-13-
F2HT
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