G2 (Screen) And White Blance Adjustments; Sub Picture Brightness Adjustment; G2 (Screen) Adjustment; White Balance Adjustment - Sony Trinitron KV-HS29M90 Service Manual

2-5. 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 C1 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 3-1: ADJUSTMENTS
WITH COMMANDER).
2) Input white raster signal.
3) Set the following condition.
PICTURE minimum, BRIGHTNESS 50%
4) Select GCT (WHB 8) and BCT (WHB 9) with 1 and 4, and
adjust the level with 3 and 6 for the best white balance.
5) Set the PICTURE to maximum.
6) Select GDR (WHB 5) and BDR (WHB 6) with 1 and 4,
and adjust the level with 3 and 6 for the best white bal-
ance.
7) Write into the memory by pressing [MUTING] then -.
KV-HS29M61/M90/M91, HS34M61/M90/M91, HS38M61/M90/M91
170 V ± 2 (VDC)
0 V

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 pic-
ture.
4) Adjust RV3300 on A Board, so that the output from the A8 pin
and A5 pin of the CN1180 becomes within the spec.
CVBS 1
A8 pin
CVBS 2
A5 pin
Spec: |A - B|
– 19 –
MAIN
A
SUB
B
± 20mV
RM-997