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Service Mode Adjustments
Items 18-24 GREY SCALE
Item
18-2
24 G
REY
(1 1 ) Rec
(1) Receive the monochrome circular pattern.
1
ve the
m
ochro
(2) Set the brightness and colour to normal, contrast to maximum.
(3) Enter to the service mode.
(4) Set each value of Item-18 RBI, 19 GBI, 20 BBI mode to 00. Set each value of Item-21 RD, 22 BD mode to 64.
(5) Select Item-24 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.
R R ed B as +
Red Bias +
Red Bias -
Red Drive +
Red Drive -
Press the MENU
button to exit from
service mode
SCA
LE
me c
ula
patte
VIDEO
MODE
1
1
4
4
7
7
RECALL
MENU
VOL
-
MUTE
AUDIO
MODE
POWER
2
2
3
3
2
2
3
3
5
6
5
6
8
9
8
9
SLEEP
0
0
IMAGE
CH▲
VOL
P▲
+
P▼
CH▼
SOUND SURROUND
DISPLAY
-15-
Green Bias +
Blue Bias +
Blue Bias -
Green Bias -
Blue Drive +
Blue Drive -
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