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Service Adjustments
Items 16-23 GREY SCALE
(1) Receive a monochrome circular pattern.
(2) Set the brightness and colour to normal, contrast to maximum.
(3) Enter to the service mode.
(4) Set each value of Item-16 RBIAS, 17 GBIAS, 18 BBIAS mode to 00. Set each value of Item-19 RDRIV, 21 BDRIV
mode to 63, 20 GDRIV to 07.
(5) Select Item-22 mode to be one horizontal scanning line and turn the screen volume on the FBT to obtain just visible
one coloured line.
(6) Press the 1 (Red Bias +), 4 (Red Bias -), 2 (Green Bias +), 5 (Green Bias -), 3 (Blue Bias +) or 6 (Blue Bias -)
button to adjust the brightness of each colour until a dim white line produced. Please see the control button alloca-
tions in this mode.
(7) Select Item-23 DRV mode to enter the white balance adjusting mode.
(8) Press the 7 (Red Drive +), RECALL (Red Drive -), 8 (Blue Drive +) or 0 (Blue Drive -) button alternately to
produce normal black and white picture.
(9) Exit from the service mode.
(10) Check for proper grey scale tracking at all brightness levels.
NOTE: If the grey scale adjustment is made after picture tube replacement, check the high voltage.
Red Drive -
Red Bias +
Red Bias -
Red Drive +
Blue Drive +
Blue Drive -
Green Bias +
Blue Bias +
Green Bias -
Blue Bias -
Press the MENU button to exit
from service mode
R449A
R449
R423
R423A
3 3
T471-H11
SCREEN VR
(Under side)
-12-
MAIN BOARD
Q613-H6
TP-B
R435H1
C432
Q432-H6
C355
R433
JP476
R435H2
R355
C433
C434
T471-H3
T471-H2
T471-H1
Q432-H3
T471
C
T471-H4
Q432-H2
(FBT)
F.B.T.
T471-H5
T471A
Q432
T471-H6
H-OUT
T471-H7
T471-H10
T471-H8
T471-H9
JP487
JP486
C487
D485
Q432-H4
T
R432
Q432-H7
C465
C465A
L462H2
C
C442-H1
C424-H1
C423-H2
C425-H1
B
Q432-H1
C442-H3
E
C442-
C423-H1
C486A
L442
C420A-H1
KDY
R485
R487
Q432-H5
4
KQ
1
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