Sanyo CE25B4-C, Руководство по обслуживанию

Страница: 8 / 20

-8-
F7PDV
B1 POWER SUPPLY ADJUSTMENT
1. Set VR641 to be mechanically centre before pressing
the mains ON/OFF switch.
2. Tune the receiver to a PAL circular pattern.
3. Set the brightness and contrast controls to normal.
4. Connect a digital V-meter to test point "TP-B".
5. Using VR641, adjust the voltage to 150 ± 0.5V.
AFT ADJUSTMENT
1. Tune the receiver to the clearest station.
2. Using T141, adjust the AFT to obtain the best picture.
AGC ADJUSTMENT
NOTE: Do not attempt this adjustment with a weak
signal.
1. Tune the receiver to the clearest station.
2. Set AGC VR(VR131) in direction which causes snow
noise just to appear, then in the opposite direction
until the snow noise just disappears.
GREY SCALE ADJUSTMENT
[SCREEN VR ADJUSTMENT]
1. Tune the receiver to the white pattern.
2. Set the brightness and contrast controls to normal.
3. Set VR2602 and VR2612 to their mechanical centres.
4. Turn VR2601, VR2611 and VR2621 fully counter-
clockwise (anti-clockwise).
5. Set the TV into service mode by pressing the Function
button on the Remote control and the Prog +
on the TV front panel. Press the Function button
on the Remote control until “SCREEN” is highlighted.
This sets up a horizontal scanning line.
6. Set screen VR so that one colour is just visible.
[BIAS VR ADJUSTMENT]
7. By using VR2601, VR2611 or VR2621, adjust the line
until it becomes white.
8. Set screen mode OFF, by pressing the Recall button
on the Remote control.
[DRIVE VR ADJUSTMENT]
9. Using VR2602 and VR2612, adjust white balance.
HIGH VOLTAGE & WIDTH ADJUSTMENT
[HIGH VOLTAGE ADJUSTMENT]
1. Tune the receiver to the circular pattern.
2. Set the brightness and contrast controls to maximum.
3. Connect a digital V-meter to both terminals of R224,
and a high voltage meter to the CRT anode.
4. Confirm high voltage to be 26.0 ± 1 KV at beam
current 1.3mA , and less than 29.0 KV at 0 beam
current.
[H-WIDTH ADJUSTMENT]
5. Adjust VR462 to obtain proper H- width .
6. Reconfirm high voltage.
H-CENTRE ADJUSTMENT
1. Tune the receiver to a circular pattern.
2. Adjust H-centre by using VR361.
V-CENTRE ADJUSTMENT
1. Tune the receiver to a circular pattern.
2. Adjust V-centre by using SW501.
V-SIZE ADJUSTMENT
1. Tune the receiver to a circular pattern.
2. Adjust V-size by using VR501.
FOCUS ADJUSTMENT
By using FOCUS VR, adjust focus control for good
scanning lines.