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SERVICE CONTROL ADJUSTMENTS
Main Board
KOE
R014
C010
C012
IC801
C013
C003
CPU
C003
C009
X801
IC802
MEMORY
TP-D
C810
C673
Q134
C050
C671
671
C218
X126
SERVICE
NORMAL
X127
SW220
T121
C138
SERVICE
AFT
SWITCH
C205
IC101
IF /VIDEO/COLOUR/
DEF.
X101
X127
C375
C275
OARD
VR120
C371
AGC
Q809
VR371
Q808
H-CENTRE
TP-E
C131
C104
K8H
SUB VIDEO BOARD
BACK BOARD
KIG
K2L
K2M
CRT Board
Q152
C792
Q153
Q781
Q782
Q706
BLUE OUT
Q101
Q180
Q762
Q761
RED OUT
K27B
K7Y
K761
Q772
GREEN OUT
Q771
K27V
K27E
K17J
K17P
CIRCUIT ALIGNMENTS
VIF ALIGNMENT
SETTING
DC 12.0V
K3A-pin5
AGC voltage (4.3-4.5V)
IC101-pin48
Output probe
IC101-pin45
(Side b)
Input probe
IC101-pin7
DC5.0V
KOC-pin8
Marker frequency
38.9MHz
Sweep ATT
20dB
0dB=176mVrms/75
Tool A
IC101-pin46
and GND
Q134
C050
C218
X126
MAL
X127
T121
C138
AFT
C205
IC101
IF /VIDEO/COLOUR/
DEF.
X101
X127
C375
275
VR120
C371
AGC
Q809
VR371
Q808
H-CENTRE
TP-E
C131
C104
K8H
KIG
K2L
K2M
MAIN Board
SIF ALIGNMENT
SETTING
DC 12V
IC3801-pin11
AGC voltage
IC3801-pin3
Output probe
IC3801-pin1
(Side b)
Input probe
IC3801-pin12
Sweep ATT
10dB
Marker Frequency
38.9MHz
SIF Board
T3801
C3807
X3801
IC3801
K38H2
K38H2
Grey Scale Adjustment
C006
AFT ADJUSTMENT
C002
1. Receive the clearest station.
2. By using T121, adjust AFT to obtain the best
picture.
AGC ADJUSTMENT
NOTE: Do not attempt this adjustment with
weak signal.
1. Receive the clearest station.
2. Set AGC VR(VR120) in direction which causes
snow noise to appear, then in the opposite
direction until snow noise just disappears.
H-CENTRE ADJUSTMENT
1. Receive circular pattern signal.
2. Adjust H-centre by using VR371.
GREY SCALE ADJUSTMENT
[SCREEN VR ADJUSTMENT]
1. Receive white pattern signal.
2. Set brightness and contrast controls to
maximum.
3. Set VR761 and VR781 to be mechanical centre.
4. Turn VR762, VR772 and VR782 fully counter-
clockwise.
5. Turn SW220 to "SERVICE" mode.
6. Set screen VR for one colour to be just visible.
[BIAS VR ADJUSTMENT]
7. By using VR762, VR772 or VR782, adjust line to
VR782
be white.
BLUE BIAS
VR762
8. Turn SW220 to "NORMAL" mode.
RED BIAS
[DRIVE VR ADJUSTMENT]
VR772
GREEN BIAS
9. By using VR761 and VR781, adjust white
balance.
VR781
BLUE DRIVE
VR761
RED DRIVE
Adjustment
Waveform
By using T121, adjust "P" to
be maximum amplitude.
Tools
10kΩ
0.002µF
a
75Ω
b
1kΩ
Output probe
Input probe
VIF Alignment
Waveform
Adjustment
1. Adjust AGC voltage to be
"A" = 0.5Vp-p.
2. By using T3801, adjust "P"
to be equal centre line.
SIF Alignment
SERVICE CONTROL ADJUSTMENTS
Power & Deflection Board
C633
K6D
L633
Q633
POWER
DRIVE
Q634
POWER
SWITCH
K4H
L461
C491
C402
Q402
T401
Q403
HORIZ.
OUTPUT
HORIZ DRIVE
TRANS.
C481
K4C
FOCUS
Sub Video Board
TP1311
C2512
C2511
IC2501
BLACK LEVEL
ADJ.
K20J
CIRCUIT ALIGNMENTS
PILOT ALIGNMENT
P
Oscilloscope
Input sound signal source
TV system
Deviation
Mode
NICAM & Stereo Board
1C3431
C3433
C3431
X3401
C3432
IC3451
C3482
C3484
0.01
C3485
C3495 C3488
C3486
C3492
Tool A: 0.01uF
C3494
K34B
"A"
P
K6G
C621
T611
C618
CONVERTER
C624
TRANS.
K6A
IC651
Q615
C652
C616
Q614
C651
Q632
IC611
Q631
1. Receive circular pattern signal.
KB4
2. Adjust V-centre by using SW501.
Q616
Q505
IC423
R426
Q501
C506
IC501
UP
Q461
VERT.
L425
DEF.
SW501
DOWN
V-CENTRE
L704
L502
C504
C512
K4E
K4A
C521
By using FOCUS VR, adjust focus control for well
C546
scanning lines.
C531
T402
FLYBACK
Q542
Q531
Q462
TRANS.
Q461
IC531
Q541
K4S
L462
C543
C542
[HIGH VOLTAGE ADJUSTMENT]
IC481
C482
1. Receive circular pattern signal.
C486
2. Set brightness to centre and contrast to
SCREEN
3. Connect a high voltage meter to CRT anode.
4. Confirm high voltage to be 30.5 ± 1 KV, and less
NOTE: This must be done after picture size
TP1310
1. Receive circular pattern signal.
VR1301
VR1302
2. Set screen mode to NORMAL.
C1324
3. Adjust right and left blanking width to be equal by
IC1303
SUB CPU
IC1301
X1301
C1331
C1335
IC1302
C1301
C1318
K20H
SETTING
Adjustment
IC3401-pin5
By using T3401, adjust
amplitude to be maximum.
System B/G
27kHz
Stereo
C3414
IC3401
C3409
TJ3401
Pilot Alignment
C3405
C3405
L3454
C3408
C3478
X3461
C3467
C3469
C3472
C3462
C3464
K34A
V-CENTRE ADJUSTMENT
FOCUS ADJUSTMENT
HIGH VOLTAGE CONFIRMATION
maximum.
than 34.0KV at 0 beam current.
H-BLANKING ADJUSTMENT
adjustment.
using VR1301(right) and VR1302(left).
Waveform
A
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