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Chapter 3---Service Adjustments
Model 330, 340SC, 370SC Service Manual 3-7
3.5 Horizontal Size Tracking
The horizontal width coils are factory adjusted and will not normally need
adjustment. In general, if the R and B vertical lines are within two (2) crosshatch
lines of each other, they can be brought in line with the Convergence procedure. If
the R or B horizontal size does not match G within two crosshatch lines, adjust
the Horizontal Width coils on the R and B Deflection Yokes (refer to Figure 3-1).
The width coils are mounted on a small circuit board on top of the Yoke assembly
inside a white ceramic holder and the adjustment is accessed from the opening at
the end of the ceramic holder.
WARNING!!!
To prevent possible electrical shock
when performing the width coil adjustment always wear
ANSI/ASTM 10,000 volt rated safety gloves for protection from the
high yoke voltages that are present. Make sure the gloves are not
cracked.
To adjust the horizontal size tracking:
1. Remove the rear cover and electronic module cover by removing the
2.5mm Allen screw holding the electronics module in place and tilting the
electronics module (see CAUTION! below) back to gain access to the
yoke.
CAUTION!
Remove anything plugged into the
rear electronics jacks or the plugs could be badly damaged
when the electronics module is tilted back.
2. View G and R.
3. Using the POS and arrow keys, position Red over Green so that each edge
of the pattern has the same amount of error. Adjust the Red coil until the
edges align.
4. Use a small plastic hex screwdriver to turn the red coil core (the red CRT
is on the right side looking from the rear) clockwise or counterclockwise
until the Red horizontal size matches Green.
5. Cutoff R and view G and B.
5. Use a small plastic hex screwdriver to turn the blue coil core (the blue
CRT is
on the left side looking from the rear) clockwise or counterclockwise until
the Blue horizontal size matches Green.
6. Tilt the electronics module back into place.
7. Replace the allen screw from Step 1 above.