root@abulafi.UUCP (Gregor Bautz) (03/01/91)
You have to open the monitor. I've found an article in an old STmag which
discribes how to dow it: Get some plastic screwdrivers (metal would cause
some induction). On the main board you'll find some potentiometers and one
adjustable inductor (plastic drivers) . They have numbers on it, and i'll
give you a short explanation:
VR 602 (V.Size) for the total height
L 702 (H.Size) for the total horizontal size
VR 603 (V.Line) for vertical picture distortion
(trigger only, when objects on the edge of the screen
(upper/lower edge) aren't ok, but in the middle)
L 703 (H.Line) for horizontal picture distortion
VR 601 (V.Hold) for a 'standing' picture
changing this poti will cause the picture to run from
upper to lower edge
VR 701 (H.Center) to center the picture horizontally on the screen
VR 703 (Focus) ATTENTION! High Voltage (600V) this is for the sharpness
of the picture
VR 702 (Sub Bright) this is the default value for the brightness, don't change
it.
Last some hints:
mark the initial value with a marker
notice every steps you're doing
Have fun!
Gregor
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/ / / | gregor@cip-s01.informatik.rwth-aachen.de
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'Abulafias Chochmath ha-Zeruf war gleichzeitig Wissenschaft von der Kombination
der Lettern und Wissenschaft von der Herzensreinigung'. (Foucaultsches Pendel)
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_ | root@abulafia.UUCP
/ / / | gregor@cip-s01.informatik.rwth-aachen.de
__ / / __ - , __ | gregor@tornado.north.de
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'Abulafias Chochmath ha-Zeruf war gleichzeitig Wissenschaft von der Kombination
der Lettern und Wissenschaft von der Herzensreinigung'. (Foucaultsches Pendel)davea@col.hp.com (David E Allen) (03/05/91)
root@abulafi.UUCP (Gregor Bautz) / 3:35 am Mar 1, 1991 /
Offers a good explanation of the adjustments on the mono monitor, including:
> VR 701 (H.Center) to center the picture horizontally on the screen
Don't forget the mechanical centering rings on the yoke. They are metal rings
with tabs on them. They should be adjusted for centering before the electrical
adjustments are done. Remember the yoke has high voltage on it too (not
thousands, but hundreds). These must be experimented with, since they don't
simply adjust "up-down" or "left-right". They adjust "all-around", and must
both be played with together to get the right effect.
dave allen, colorado springschuck@mrcnext.uiuc.edu (charles bridgeland) (03/05/91)
while we're on the subject. . . since I've increased the size ofmy sm124's screen, the picture is a little unstable laterally. it varies from dead on center to right up against the left side of the crt. anything that can be done about that? -- ---------------------------------------------------------------------------- chuck bridgeland---anarchoRepublican --don't forget, we surround _them_, not the other way around" chuck@mrcnext.cso.uiuc.edu hire me so I can quit this pit. -----------------------------------------------------------------------------