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F7WTV
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 VR2602and 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 1.4mA, 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.
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