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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
TP-B
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
C524
JP442
L442
L442A
L461
L461A
R473
0
R466
J415
R411
JP435
J416
R410
3
R423
5
JP410
D489
R424
R474
All manuals and user guides at all-guides.com
Q402
R488
JP409
R481A
JP408
JP407
T471-H10
T471-H1
T471-H8
T471-H2
T471-H4
T471-H7
T471-H6
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 28.0 KV and 30.0 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 31.5 KV at zero beam current.
If reading is not within range, check horizontal circuit.
No high-voltage adjustment is provided on this chassis.
E
R481
C471
JP414
Focus VR
(Upper side)
-16-
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