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-13-
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 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-
23 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.
Service Adjustments
Red Bias -
Red Bias +
Green Bias -
Blue Bias +
Red Drive +
Green Drive -
Blue Drive +
Green Bias +
Blue Bias -
Press the
MENU
button to exit from
service mode
Red Drive -
Green Drive +
Blue Drive -
SCREEN VR
(Under side)
MAIN BOARD