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Service Mode Adjustments
Items 14-17, 19-21 GREY SCALE
(1) Receive the 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-14 RBIAS, 15 GBIAS, 16 BBIAS, 17 RDRIV and 19 BDRIV mode to 64.
(5) Select Item-20 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 -), 2 (Red Bias +), 5 (Green Bias -), 6 (Green Bias +), 9 (Blue Bias -) or 0 (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-21 DRV mode to enter the white balance adjusting mode.
(8) Press the 3 (Red Drive -), 4 (Red Drive +), -/-- (Blue Drive -) or RECALL (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 Bias +
1
Red Bias -
5
Green Bias -
9
Green Bias +
Blue Bias -
Blue Bias +
MENU
PIC MODE SWAP
Press the MENU
button to exit
from service
mode.
TIMER
TV/AV
2
3
4
6
7
8
0
-/--
A/B
P▲
P▼
CH SCAN
P
P
BASS
JXMPA
Red Drive -
Red Drive +
Blue Drive +
Blue Drive -
SCREEN VR
(Under side)
-13-
MAIN BOARD
T471
HO
FBT
Q
O
C
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