KV-AR252M50 - Sony TV Service Manual (repair manual). Page 12

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1. Set the  PICTURE to Normal.
2. Put the VIDEO input mode without signals
3. Connect R,G,B of the  C board cathode to the

oscilloscope.

4. Adjust cathode voltage to the value below.
5. Adjust G2 (screen) on the FBT until picture shows the

point before cut off.

Cathode setting voltage:
170 V 

±

 2 (VDC)

FOCUS adjustment should be completed before W/B
adjustment.

(Except 34")
1. Receive digital monoscope pattern.
2. Set "Picture Mode" to "DYNAMIC".
3. a) Adjust focus VR so that the center of screen

becomes just focus(29",34").

b) Adjust focus VR so that the lion teeth

becomes just focus(25").

4. Change the receiving signal to white pattern and blue

back.

5. Confirm Magenta ring is not noticeable. Incase

magenta ring is obvious, adjust FOCUS VR to balance
between MAGENTA RING and FOCUS.

Focus

Screen

1. Set to Service Mode (Refer Section 3-1:

ADJUSTMENTS WITH COMMANDER).

2. Input white raster signal.
3. Set Picture to MINIMUM.
4. Select WHBL 002"RDRV" and adjust the value to 37
5. Select WHBL 003"GDRV" and 004 "BDRV"and adjust

the data for the best white balance in highlight
condition.

6. Adjust WHBL 000 "BKOR" and 001 "BKOG"and adjust

the data for best white balance cut-off condition.

7. Write into the memory by pressing 

[MUTING]

 then 

-

.

2-6. SUB BRIGHT ADJUSTMENT
1. Set to service mode.
2. Brightness set to 50%, Picture: Minimum.
3. Select WHBL SBRT with 

1

 and 

4

, and adjust 'SBRT'

data with 

3

 and 

6

 so that the third stripe from right

dimly lit.

4. Write into the memory by pressing 

[MUTING]

 then 

-

.

5. Models cut-off: 0 IRE (25",34"), 10 IRE (29")

Slightly Glimmer: 10 IRE (25",34"), 20 IRE (29")