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ADJUSTMENT AND CALIBRATION PROCEDURES (continued)
5.7
CRT Alignment
Refer to Figures 5-8 and 5-9 for locations of the CRT adjustments on the lower
circuit board of the CRT assembly.
5.7.1
Set the System Power switch to STANDBY.
5.7.2
Disconnect any external serial interface cables from the back of the
monitor housing.
5.7.3
Remove the two monitor housing back cover retainer screws, and
swing open the back cover.
5.7.4
Remove the top shelf from the monitor housing and disconnect its
ground wire.
WARNING: When making adjustments to the CRT assembly, use only non-
5.7.5
Turn the System Power Switch to ON, and select a display that
occupies the full screen area.
5.7.6
Turn the contrast control fully clockwise.
5.7.7
Turn the master brightness control fully clockwise, then turn the
master brightness control counter-clockwise to a point where the
raster lines just disappear.
5.7.8
Set the contrast control for optimum screen appearance.
5.7.9
Adjust the vertical linearity control to minimize vertical distortion.
(Character height should be nearly the same at top and bottom of
screen.)
5.7.10
Set the vertical height control for a picture height of 3.75 inches.
5.7.11
Set the horizontal width control for a picture width of 5 inches.
5.7.12
Adjust the horizontal centering control to center the picture on the
screen.
5.7.13
Adjust the focus control for the sharpest possible picture.
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metallic alignment tools and be careful not to touch any of the
high voltage leads or CRT circuitry.
5-24
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NM3
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Troubleshooting
