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Service Adjustments
Following adjustments are not required to readjust when replacing the memory IC.
B-VOLTAGE SUPPLY CHECKING
(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 130 ± 1V DC by using VR651.
MAIN BOARD
C609 H2
C609-H1
C614
D614
R614
R632
C611
J606
D615
J607
R611
Q613-H5
E
Q625
R641
D619
R627
E
Q641
R642
Q642
E
R644
C644
C613
Q611
C615
E
E
Q612
Q613-H6
D616
Q613-H4
R434
C432
C424A
C424
TP-B
T431
Q432A
Q432-H3
Q432-H2
C433
Q432
L431
C355
R423
C423A
C423
B-Voltage Supply Adjustment
FOCUS ADJUSTMENT
(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.
MAIN BOARD
C442 H1
JP441A
9
H13
T611B-H12
C442-H3
C441-H3
C442-H2
C441-H2
7
J609
L612
TP-B
L613
J404
J403
C617
D611
Q432B
617
15
R433
623
Q431
T431-H1
T431-H3
T431A
E
!
R431
R624
JP431
C434
R628
R629
T431-H4
T431-H2
D654
C690
D654-H2
R625
Q653
R626
E
C657
J611
R615
J612
J605
C643
T611-H2
T611-H3
D653
T611-H4
D652
T611-H7
D671
Q681
E
L651
C655
T611B
D651
T611A
T611
C652
R661
D439
C651
C425A
C425
JP631
R665
L432
Q432-H1
C462
C442
R480
J411
C441
JP441
C486
C491
C441-H1
R442
D485
R441
R488
C487
T471
T471
R492
C420-H1
C423-H1
R481A
JP404
JP407
R435
JW1
T471-H10
T471-H1
JP435
T471-H8
T471-H2
T471-H11
T471-H7
T471-H6
T471-H4
T471-H5
JP410
JP403
R355
JP403A
R424
HIGH VOLTAGE CHECK
Note: +B (+130V) Voltage Check and Grayscale Adjustment
must be completed before attempting High Voltage Check.
(1) Connect high voltage voltmeter negative lead to
ground, and connect + 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
J619
and brightness controls to maximum. Confirm high
J618
D654-H1
C653
D861
voltage is within 23.0 KV and 25.0 KV at maximum
beam current.
Q651
E
(4) Eliminate the beam current by adjusting the contrast
and brightness controls to minimum. Confirm high
J617
R651
D664
voltage does not exceed 26.5 KV at zero beam current.
If reading is not within range, check horizontal circuit.
J621
J622
No high-voltage adjustment is provided on this chassis.
J2
R660
R671
J626
Q662
E
JP633
VR651
D662
D661
R663
J63
Q462
JP5
E
J409
R468
J410
J408
R485
R484
J406
R477A
R481
JP483
JW6
C471
Focus VR
(Upper side)
-15-
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