-12-
Service Mode Adjustments
R486
C471
T471-H11
T471-H2
T471-H4
T471-H7
T471-H10
T471-H1
T471
R4
MAIN BOARD
SCREEN VR
(Under side)
(1) Receive a monochrome circular pattern.
(2) Set the brightness and colour to normal, contrast to maximum.
(3) Enter to the service mode.
(4) Select No. 17 RBIAS (Red Bias), No, 18 GBIAS (Green Bias), and No. 19 BBIAS (Blue Bias) and set each data to 0
by pressing the or - key.
(5) Select No. 20 RDRIV (Red Drive) and No. 22 BDRIV (Blue Drive) and set each data to 64 by pressing the VOLUME
+ or - key.
(6) Turn Screen Control on the FBT (T471) to minimum (fully counter-clock-wise).
(7) Select No. 23 (1-line appear).
(8) Advance Screen Control clockwise to obtain just visible one colour line. If line does not appear, place this control to
maximum (fully clockwise).
(9) Raise each Bias Level with 1, 2, 5, 6, 9 and 0 keys to obtain just visible white line.
(10) Select No. 24 DRV (Drive Adjustments).
(11) Adjust Red and Blue Drive Levels alternately with 3, 4, -/-- or RECALL key to produce normal black and white
picture in highlight areas.
(12) Check for proper grayscale at all brightness levels. To turn off the TV Service Menu display, press the MENU key.
Note:
If the Grayscale adjustment is made after picture tube replacement, check the High Voltage
Items 17-20, 22-24 GREY SCALE
1
2
3
4
5
6
7
8
9
0
TV/AV
TIMER
x
-/--
SWAP
CH SCAN
MENU
BASS
SOUND
S. SYS
SURROUND
PICTURE
CH
CH
A B
.
P
P
JXPSC
Red Bias -
Red Bias +
Green Bias -
Green Bias +
Blue Bias -
Blue Bias +
Press the
MENU
button to exit
from service mode.
Red Drive -
Red Drive +
Blue Drive -
Blue Drive +
SM_21-BA5V(AC6-A)AUS 7/25/06 9:24 AM Page 12
