Service Adjustments - Sanyo CM21SP81 Service Manual

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 VR631.
MAIN BOARD
D606
KG
C606
F601
TP-EE
C607-H1
C612
R622
R618
D616
J605
R616
L605
C615
Q616
R603
Q614 E E
R605
C613
R617
R609
R607
Q613
Q613-H1
R606
Q611
E
Q613A
Q613-H
R612-H2
R612 R612-H1
C608A
T471A
2 1
3
T471-H2 T471-H1
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
T471A
2 1
3
T471-H2 T471-H1
4
T471
T471-H4
5
FBT
6
8
T471-H10
7
T471-H7
T471-H8 10
12
T471-H12
11
T471-H11
C491
D485
C471 3 1
KQ
Focus VR
(Upper side)
R662
KE-1 KE-2
D685
VR631
+B ADJ.
C607
C627
R635
R637
D686
R639
R638
C607-H2
C628
T611
C610
T611-H2
C632
JP632
T611-H14
D632
T611-H4
D662
D634
C634
J633
T611-H7
T611-H10
C608
C631
TP-B
R501
L631
R525
R355
KDY-6
R441
L442
C441
KDY-5 JP442
L441-H2
KDY-4
TP-B
L631
R
R355
KDY-6
C441
KDY-5 JP442
KDY-4 L44
C441A
R435A-H1
JP436
L441A
KDY
H
R424
R422
R426
R486
D476
R423
D468
R475
D448
C469
D421
JP486
Q432-H5
DIP
VERTICAL CENTRE
(1) Receive the monochrome circular pattern.
(2) Set the brightness and contrast to maximum.
(3) Adjust the vertical centre of the picture with SW501.
D661
R661
Q661
R603
J645
Q661A
R605
C662
R617
R686
Q683 C608
C644
E
C608A
C521
C643
R643
T471A
KDY-6
1
KDY-5
1
KDY-4
V-CENTER
SW501
Vertical Cerntre Adjustment
R352
D682
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 24.0 KV and 26.5 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 28.0 KV at zero beam current.
If reading is not within range, check horizontal circuit.
No high-voltage adjustment is provided on this chassis.
-14-
Vertical centre
C632
Q683
JP632
T611-H14
C644
D632
E
T611-H4
D662
D634
C634 C521
C643
J633
T611-H7
T611-H10
C631
R643
TP-B
R501
L631
R525
R355
V-CENTER
R441
L442
C441 SW501
JP442
R352
L441-H2
D682
IC501
VERT.-OUT
D512
R519
C518
R512
J511
R511
C511
C515
C514
R522
C510
C210
JP204
R243
D249
R211
J352
27
J241
R212
C202
J468
J421
JW201