-16-
Service Adjustments
Following adjustments are not required to readjust when replacing the memory IC.
Note: +B (+120V) Voltage Check and Grayscale Adjustment
must be completed before attempting High Voltage Check.
(1) Connect high voltage voltmeter negative lead to
ground, and c lead to anode of picture tube.
(2) Tune receiver to an active channel and confirm TV is
operating properly.
(3) Maximize the beam current by adjusting the contrast
and brightness controls to maximum. Confirm high
voltage is within 25.5 KV and 26.5 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 29.5 KV at zero beam current.
If reading is not within range, check horizontal circuit.
No high-voltage adjustment is provided on this chassis.
HIGH VOLTAGE CHECK
18
10
1
3
4
2
1
1
16
9
E
E
C643
C641
C631
L633
D633
C633
R628
C629
D609
C613
R611
C612
C611
C615
D612
D613
R607
D611
R606
D614
C614
C616
C617
T611
L604
T611-H17
T611-H11
D610
J604
R610
T611-H8
T611A-H1
T611A-H8
C617A
T611A
L634
4
L635
R636
J610
J611
D648
VR631
R459
R477
C428
R467
R476
D422
C429
R478
C450
C482
C465
R466
R423
R422
R411
C511
C427
C427A
D469
Q406
R424
R474
L403
R482
D439
C422A
C424
C424A
C422
Q461-1
D461
D465
D464
R470
R471
R355
D466
R487
R450
Q461
Q461-H1
Q461-H2
Q461-H3
D460
R473
L461
R427
C503
C501
R511
R534
C686
C648
J641
C
J477
J631
R409
JP435
J537
J538
J648
J539
L462A
L462-H2
L462-H1
L462
L441-H2
L441-H1
L441
L441A
R629
J536
D421
C641A
C426
C641-H2
C641-H1
C441
C441A
F686
J480
R461
JW1
JW9
JW10
KD
KDY-6
TP-B
IC601-1
IC601
J605
Q405
IC501
IC501-1
J513
R510
R462
R489
Q461A-1
Q461A
J650
J649
R421
C467
R426
C355
Q425
R460
D423
Q462
C463
J424
R435
C470
JP428
J509
C501A
C610
R605
J612
R643
R512
R513
R441
(1) Connect DC meter to TP-B and the ground.
(2) Tune the receiver to an active channel and synchro-
nized picture. Select NATURAL picture mode by press-
ing the
PICTURE MODE
button on the remote control.
(3) Adjust B-voltage to be 120 ± 0.5V DC by using VR631.
B-VOLTAGE SUPPLY CHECKING
(1) Receive the 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 centre.
FOCUS ADJUSTMENT
MAIN BOARD
B-Voltage Supply Adjustment
MAIN BOARD
TP-B
A30C5
C428
R478
3
R422
R411
C427
C427A
9
R424
J472
J473
C471
R474
C437
C
4
D485
R484
C422A
C422
C420
T471-H10
T471-H8
T471-H4
T471-H6
T471-H7
T471-H2
T471-H1
T471-H5
JP435
L441-H2
L441-H1
L441
L441A
C441
C441A
T471
J474
Q425
R460
D423
J424
R435
R481
JP428
R441
Focus VR
(Upper side)
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