G2 (Screen) And White Balance Adjustments - Sony KV-ES34N90 Service Manual

KV-ES34M61/ES34N90
RM-916 RM-958
4-5. 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 oscilloscope.
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 5-1: 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
adjust the level with
5) Set the PICTURE to maximum.
6) Select GDR (WHB 4) and BDR (WHB 5) with
adjust the level with
7) Write into the memory by pressing
http://cxema.ru
170 V ± 2 (VDC)
0 V
[1]
and
[3] [6]
and for the best white balance.
[1]
and
[3] [6]
and for the best white balance.
[MUTING] [0]
then
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
[4]
, and
[4]
, and
.
– 70 –
MAIN
A
SUB
B
Spec: |A - B| ≤ ± 20mV