Alignment And Adjustment - Samsung SPT51A Service Manual

5. Alignment and Adjustments
5-1 RF AGC Adjustment
1. Tune to the strongest local station.
2. Turn the AGC control fully clockwise (VR111,
on the IF board).
3. Adjust the AGC control until noise (snow)
disappears from the screen.
5-2 Screen Adjustment
1. Turn to the Active channel.
2. Adjust the VR (VR501, VR531, VR561) screen
for a normal picture is (no blooming or flyback
line).
3. Adjust the FOCUS control for well defined
scanning lines in the center area of the screen.
5-3 Horizontal Dynamic Focus
Adjustment
PREPARATION
1. Input a crosshatch pattern.
2. Cover the Red and Blue Lenses.
3. Enter "STANDARD" video mode.
4. Adjust the Green Lens for best focus.
ADJUSTMENT
Adjust VRZ01 (located on the convergence board).
Balance the left and right sides of the dynamic
focus lines.
Fig. 5-1 Balance the left and right sides
Samsung Electronics
5-4 FBT B + Voltage Adjustment
PREPARATION
1. Note: The B + voltage adjustment (FBT) is
done during the chassis check at the factory.
Perform this adjustment after Sub-Brightness
and Convergence.
2. Warm up the TV for at least for 10 minutes.
3. Input 100% white pattern.
4. Select the "STANDARD" video mode.
ADJUSTMENT
1. Connect the leads of a multimeter to GT405
(B + ) and GT406(G).
2. Set VR401 (on deflection board) to either
126.9V (for NTSC), or 125.6V (for PAL).
5-1