Service Adjustments - Sanyo CM29AF8XA Service Manual

Service Adjustments

B-VOLTAGE SUPPLY CHECKING
(1) Connect a 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 become 140 ± 1V DC by using
VR651.
MAIN BOARD
OUT
R644
C644
C615
C613
D611
Q611
C618A C618
E
C617
Q613-H4
R434
C434
C432 C424
C424A
TP-B
FOCUS ADJUSTMENT
(1) Receive a 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.
JP405
J216
R477
T471A
FC3A CHASSIS
Focus VR (Upper size)
VERTICAL CENTRE
(1) Receive a monochrome circular pattern.
(2) Set the brightness and contrast to maximum.
(3) Adjust the vertical centre of the picture with SW501.
D652
T611-H17
R657
T611-H16
T611-H3
R655
R652
C655
T611-H5
T611-H13
T611-H6
L651
T611-H7 T611-H12
T611-H8 T611-H11
T611
CONVERTER TRANS.
D439
C425A
C425
L432
VR651
R516
J501
J504
VERT.OUT
R518
JP409
R515
JP408
C514
R519
R522
D486
J502
R487
1 KQ
D468
D448
C449
D476
R475
C469
Vertical centre
1
.
JP409
JP408
JP405
J82
J82
FC3A CHASSIS
J82
E
Q652
J612
R671
HORIZ. WIDTH ADJUSTMENT
VR651
(1) Receive a monochrome circular pattern.
+B
(2) Set the brightness and contrast to maximum.
R663
R664
(3) If the picture is too wide, or narrow, adjust horizontal
width control (VR462) for proper width.
(4) Select several other channels and check horizontal
width.
L431
R423
22
C437
C423-H2
JP412
C420-H2
T471
FBT.
J029
J028
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 KV and 30 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 32 KV at zero beam current.
If reading is not within range, check horizontal circuit.
No high-voltage adjustment is provided on this chassis.
-16-
SW501
KDY-6
KDY-1 KDY-3
R540
C521
R516
J501
J504
R518 VERT.OUT
R515
C514
R519
R522
D486
J028
J502
R487
KQ
1
D468
D448
C449
D476
R475
C469
Q432
C441
C423
C423A
JP436
C423-H3
C468
D441
D469
C420-H3
C420
D466
R514
KDY
D438
J503 R462
KDY-6
KDY-1 KDY-3
VERT.OUT
R518
JP409
R515
JP408
JP405 C514
R519
R522
E D501
J409
Q540
J1208
J1207
J1206
J1205
D1032
J1204
J1501
J018
J029
J024
C1082
K1004
IC1401
L1501
VIDEO SW
VR462
J414
R473
C463
R461
J405
R466
J406
D461 Q461-H2 VR462
Q461
R467
H-SIZE
Q461A
C470
R469
J2
R464
D465 J4
D462
C467
C540
E
R540
Q540
C521
R516
J501
J504
J1501
J029