C013
C009
C006
C002
C003
C012
C010
C003
C050
T121
AFT
C138
X126
X127
X127
1C3431
IC101
IF /VIDEO/COLOUR/
DEF.
X101
C375
C371
VR371
H-CENTRE
VR120
AGC
A101 TUNER
TP-A
NICAM/STEREO BO
ARD
K2A
K2B
C103
C101
C102
KIG
C131
C104
SIF BO
ARD
K8H
K2L
K2M
BACK BOARD
SUB VIDEO BOARD
OARD
TP-E
K2E
C218
SW220
SERVICE
SWITCH
C205
C275
671
C671
C673
IC802
MEMORY
C810
X801
R014
IC801
CPU
TP-D
C805
C806
KOE
Q134
Q809
Q808
NORMAL
SERVICE
Q781
Q101
Q180
Q761
Q771
Q762
RED OUT
Q782
BLUE OUT
K7Y
K27E
K27V
Q772
GREEN OUT
Q153
Q152
K27B
K761
Q706
K17J
K17P
VR782
BLUE BIAS
VR762
RED BIAS
VR772
GREEN BIAS
VR781
BLUE DRIVE
VR761
RED DRIVE
C792
Grey Scale Adjustment
Main Board
CRT Board
SERVICE CONTROL ADJUSTMENTS
1. Receive the clearest station.
2. By using T121, adjust AFT to obtain the best
picture.
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.
1. Receive circular pattern signal.
2. Adjust H-centre by using VR371.
[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
be white.
8. Turn SW220 to “NORMAL” mode.
[DRIVE VR ADJUSTMENT]
9. By using VR761 and VR781, adjust white
balance.
GREY SCALE ADJUSTMENT
H-CENTRE ADJUSTMENT
AGC ADJUSTMENT
AFT ADJUSTMENT
0.01
"A"
P
DC 12.0V
AGC voltage (4.3-4.5V)
Output probe
Input probe
DC5.0V
Marker frequency
Sweep ATT
0dB=176mVrms/75
Tool A
SETTING
K3A-pin5
IC101-pin48
IC101-pin45
(Side b)
IC101-pin7
KOC-pin8
38.9MHz
20dB
IC101-pin46
and GND
Adjustment
By using T121, adjust "P" to
be maximum amplitude.
Waveform
CIRCUIT ALIGNMENTS
VIF ALIGNMENT
0.002
µ
F
75
Ω
1k
Ω
a
b
10k
Ω
Input probe
Output probe
SIF ALIGNMENT
DC 12V
AGC voltage
Output probe
Input probe
Sweep ATT
Marker Frequency
SETTING
IC3801-pin11
IC3801-pin3
IC3801-pin1
(Side b)
IC3801-pin12
10dB
38.9MHz
Adjustment
1. Adjust AGC voltage to be
"A" = 0.5Vp-p.
2. By using T3801, adjust "P"
to be equal centre line.
Waveform
P
Tool A: 0.01uF
Tools
SIF Board
VIF Alignment
C050
T121
AFT
C138
X126
X127
X127
1C3431
IC101
IF /VIDEO/COLOUR/
DEF.
X101
C375
C371
VR371
H-CENTRE
VR120
AGC
A101 TUNER
TP-A
NICAM/STEREO BOARD
K2A
K2B
C103
C101
C102
KIG
C131
C104
SIF BOARD
K8H
K2L
K2M
TP-E
C218
C205
275
Q134
Q809
Q808
MAL
SIF Alignment
T3801
IC3801
K38H2
K38H2
X3801
C3807
MAIN Board
CIRCUIT ALIGNMENTS
Oscilloscope
Input sound signal source
TV system
Deviation
Mode
SETTING
IC3401-pin5
System B/G
27kHz
Stereo
Adjustment
By using T3401, adjust
amplitude to be maximum.
Waveform
PILOT ALIGNMENT
A
1C3431
K34B
K34A
TJ3401
X3401
X3461
IC3401
IC3451
C3464
C3462
C3472
C3469
C3467
C3478
L3454
C3408
C3405
C3405
C3409
C3414
C3482
C3484
C3485
C3495 C3488
C3486
C3492
C3494
C3433
C3431
C3432
NICAM & Stereo Board
Pilot Alignment
VR1301
TP1310
VR1302
C1324
C1331
C1335
C1301
K20H
K20J
IC1302
C1318
IC1303
SUB CPU
X1301
C2512
C2511
TP1311
IC2501
BLACK LEVEL
ADJ.
IC1301
Sub Video Board
T402
FLYBACK
TRANS.
K4A
L704
L425
L461
C491
C402
Q402
T401
HORIZ DRIVE
TRANS.
C481
K4C
C486
C482
K4S
L462
Q461
Q462
C542
C543
Q541
Q542
Q531
C531
C546
K4E
C521
L502
C504
C512
Q505
Q501
SW501
V-CENTRE
UP
DOWN
KB4
K6A
IC651
C652
Q614
C651
IC611
C616
C624
C618
Q615
C621
T611
CONVERTER
TRANS.
K6G
Q631
Q616
C633
K6D
L633
Q633
POWER
DRIVE
Q634
POWER
SWITCH
Q632
IC531
R426
K4H
Q403
HORIZ.
OUTPUT
IC423
Q461
IC501
VERT.
DEF.
C506
SCREEN
FOCUS
IC481
Power & Deflection Board
1. Receive circular pattern signal.
2. Adjust V-centre by using SW501.
By using FOCUS VR, adjust focus control for well
scanning lines.
[HIGH VOLTAGE ADJUSTMENT]
1. Receive circular pattern signal.
2. Set brightness to centre and contrast to
maximum.
3. Connect a high voltage meter to CRT anode.
4. Confirm high voltage to be 30.5 ± 1 KV, and less
than 34.0KV at 0 beam current.
NOTE:
This must be done after picture size
adjustment.
1. Receive circular pattern signal.
2. Set screen mode to NORMAL.
3. Adjust right and left blanking width to be equal by
using VR1301(right) and VR1302(left).
H-BLANKING ADJUSTMENT
HIGH VOLTAGE CONFIRMATION
FOCUS ADJUSTMENT
V-CENTRE ADJUSTMENT
SERVICE CONTROL ADJUSTMENTS
