KV-DA34M50 - Sony TV Service Manual (repair manual). Page 15

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Note
Focus adjustment should be completed before W/B adjustment.

1. Receive digital monoscope pattern.
2. Set Picture mode to "STANDARD".
3. Adjust FOCUS VR so that the center of the screen becomes

just focus.

4. Change the receiving signal to white pattern and blue back.
5. Confirm MAGENTA RING is not noticeable. In case

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

1. Receive dot/hatch pattern DRC-MF, DRC1250, DYNAMIC.
2. Turn FOCUS VR fully counter-clockwise.
3. Confirm the dot shape at the screen center. (Fig. 5-4)
4. Resume FOCUS VR.

Note
In case of turning NECK ASSY, loosen the screw 3 turns. Do not
move the position.

 OK

 Turn NECK ASSY clockwise.

 Turn NECK ASSY counter clockwise.

1. G2 (SCREEN) ADJUSTMENT
1. Set the PICTURE and BRIGHTNESS to normal.
2. Put to any signal mode.
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 Flyback Transformer to the point just before
the retrace lines disappear (to the point before cut-off).

1. Set Picture to Dynamic mode.
2. Go to Service mode and adjust SADJ "COL" from 60 to 00.
3. Fix WHBL "RDRV" to 41.
4. Fix WHBL "RCUT" to 31.
5. Adjust "GDRV" and "BDRV" for highlight.
6. Adjust "GCUT" and "BCUT" for cut-off.

(Cut-off Condition)

1. Set Picture to Dynamic mode.
2. Adjust SADJ "COL" from 00 to 100.
3. Adjust "CBOF" and "CROF" for cut-off.

Once the above adjustments have been set, change back the
SADJ "COL" data to 60 (original condition).

0 V

170v ± 2 (VDC)

a

b

c

d

Permalloy assembly