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Service Adjustments
Items 28-33 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-28 RBIAS, 29 GBIAS, 30 BBIAS mode to 00. Set each value of Item-31 RDRIV, 33 BDRIV
mode to 64, 32 GDRIV to 08.
(5) Select Item-34 mode to be one horizontal scanning line and turn the screen volume on the FBT to obtain just vis-
ible 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-35 DRV mode to enter the white balance adjusting mode.
(8) Press the 7 (Red Drive +), RECALL (Red Drive -), 8 (Green Drive +) or 0 (Green Drive -) button, 9 (Blue
Drive +) or SLEEP TIMER (Blue Drive -) 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 +
Green Drive +
Blue Drive +
Green Drive -
Blue Drive -
JXMRR
-14-
6
H H
H H
5
4
Green Bias +
Blue Bias +
Green Bias -
3
Blue Bias -
Press the MENU button to exit from
service mode
2
MAIN BOARD
1
SCREEN VR
(Under side)
H H
H H
H H
H H
H
H
H
H
A
H
H
H
H
H
B
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