Sanyo 28DN1 - Page 7

B1 POWER SUPPLY ADJUSTMENT
1. Set VR641 to it’s mechanical centre before pressing
the mains switch.
. Tune the receiver to a PAL circular pattern.
. Set the brightness and contrast controls to normal.
. Connect a digital V-meter to test point "TP-B".
. By using VR641, adjust the voltage to 130 + 0.5 V (for
21 inch).
By using VR641, adjust the voltage to 150 + 0.5 V (for
25 and 28 inch).
or & G PN
AFT ADJUSTMENT
1. Tune the receiver to the clearest station.
2. By using T141, adjust 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. Turn AGC VR(VR130) in direction which causes snow
noise 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 VR2601and VR2611 to its mechanical centre.
4. Turn VR2602, VR2612 and VR2622 fully anti-
clockwise.
5. Set the TV into service mode by pressing the
Function button FJ on the Remote control and
the Prog + Pgon the TV front panel. Press the
Function button FE.j 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 VR2602, VR2612 or VR2622, adjust line to
be white.
8. Set screen mode OFF, by pressing the Recall
button (-]®%) on the Remote control.
[DRIVE VR ADJUSTMENT]
9. By using VR2601 and VR2611, adjust white balance.
F2VCV
HIGH VOLTAGE & WIDTH ADJUSTMENT
[HIGH VOLTAGE ADJUSTMENT]
1. Tune the receiver to circular pattern.
2. Set the brightness and contrast controls to maximum.
3. Connect digital V-meter to both terminals of R224, and
a high voltage meter to the CRT anode.
4. Confirm high voltage to be 25.0 + 1 KV at beam
current 1.1, and less than 28.0 KV at 0 beam current
(for 21 inch).
Confirm high voltage to be 26.0 + 1 KV at beam
current 1.3, and less than 29.0 KV at 0 beam current
(for 25 inch).
Confirm high voltage to be 26.0 + 1 KV at beam
current 1.4, and less than 29.0 KV at 0 beam current
(for 28 inch).
[H-WIDTH ADJUSTMENT]
5. lf H-width is too wide or narrow, connect or disconnect
a lead wire J213(for 21 inch).
Adjust VR462 to obtain proper H- width (for 25 and 28
inch).
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.