One question though. If someone were going to try this they should make sure the Mac is off and unplugged, right?
Douglas Aalseth Shoreview, MN On Thursday, June 19, 2003, at 02:07 PM, Tom Lee wrote:
It seems to me that oneside of the CRT is taller than the other. The left side measures higher than the right or vice-versa. I've actually measured this with a soft tape measure to verify that it was true. I am unsure as to where the problem lies.
If there's any kind of adjustment that I need to make let me know.
I seem to remember that you could fix this by adjusting the small levellers
on the neck of the tube. It=B9s a dangerous operation since it has to be done
with the Mac up and running. And I think you should find something about it
in the Service Manual (on Gambas site).
Assuming that you mean the display is taller on one side, rather than the actual crt,
there is a way to adjust things. There is a ring of small, square magnets around the
yoke (the coil thing that wraps around the crt's neck). Those magnets are glued in
place, and provide corrections for geometrical distortion. You merely rotate each one
to affect the display. Mark the initial positions carefully, because there are
something like 8 magnets iirc, and getting things back the way they were is damn near
impossible. Those magnets, by the way, are very close to the deflection coil
windings. If the insulation is worn, you can get a painful bite. I recommend keeping
one hand in your pocket while you adjust them. And it's best to use a long pair of
insulated pliers to do the job -- you have to reach uncomfortably close to the analog
board to adjust the magnets that control the left side of the display. It's enough of
a bother that I suspect that's why many macs left the factory with less than perfect
adjustments there.
There are also two metal rings with tabs sticking out (right by the screw that holds
the yoke on the neck). Those are centering adjustments; rotate one or the other to
center the raster. You may need to move the center point around a little bit to get
the best looking display.
--Cheers, Tom
-- Prof. Thomas H. Lee Center for Integrated Systems, CIS-205 420 Via Palou Mall Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu 650-725-3709 ph, -3383 fax
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