Sanyo C25EG92F Service Manual page 7

B1 POWER SUPPLY ADJUSTMENT
1. Set VR351 to be mechanical centre before pressing the main
switch.
2. Tune the receiver to the PAL circular pattern.
3. Set the brightness and contrast controls to normal.
4. Connect digital V-meter between R350 and R354.
5. By using VR351, adjust the voltage to 130 ± 0.5 V
AFT ADJUSTMENT
1. Tune the receiver to the clearest station.
2. By using L230, adjust AFT to obtain the best picture.
AGC ADJUSTMENT
NOTE: Do not attempt this adjustment a with weak signal.
1. Tune the receiver to the clearest station.
2. Set AGC VR(VR120) in the 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 control to normal.
3. Set SW220 to the "SERVICE" position.
4. Set VR602 and VR612 to be mechanical centre.
5. Turn VR601, VR611 and VR621 fully anti-clockwise.
6. Set screen VR for one colour to be just visible.
[BIAS VR ADJUSTMENT]
7. By using VR601, VR611 or VR621, adjust the line until white.
8. Set SW220 to "NORMAL" position.
[DRIVE VR ADJUSTMENT]
9. By using VR602 and VR612, adjust white balance.
HIGH VOLTAGE & WIDTH ADJUSTMENT
[HIGH VOLTAGE ADJUSTMENT]
1. Tune the receiver to the PAL circular pattern.
2. Set the brightness and contrast controls to maximum.
3. Connect digital V-meter to both terminals of R232(left
side)(+) , and a high voltage meter to the CRT anode.
4. Confirm that the high voltage is 26.0 ± 1 KV at beam current
1.1mA , and less than 29.0 KV at 0 beam current.
[H-WIDTH ADJUSTMENT]
5. If H-width is too wide or narrow, connect or disconnect a lead
wire AJ1.
6. Reconfirm high voltage.
H-CENTRE ADJUSTMENT
1. Tune the receiver to the circular pattern.
2. Adjust H-centre by using VR401.
V-CENTRE ADJUSTMENT
1. Tune the receiver to the circular pattern.
2. If picture is not in the centre, connect or disconnect a lead
wire JR012.
V-SIZE ADJUSTMENT
1. Tune the receiver to the circular pattern.
2. Adjust V-size by using VR431.
FOCUS ADJUSTMENT
By using FOCUS VR, adjust focus control for good scanning
lines.
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