SERVICE CONTROL ADJUSTMENT
B1 POWER SUPPLY ADJUSTMENT6. Set screen VR for one colour to be just visible.
1. Set VR641 to be mechanical centre before pressing[BIAS VR ADJUSTMENT]
the main switch.7. By using VR601, VR611 or VR621, adjust line to be
2. Tune the receiver to PAL circular pattern.white.
3. Set brightness and contrast controls to normal.8. Set screen mode OFF, how to set refer to "service
4. Connect digital V-meter to test point "TP-B".mode"
5. By using VR641, adjust voltage to 130 ? 0.5 V.[DRIVE VR ADJUSTMENT]
9. By using VR602 and VR612, adjust white balance.
SW1901SW1902SW1903SW1904VR641
Prog.+Prog.-Vol.+Vol.-
HIGH VOLTAGE & WIDTH ADJUSTMENT
[HIGH VOLTAGE ADJUSTMENT]
1. Tune the receiver to circular pattern.
Q681
IC8012. Set brightness and contrast controls to maximum.
CPU
3. Connect digital V-meter to both terminals of R224, and
SW601 Main switchT481 RC Transformer
high voltage meter to CRT anode.
Q641
VR641 +B ADJ.4. Confirm high voltage to be 25.0 ? 1 KV at beam
current 1.1mA, and less than 28.0 KV at 0 beam
F601 Fuse611o-coupler
current.
AFT ADJUSTMENT[H-WIDTH ADJUSTMENT]
1. Tune the receiver to the clearest station. 5. If H-width is too wide orJ213
2. By using T141, adjust AFT to obtain the best picture.narrow, connect or
4
Q
disconnect a lead wire
T141
TP-B
J213.Q461T611 Converter T
-
TP6. Reconfirm high voltage.
IC651 +12VIC652 +8VT141H-CENTRE ADJUSTMENT
1. Tune the receiver to circular
IC201pattern.
IF/Video/Croma/Def.SIF Board
J213
2. Adjust H-centre by using
Q501T451 Flyback Transformer
VR361 H-CentreVR361.
IC271 1H DelayVR131 AGC
VR501 V-Size
IC501 V-OutoutIC281
Q432 H-OutputV-CENTRE ADJUSTMENT
T101TP-E
SW501 V-Centre1. Tune the receiver to circular pattern.
2. Adjust V-centre by using SW501.
Q-SOUND Board
A101 Tuner
IC1202 Int./Ext. SW.IC1201 AV2 SW.V-SIZE ADJUSTMENTScart 2Scart 1
1. Tune the receiver to circular pattern.
2. Adjust V-size by using VR501.
AGC ADJUSTMENTVR131
NOTE: Do not attempt this adjustment with weakFOCUS ADJUSTMENT
signal.By using FOCUS VR, adjust focus control for good
1. Tune the receiver to the clearest station.scanning lines.
2. Set AGC VR(VR131) in direction which causes snow
d
noise to appear, then in the opposite direction until
IC201
IF/Video/Croma/Def.SIF Boar
snow noise just disappears.
Q501
VR361 H-Centre
GREY SCALE ADJUSTMENTIC271 1H DelayVR131 AGC
VR501 V-Size
IC501 V-OutoutIC281
Q432 H-Output
T101
[SCREEN VR ADJUSTMENT]TP-E
SW501 V-Centre
1. Tune the receiver to the white pattern.
2. Set brightness and contrast controls to normal.Q-SOUND Board
3. Set VR602and VR612 to be mechanical centre.Scart 2Scart 1A101 TunerIC1201 AV2 SW.
IC1202 Int./Ext. SW.
4. Turn VR601, VR611 and VR621 fully counter-
clockwise.
5. Set mode to one horizontal scanning line, how to set
refer to "service mode"SW501VR501VR361
-7-
F7JGV |
ACEC
