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From: bergmann@az35.informatik.uni-stuttgart.de (Martin Bergmann)
Newsgroups: comp.sys.atari.st.tech
Subject: Re: Adjusting the SM124
Summary: The way I did it...
Keywords: SM124 Adjusting Screen
Message-ID: <8751@ifi.informatik.uni-stuttgart.de>
Date: 28 Feb 91 18:48:08 GMT
References: <27C8984D.9979@ics.uci.edu>
Sender: news@ifistg.uucp
Organization: Informatik, Uni Stuttgart, Germany
Lines: 37

To adjust the screen size of the SM124 you have to open the
monitor (Note: The wire of the built-in loud-speaker is
connected to the platine with a small socket which you've
got to pull off to get the casing open).

Then you have to look for the points on the main board that
are marked with "VSize" and "HSize" (Vertikal/Horizontal
size). By using a (plastic) screwdriver, it is possible to
readjust the screen size in both directions. This way I
have enlarged the size of my monitor screen to a good ex-
tent. Finally you should adjust the focus (can't remember
the name for it on the platine now, though) to get the 
picture sharp (this is always a compromise - either the
edges are clear or the center) and eventually you should
center the screen with HCenter (I think...).

It is all not that difficult, only you MUST BE *VERY*
CAREFUL not to get a severe electric shock and end up as a
little heap of ash on the carpet!!! There is high voltage
in some places inside the boxing, and the fact that you have
to switch the monitor on to adjust it doesn't make it easier!

The best way to do it is: 
1. Switch it off and leave it for at least 30 minutes like 
   this; also, pull off all wires;
2. Open the boxing and then connect it to the computer, THEN
   to the mains again;
3. Run something like a test screen with a rectangular pat-
   tern or a square that you can check the proportions;
4. Make your adjustments, then disconnect everything and
   WAIT for another 30 min. (the monitor contains conductors
   that keep a high voltage for a good while), then reassem-
   ble the whole lot again...

Good luck!!!   (...and don't electrocute yourselves!!!)

Martin Bergmann / bergmann@ipvr.informatik.uni-stuttgart.dbp.de