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Service Mode Adjustments
Items 14-17, 19-21 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) Select No. 14 RBIAS (Red Bias), No, 15 GBIAS (Green Bias), and No. 16 BBIAS (Blue Bias) and set each data to 0
by pressing the VOLUME + or - key.
(5) Select No. 17 RDRIV (Red Drive) and No. 19 BDRIV (Blue Drive) and set each data to 64 by pressing the VOLUME
+ or - key.
(6) Turn Screen Control on the FBT (T471) to minimum (fully counter-clock-wise).
(7) Select No. 20 (1-line appear).
(8) Advance Screen Control clockwise to obtain just visible one colour line. If line does not appear, place this control to
maximum (fully clockwise).
(9) Raise each Bias Level with 1, 2, 5, 6, 9 and 0 keys to obtain just visible white line.
(10) Select No. 21 DRV (Drive Adjustments).
(11) Adjust Red and Blue Drive Levels alternately with 3, 4, -/-- or RECALL key to produce normal black an white
picture in highlight areas.
(12) Check for proper grayscale at all brightness levels. To turn off the TV Service Menu display, press the MENU key.
Note: If the Grayscale adjustment is made after picture tube replacement, check the High Voltage
Red Bias +
TIMER
Red Bias -
Red Drive +
Green Bias -
Blue Bias +
CH SCAN
TV/AV
P
P
MENU
-/--
-/--
CH
CH
SWAP
SOUND
A
B
•
BASS
PICTURE
SURROUND
S.SYS
C.SYS
JXMRM
Red Drive -
Green Bias +
Blue Bias -
Press the MENU button to exit
from service mode.
Blue Drive -
Blue Drive +
-14-
MAIN BOARD
C437
C437B
C437A
C423-H2
C423-H3
JP412
C420-H2
C420-H3
JP411
C420
JP405
J405
R477
JP477
T471A
FC3G2 CHASSIS
SCREEN VR
(Under side)
JP436
JP409
JP408
R487
1
R
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