#Monitor Troubles!
15 messages in this thread
Hello,
I have a question for anyone out there who knows anything about
monitors, specifically Commodore's 1950 multisync monitor. I have
been using this monitor since I bought my Amiga 2000. It is used in
conjunction with a Commodore 2320 display enhancer card. Now, heres
the question… Within the last 2 weeks I have begun to notice that
my display is no longer parallel to the edges of the monitor itself.
In other words the menubar is visibly at an angle from the top edge
of the screen. If The distance from the top of the left side of the
menu bar is 2 mm from the top of the screen then the top of the right
side of the menu bar is 4 mm from the top of the screen. The same
holds true for the side and bottem of my window.
If anyone know something about this I would really appreciate hearing
from you. This kind of problem really 'bugs' me because there seems to be
no reason for it. It doesn't make sense for it to be a computer problem,
more likely a problem with the 1950 itself…..?
Thanks in Advance,
Scott Nelson
Doug,
The yoke in your monitor needs to be adjusted. If you don't know how to do
it and/or you don't know much about monitor internals don't attempt it
yourself — take it to a TV repair shop. However, if you're only talking a
2mm twist, I'd just live with it rather than paying someone a minimum
service charge.
-sja
Steve, Thanks for the info, if I could afford the repair I would but…. I
am going to have to figure this one out. Apparently there are small holes
on the bottom of the 1950's case which are for some sort of adjustment.
Maybe they can adjust the yoke… The manual doesn't mention but maybe
someone knows…. Anyways thanks for the tip! Scott P.S my
name is Scott although I do have a cousin named Doug.
Scott,
No, the "small holes" have nothing to do with the yoke! If you mess around
there yoiu WILL have a nice repair/alignment bill. The yoke is pretty much
what it sounds like, a harness on the picture tube. You must loosen the
set screw, adjust the position, tighten the set screw, all while avoid
electrocuting yourself (you touch the transformer, even with the monitor
unplugged, you'll be getting a lot of unwanted flowers).
Steve,
I understand, I think I will have to turn this over to a pro. By the way I
heard this problem can be caused by having your monitor to close to
speakers? My monitor is about 2 feet from speakers on either side but if
this is the case wouldn't similiar problems present themselves with a
stereo Tv with albeit smaller speakers much nearer to the yoke? What do you
think?
Scott,
No, a misaligned yoke is more or less a mechanical problem. If you had a
problem caused by a magnetic field (like powerful speaker magnets being too
close to your monitor) you'd be seeing a color and image distortion at the
closest point of proximity.
Steve,
Really? That's very interesting. A staff member at my local computer store
told me his theory about stereo speakers being the cause and it seemed
likey to me as my problems began about 2 1/2 weeks after I moved my monitor
to a location where my speakers are now about 2 feet away(beneath on either
side). Your information is good to here as I wasn't looking forward to
having to reconfigure all my gear (midi-studio). Plus it makes me feel a
little better knowing that perhaps I didn't cause the problem.;>)
Scott,
An easy way to find out would be to simply move the speakers and
see if your problem goes away. However, unless your speakers have rather
large magnets in them I'd doubt they are a problem if they're two feet
away.
TV's with speakers get away with that very simply…they're
designed to work in the magentic field produced by those speakers…usualy
by shielding the speaker magnets with a damping material.
Don
Don,
Thanks for your idea. I am going to move my speakers but I have a feeling
the problem is going to require a service call….Although one can hope
Scott
Scott,
Heavily localized fields, like speaker magnets, can cause the color
shifts and small-region distortions that Steve described. Although the yoke
is the most logical choice, monitors can, however, experience a smooth
raster rotation if rotated vertically through the earth's magnetic field,
too. Is your 1950 sitting flat on your computer? I would move your 1950
around to various positions before I'd go playing with the yoke,
professional or not. Moving the yoke threatens to throw off convergence,
though there are probably corrections for that. More importantly, purity
can be affected, and this get's into little strip magnets and the like,
glued to the tube to compensate for non-uniform fields created by a
particular yoke position – not recommended. You might wind up with more
annoying problems than you started with. If, however, you think it's
possible that a good rap on the monitor really did loosen the yoke, then
that might be it. BUT, make every effort to rotate the yoke without
changing its front-to-back position! It may or may not be all the way up
against the bell of the tube.
Good luck,
Karl
– via Whap!
Karl, Thanks for the info, appreciated. Scott
Scott,
Yes.. speakers can be a problem! Speakers have very powerful magnets which
can infulence the electrons spurting out of the electron guns in your
monitor. Try moving the speakers about and see what effect it has. Yokes
don't move themselves, once aligned by the factory, they should pretty much
stay put (unless the screws got loose and you jostled the monitor
somewhat).
There are speakers available that are magnetically shielded so as to not
interfere with televisions. I don't know how they shield them, but they
work. TVs with speakers in them attest to that.
– via Whap!
OTOH, maybe you'll just look like Professor Emilio Lazardo.
I just read about your problem with your monitor. As I do not have one of
f these monitors I can only talk in genral term. Many quality monitors
have adjustment pots for things such as picture size, location, linearity
and pincushion. These pots are held in place by friction. Most likely
the pincushion adjust has moved. The yoke does not move (it is locked down
to the CRT with a screw) and should not be adjusted. If it has moved you
will see many problems none of which you describe. You might try to see if
your monitor has a adjustment pot with something like "PIN" listed next to
it. Note: before attempting to adjust anything note the position of the pot
first. Hope this can help a little.
John Zumwalde
John: Thanks for the information, I am proceeding cautiously so hopefully
I will only improve the situation…
Scott Nelson ]/exit