Service Control Adjustment - Sanyo CE25DN3-B Service Manual

SERVICE CONTROL ADJUSTMENT

B1 POWER SUPPLY ADJUSTMENT
1. Set VR641 to be mechanical centre before pressing
the main switch.
2. Tune the receiver to PAL circular pattern.
3. Set brightness and contrast controls to normal.
4. Connect digital V-meter to test point "TP-B".
5. By using VR641, adjust voltage to 150 ± 0.5 V.
SW1901 SW1902
Prog.+ Prog.-
AFT ADJUSTMENT
1. Tune the receiver to the clearest station.
2. By using T141, adjust AFT to obtain the best picture.
Scart 2
AGC ADJUSTMENT
NOTE: Do not attempt this adjustment with weak
signal.
1. Tune the receiver to the clearest station.
2. Set AGC VR(VR131) in direction which causes snow
noise to appear, then in the opposite direction until
snow noise just disappears.
GREY SCALE ADJUSTMENT
[SCREEN VR ADJUSTMENT]
1. Tune the receiver to the white pattern.
2. Set brightness and contrast controls to normal.
3. Set VR602and VR612 to be mechanical centre.
4. Turn VR601, VR611 and VR621 fully counter-
clockwise.
EB4 MKII chassis
VR641
SW1904
SW1903
Vol.-
Vol.+
T141
IC201
IF/Video/Croma/Def.
Scart 1
VR131
5. Set mode to one horizontal scanning line, how to set
refer to "service mode"
6. Set screen VR for one colour to be just visible.
[BIAS VR ADJUSTMENT]
7. By using VR601, VR611 or VR621, adjust line to be
white.
8. Set screen mode OFF, how to set refer to "service
mode"
[DRIVE VR ADJUSTMENT]
9. By using VR602 and VR612, adjust white balance.
HIGH VOLTAGE & WIDTH ADJUSTMENT
[HIGH VOLTAGE ADJUSTMENT]
IC801
CPU
1. Tune the receiver to circular pattern.
2. Set brightness and contrast controls to maximum.
3. Connect digital V-meter to both terminals of R224, and
high voltage meter to CRT anode.
4. Confirm high voltage to be 26.0 ± 1 KV at beam
current 1.3, 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 circular
pattern.
2. Adjust H-centre by using
VR361.
V-CENTRE ADJUSTMENT
1. Tune the receiver to circular pattern.
2. Adjust V-centre by using SW501.
V-SIZE ADJUSTMENT
1. Tune the receiver to circular pattern.
2. Adjust V-size by using VR501.
FOCUS ADJUSTMENT
By using FOCUS VR, adjust focus control for good
scanning lines.
Scart 2
SW501
-7-
VR642
R224
IC201
IF/Video/Croma/Def.
Scart 1
VR501 VR361