Sanyo CP21FS2, Service Manual

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Service Adjustments
Following adjustments are not required to readjust when replacing the memory IC.
Note: +B (+135V) 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 26.5 KV and 28.5 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 30.0 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
3 4
2 1
E
7
10
9
E E
C629
R628
R629
JP412
T471-H1
KDY-6
KDY-3
D466
JP403
R422
R435
R423
JP410
T471-H2
L462
JP435
L441A
L441
KDY
JP436
C450 R450
C437
R482
D489
D464
R487
D465
70
C355
C463
R470 R471
R421
L403
J406
R473
D460
R466
L462A
C465
D461
R462
C467
D441
R442
R441
R445
L461 L461A
J404
L442A
R103
L442-H2
L442-H1
L462-H2
L462-H1
L462-H3
L441-H3
L441-H1
D610
J422
C691
J647
Q462
J407
C434
C432
R525
VR631
R636
R635
D686
JW7
JW8
D353
D421
R355
L441-H2
J405
JP442
J424
J425
J409
C524
C44
C44
T431A
T431-H3
T431-H1 T431-H2
T431-H4
T431
C641-H2
8 9
10
Q461
Q461A
+B ADJST.
D43
D439
JP441
T611-H10
T611-H8
T611-H11
Q432
C425
C424
J423
R427
R405
J411
T611A-H10 T611A-H11
T611A-H8
J413
R410
R411
Q405
J414
R408
J415
Q406
J403
J416
J645
611-H7
A-H7
L442
JW10
W12
KDY-5
J609
605
614
R610
D613
D612
IC601-1
J421
J427
D615
616
R103A
JP416
J631
J646
R685
D687
C636
J680
JP442A
JP441A
J417
C437A
JW17
JW18
(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 135 ± 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
E
E E
JP409
R488
JP412
T471-H5
T471-H1
JP408
R
R422
R424
R435
R423
JP410
JP411
T471-H2
C471
R481
T471-H7
T471-H6
T471-H4
T471-H8
T471-H10
JP435
R477
R474
R481A
JP407
C450 R450
C437
R482
C482
D489
5
C470
3
R470 R471
R421
R473
0
R466
C465
R442
L461
L461A
L442A
L442-H2
L442-H1
R52
5
J405
JP442
C524
Q461
JP414
C468
Q402
J410
R405
R410
R411
Q405
J414
R408
J415
Q406
J403
TP-B
J416
L442
J427
JP416
J417
C437A
Focus VR
(Upper side)
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