Focus Adjustment; G2 (Screen) And White Balance Adjustments - Sony TRINITRON KV-T25SZ8 Service Manual

3-3. FOCUS ADJUSTMENT

Adjust FOCUS control on the flyback transformer for the best
focus.
a. AN ITEM OF ADJUSTMENT
Item Adjustment
Initial DATA
number item
09 RDR
0A GDR
0B BDR
b. METHOD OF CANCELLATION FROM SERVICE
MODE
Set the standby condition (Press POWER button on the
commander) and then press POWER button again, hereupon it
becomes TV mode.
c. METHOD OF WRITE FOR MEMORY
1) Set to Service Mode.
2) Press 1 (UP) and 4 (DOWN) to select an item of
adjustments.
3) Press MUTING button and it will indicate WRITE on screen.
4) Press - button to write into memory.
d. MEMORY WRITE CONFIRMATION METHOD
1) After adjustment, pull out the plug from AC outlet, and then
plug into AC outlet again.
2) Turn the power switch ON and set to Service Mode.
3) Call the adjusted items again to confirm adjustments were made.
Focus
Note
25 WHITE POINT R
20 WHITE POINT G
20 WHITE POINT B
DATA
09 RDR 1 F SERVICE
Adjustment Item
Item number
09 RDR 1 F WRITE
3-4. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1. G2 (SCREEN) ADJUSTMENT (RV701)
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 G2 (RV701) volume to the value below.
2. WHITE BALANCE ADJUSTMENTS
1) Set to Service Mode.
2) Input an entire white signal.
3) Set the PICTURE to maximum.
4) Select RDR(09) with 1 and 4 , and then set the level to 25
with 3 and 6 .
5) Select GDR(0A) and BDR(0B) with 1 and 4
the level with 3 and 6 for the best white balance.
6) Write into the memory by pressing MUTING
– 15 –
KV-T25SZ8
MUTING
0
Executes the writing
175 V DC
0 V
and adjust
then - .
RM-870