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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 140 ± 0.5V DC by using VR631.
MAIN BOARD
D632
L635
D632-H1
18
L632
16
JW09
JW02
03
J603
1
1
C609-H2
C617
D611
TP-B
C609-H1
R603
C610
R609
R604
IC601
D609
R613
R605
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
JP416
J435
R435
P435
T471-H1
R482
T471-H2
C482
T471-H4
R355
C355
53
R462
R474
D466
D461
D469
R424
All manuals and user guides at all-guides.com
C636
R635
9
10
VR631
JW04
R685
D687
R636
D686
C437
T611A
J651
T611
C617A
J650
R607
J435
R435
C616
L604
JP435
J604
D613
D612
C611
C615
R628
IC601-1
R629
R422
D614
R423
R610
T471-H10
T471-H9
T471-H8
T471-H7
T471-H5
HIGH VOLTAGE CHECK
Note: +B (+140V) 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
and brightness controls to maximum. Confirm high
voltage is within 22.0 KV and 24.0 KV at maximum
beam current.
R407
(4) Eliminate the beam current by adjusting the contrast
and brightness controls to minimum. Confirm high
J652
voltage does not exceed 25.0 KV at zero beam current.
R411
R410
Q406
If reading is not within range, check horizontal circuit.
No high-voltage adjustment is provided on this chassis.
JP416
R482
C482
Focus VR
(Upper side)
-15-
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