Table of Contents
Advertisement
Alignment and Adjustments
5-4 RF AGC Adjustment
1. Tune to the strongest local station.
2. Turn the AGC control fully clockwise (VR111, on the IF board).
5-5 FOCUS Adjustment
1. Inputa
black and white signal.
2. Adjust the tuning control for clearest picture.
3. Adjust the FOCUS control for well defined scanning lines in the center area of the screen.
5-6 SCREEN Adjustment
1, Turn to the ACTIVE channel.
2. Adjust the VR screen for a normal picture is (no blooming or flyback line).
5-7 Purity Adjustment
Warm up the receiver for at least 20 minutes.
Plug in the CRT deflection-yoke. Tighten the
clamp screw.
N
3. Plug the convergence yoke into the CRT and
set it as shown in Fig. 5-1.
4. Input a black and white signal.
5. Fully demagnetize the receiver by using an
external degaussing coil.
6. Turn the CONTRAST and BRIGHTNESS
controls to maximum.
7. Loosen the clamp screw holding the yoke.
Slide the yoke backward or forward to
produce a vertical green belt. (Fig. 5-2),
Tighten the convergence yoke.
9. Slowly move the deflection yoke forward.
Adjust for the best overall green screen.
10. Temporarily tighten the deflection yoke.
11. Produce blue and red rasters by adjusting
the -low-light controls. Check for good purity
in each field.
12. Tighten the deflection yoke.
Alignment and Adjustments
4 Pole Magnet
2 Pole Magnet
6 POLE
CONVERGENCE
4 POLE
CONVERGENCE
Fig. 5 -1 Convergence Magnet Assembly
Vertical Green Belt
Fig. 5-2 Center Convergence Adjustment
Advertisement
Table of Contents
