G2 (Screen) And White Balance Adjustment - Sony TRINITRON KV-ES38M31 Service Manual

5-5. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1. G2 (SCREEN) ADJUSTMENT
1) Set the PICTURE and BRIGHTNESS to normal.
2) Put to VIDEO input mode without signals.
3) Connect R, G and B of the C board cathode to the oscillo-
scope.
4) Adjust BRIGHTNESS to obtain the cathode voltage to the
value below.
5) Whilst watching the picture, adjust the screen VR (RV9002)
located on the C board to the point just before the flyback
return lines disappear (to the point before cut-off)
2. WHITE BALANCE ADJUSTMENT
1) Set to Service Mode (Refer Section 6-1: ADJUSTMENTS
WITH COMMANDER).
2) Input white raster signal.
3) Set the following condition.
PICTURE minimum, BRIGHTNESS 50%
4) Select GCT (WHB 7) and BCT (WHB 8) with
[3]
and adjust the level with
balance.
5) Set the PICTURE to maximum.
6) Select GDR (WHB 4) and BDR (WHB 5) with
[3]
and adjust the level with
balance.
7) Write into the memory by pressing
170 V ± 2 (VDC)
0 V
[1] [4]
and
[6]
and for the best white
[1] [4]
and
[6]
and for the best white
[MUTING] [0]
then .
– 45 –
KV-ES38M31/ES38M61/ES38M90/ES38M91
3. SUB PICTURE BRIGHTNESS ADJUSTMENT
1) Tune RF PAL white signal at program No. 1 and No. 2.
2) Select "TWIN PICTURE" mode.
3) Receive different RF PAL white signals in MAIN and Sub
picture.
4) Adjust RV3300 on A PWB, so that the output from the 17 pin
and 20 pin of the CN1180 becomes within the spec.
CVBS 1
17 pin
CVBS 2
20 pin
,
Spec: |A - B| ≤ ± 20mV
,
MAIN
A
SUB
B
RM-916