them running to upgrade the 17" pair I'm currently
using.

One worked reasonably well as-is, but was unusable due to severe CRT
burn-in. The others had symptoms ranging from collapsed display to failure
to power on at all.

I made inquiries about professional repair, but nobody was willing to
provide even a diagnostic estimate - they said the chassis is unreasonably
difficult to work on.

I decided to have a go myself, and experienced the difficulties first
hand - the internals are completely surrounded by multiple layers of metal
shielding, with circuit boards mounted to the inside of the shields all
over the place. It takes almost an hour of disassembly just to check the
power supply fuse, and close to another hour to dismount boards and
arrange them such that one can apply power and take measurements with any
degree of safety.

Without going into tedious detail, I've swapped parts around and now have
two working monitors with good CRTs. One is almost perfect, except for a
slight "shimmer" (not sure how else to describe it), while the other is
sharp but exhibits faint retrace lines and has the display offset to the
left about 1/2" further than can be corrected with the remote control.

It seems to me the remaining problems are minor and could probably be
corrected via internal adjustments, but there are a *lot*, mostly
unlabeled, and I'm well aware that fiddling with them to see what effect
they have is not the recommended approach. Looks like these monitors now
just need a good "tuneup".

Any suggestions on next steps? - given that obtaining a service manual is
highly unlikely, the professionals aren't interested, and my electronics
knowledge doesn't extend much past digital logic circuits?

TIA

Sunny