Sony KV-G21L3 service manual Focus Adjustment, G2 Screen and White Balance Adjustments

3-3. FOCUS ADJUSTMENT

Adjust FOCUS control on the flyback transformer for the best

focus.

FOCUS

SCREEN (NOT USED)

FLYBACK TRANSFORMER (T851)

Note: Screen VR is not use.

a. AN ITEM OF ADJUSTMENT

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 the 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.

KV-G21L3

RM-883

DATA

09 RDR 1 F SERVICE

Adjustment Item

Item number

0

Executes the writing

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.

177±2V

0 V

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 1and 4and adjust the level with 3 and 6 for the best white balance.

6)Write into the memory by pressing [MUTING] then - .