G2 (Screen) And White Balance Adjustment - Sony TRINITRON KV-AR25M81A Service Manual

KV-AR25M81A
RM-952
2-4. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1. G2 (SCREEN) ADJUSTMENT
1) Set the PICTURE to normal.
2) Put to VIDEO input mode without signals.
3) Connect R, G and B of the C6 board cathode to the
oscilloscope.
4) Adjust BRIGHTNESS to obtain the cathode voltage to the
value below.
5) Adjust G2 (screen) on the FBT until picture shows the point
before cut off.
Cathode setting voltage:
180 V ± 2 (VDC)
0 V
2. WHITE BALANCE ADJUSTMENT
1) Set to Service Mode (Refer Section 3-1: ADJUSTMENTS
WITH COMMANDER).
2) Input white raster signal.
3) Set the PICTURE to minimum.
4) Select WHB 04 "GCT" and WHB 05 "BCT" with
, and adjust the level with
white balance.
5) Set the PICTURE to maximum.
6) Select WHB 01 "GDR" and WHB 02 "BDR" with
and adjust the level with
balance.
7) Write into the memory by pressing
3. SUB BRIGHT ADJUSTMENT
1) Set to service mode.
2) Input a staircase signal of black to white from the pattern
generator.
3) BRIGHTNESS .... 50%.
PICTURE ............ MINIMUM
4) Select WHB 07 "SBR" with
"SBR" level with
right is dimly lit.
White
– 14 –
and for the best
and for the best white
then
and , and adjust WHB 07
and so that the second stripe from the
second from the right
Black
and
and ,
.