Samsung CS3403AMNS/XSH, Service Manual, Page: 19 / 77

Alignment and Adjustments
5-2 Samsung Electronics
5-4 RF AGC Adjustment
1. Tune to the strongest local station.
2. Enter the Service Mode to make adjustments.
3. Adjust the AGC control until noise (snow) disappears from the screen.
5-5 FOCUS Adjustment
1. Input a 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 an ACTIVE channel.
2. Adjust the VR screen for a normal picture is (no blooming or flyback line).
3. Adjust the SCREEN control for well defined scanning lines in the center area of the screen.
5-7 Purity Adjustment
1. Warm up the receiver for at least 20 minutes.
2. Plug in the CRT deflection yoke. Tighten the
clamp screw.
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).
8. 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.