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SERVICE CONTROL ADJUSTMENTS
Main Board
R014
IC801
CPU
X801
IC802
MEMORY
TP-D
C810
C673
Q134
C671
671
C218
SERVICE
NORMAL
SW220
SERVICE
C205
SWITCH
C275
OARD
Q809
Q808
TP-E
K8H
SUB VIDEO BOARD
BACK BOARD
K2L
CRT Board
Q706
K27B
K17J
K17P
F2HT
KOE
C010
C012
C013
C003
C003
C009
C050
X126
X127
T121
C138
AFT
IC101
IF /VIDEO/COLOUR/
DEF.
X101
X127
C375
VR120
C371
AGC
VR371
H-CENTRE
C131
C104
KIG
K2M
Q152
Q153
Q781
Q782
BLUE OUT
Q101
Q180
Q762
Q761
RED OUT
K7Y
K761
Q772
GREEN OUT
Q771
K27V
K27E
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.
C792
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
8. Turn SW220 to "NORMAL" mode.
VR762
RED BIAS
[DRIVE VR ADJUSTMENT]
VR772
GREEN BIAS
9. By using VR761 and VR781, adjust white
balance.
VR781
BLUE DRIVE
VR761
RED DRIVE
-13-
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