KV-BT21M80 (serv.man3) - Sony TV Service Manual (repair manual). Page 11

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SCREEN

FOCUS

165 

± 2VDC

FOCUS adjustment should be completed before the W/B
adjustment:
1. Receive digital monoscope pattern.
2. Set picture mode: DYNAMIC.
3. Adjust focus VR to obtain a just focus at the center of

the screen.

4. Change receiving signal to white pattern and blue

back.

5. Confirm MAGENTA RING is not noticeable. Incase

magenta ring is obvious, then adjust FOCUS VR to
balance magenta ring and FOCUS.

1. Set the PICTURE & BRIGHTNESS to STANDARD.
2. Put the Video input mode signal.
3. Connect R,G,B of the C board cathode to

oscilloscope.

4. Adjust Brightness to obtain the cathode value to

value below.

5. Adjust G2 (screen) on the FBT until picture shows

the point before cut off.

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

ADJUSTMENTS WITH COMMANDER)

2. Input white raster signal.
3. Set Picture to <DYNAMIC mode>
4. Select RDRV (02) with 1 and 4 and fixed the value

to 25 with 3 and 6.

5. Adjust WHBL GDRV (03) and BDRV (04) with 1 and

4 and adjust the data with 3 and 6 for best white
balance in Highlight condition.

6. Write into the memory by pressing [MUTING] then -.
7. Adjust WHBL BKOR (00) and BKOG (01) with 1 and

4 and adjust the level with 3 and 6 for best white
balance cut-off condition.

8. Write into memory by pressing [MUTING] then -.
9. US model need to apply only for colour temperature

in Neutral.

1. Set to service mode.
2. Brightness set to 50%, Picture....Minimum
3. Select WHBL SBRT (10) with 1 and 4 and adjust

SBRT (10) data with 3 and 6 so that the third
stripe from right dimly lit.

4. Write into the memory by pressing [MUTING] then -.
5. GA models Cut-off

: 10 IRE

Slightly Glimmer : 20 IRE