Noblex 1 113 261 05, Service Manual

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-12-
(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-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 +), CHANNEL 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.
Items 23-24 GREY SCALE
Service Adjustments with Replacing Memory IC(IC802)
T401
FBT
MAIN BOARD
SCREEN VR
(Under side)
F.B.T.
POWER
AUDIO MODE
VIDEO MODE
5
9
6
3
0
2
8
7
4
1
SURROUND
MENU
VOL VOL
CH
CH
IMAGE
DISPLAY
MUTE SLEEP
RECALL
SOUND
Red Bias -
Red Bias +
Green Bias -
Blue Bias +
Red Drive +
Blue Drive -
Blue Drive +
Green Bias +
Blue Bias -
Press the MENU
button to exit from
service mode
Red Drive -