Repair manual

CALIBRATION & ADJUSTMENTS
5-6
6. Visually inspect the “tennis court” to make sure it’s properly centered horizontally
and vertically. Make sure the image is not tilted.
7. If the image is tilted, remove the 108 Adapter Collimation Master (#12994) and Final
Assembly Alignment Gauge (#12979) loosen the bracket on the CRT tube, then turn
the yoke to square the image with the face of the CRT (Figure 5-3).
Figure 5-3. Centering Rings
8. The displayed image should coincide with the scribed lines in the center of the gauge.
The outside image lines should fall within the two scribed lines along the perimeter
of the gauge. The image must meet the offset specifications for both vertical and
horizontal axis and tilt (Figure 5-4).