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Service Adjustments
+B VOLTAGE ADJUSTMENT
1. Connect DC meter to TP-B and the ground.
2. Tune the receiver to an active channel and synchronized
picture. Select NATURAL picture mode by pressing the
PICTURE MODE button on the remote control.
3. Adjust B-voltage to be 130 ± 0.5V DC by using VR631.
MAIN BOARD
D606
C603
D603
C604
D604
C607
Q612
R615
D619
R622
D618
J249
R624Z
R624
J250
J251
R625
C614
L610
R627
C617
R628
R629
C641
L631
R434
C441
C441A
TP-B
FOCUS ADJUSTMENT
1. Receive a monochrome circular pattern.
2. Set the brightness to normal and contrast to maximum.
3. Adjust the focus control on the F.B.T. for the best focus on the
screen center.
T471
10
T471-H12
JP402
T471-H11
C471
FC3B
KQ
Focus VR (Upper side)
VERTICAL CENTER ADJUSTMENT
1. Receive a monochrome circular pattern.
2. Set the brightness and contrast to maximum.
3. Adjust the vertical centre of the picture with SW501.
T471
FBT.
T471
10
T471-H12
JP402
T471-H11
C471
FC3B
KQ
VR631
R644
C685
J641
D004
Q641
R682
E
R648
D683
R647
D685
J680
D684
R681
R646
R636
Q681
D686
R635
E
R639
2
1
Q661
R637
E
R638
3
4
R662-H2
D632
J640
D635
C628
C635
J638
J635
J634
C634
D634
J681
C644
J225
T611
CONVERTER
TRANS.
T611
J233
J232
J351
J636
C631
J231
J230
J350
R515
IC501-H2
R514
J505
J501
C514
D486
C1502
D468
D476
D448
R422
JP1407
R475
Vertical centre
SW501
J028
C3424
C3418
C518
C1013
R519
C520
R518
R515
IC501-H2
R514
J505
J501
C514
D486
C1502
D468
D476
D448
R422
JP1407
R475
HORIZ. WIDTH ADJUSTMENT
1. Receive a monochrome circular pattern.
2. Set the brightness and contrast to maximum.
3. If the picture is too wide, remove "C436" on the main unit.
C433
L431
J431
J436
R435
T431
H-DRIVE TRANS.
R006
D003
R688
C651
T471
FBT.
IC651
J832
J897
HIGH VOLTAGE CHECK
J224
Note: +B (+130V) Voltage Check and Grayscale Adjustment must
J223
J280
be completed before attempting High Voltage Check.
R285
1. Connect high voltage voltmeter negative lead to ground, and
connect + lead to anode of picture tube.
R352
R228
2. Tune receiver to an active channel and confirm TV is
JP183
J204
J218
operating properly.
J439
J435
3. Maximize the beam current by adjusting the contrast and
brightness controls to maximum. Confirm high voltage is with-
in 24.0 KV and 26.0 KV at maximum beam current.
4. Eliminate the beam current by adjusting the contrast and
brightness controls to minimum. Confirm high voltage does
not exceed 27.5 KV at zero beam current.
If reading is not within range, check horizontal circuit.
No high-voltage adjustment is provided on this chassis.
C3416
C3417
-14-
Q432
H-OUT
Q432-H2
C436
C436A
Q432-H5
J508
C435
C435A
J502
KDY
C437
IC501-H1
C517
R511
J503
J504
C521
C510
D512
J028
C518
R519
C436
J3401
J171
J507
C3404
JP503
J506
C3411
R510
C3416
C3424
C3418
C3417
C1013
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