Repair manual

CALIBRATION & ADJUSTMENTS
5-8
IF THE ABOVE CONDITIONS ARE NOT MET, FOLLOW THESE STEPS:
1. Cut the hot melt securing the two centering rings on the yoke of the CRT
(Figure 5-3).
2. Return the Vertical Centering pot (R27) and the Horizontal Centering pot
(R7) - Figure 5-2, to their nominal (center) positions.
3. Adjust the centering rings to obtain proper Vertical and Horizontal Centering.
When centering is O.K., re-secure the centering rings using a hot glue gun.
4. Adjust R7 on the Monitor Board to fine tune Horizontal Centering (Figure 5-2).
5. Adjust R27 on the Monitor Board to fine tune Vertical Centering (Figure 5-2)
6. Adjust R48 on the Monitor Board to obtain proper Vertical Height (Figure 5-2).
Refer to the offset measurement calculations on page 5-10 for proper height.
7. Adjust R14 to obtrain proper Horizontal Width (Figure 5-2).
Refer to the offset measurement calculations on page 5-10 for proper width.
8. Adjust L11 to obtain proper Horizontal Linearity (Figure 5-2).
IF THE IMAGE IS STILL TILTED, MECHANICALLY ADJUST THE CRT AS
FOLLOWS:
1. Loosen, do not remove, the four screws that hold the CRT mount.
2. Again, bring up the “tennis court” pattern by selecting DP. GTI from the Gentest
menu.
3. Carefully move the CRT while observing the pattern on the gauge.
4. When the pattern meets the conditions shown in Figure 5-4, tighten the mounting
screws and reassemble the Digital Palette cover.
5. After tightening the mounting screws, recheck the specifications against the template
(refer to Figure 5-4).