Service Adjustments - Sanyo CP21AF1VA Service Manual

Service Adjustments

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 VR631.
MAIN BOARD
E
E
T611-H7
Q612
Q613-H6
D616
Q613-H4
R434
C425A
C425
C432 C424A C424
T431
L432
Q432A
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
FBT
JP405
J405
R477
JP477
T471A
FC3G2 CHASSIS
Focus VR
(Upper side)
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
and brightness controls to maximum. Confirm high
voltage is within 23.0 KV and 25.0 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 26.5 KV at zero beam current.
No high-voltage adjustment is provided on this chassis.
T611 R660
R671
D671
E Q681
L651
C655 J626
T611B
D651
E
JP633
T611A
C652
R661
D439
C651
D662
JP631 D661
R665
R663
R516
J503
J501
IC501-H3
R518
J502
C515
JP409
R522
R515
JP408
R519
C514
J023
D486 J510
R487
KQ
D468
D448
(SOLDER
C449
1 D476
R475
C469
J238
Q662
VR651
J6
C540 SW5
J022
SIDE)
K1004
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