Sony bg3r chassis kv-xa34m30a Manuales De Servicio

– 27 –

Fix a Permalloy assy corresponding to the misconverged
areas.

Focus adjustment should be completed before W/B adjustment.

b

a

c

d

a-d : screen-corner
        misconvergence

a

b

c

d

Permalloy assembly

1) Receive digital monoscope pattern.

2) Set "AV CONTROL" to "DYNAMIC"

3) a) Adjust FOCUS VR so that 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,

Incase magenta is very obvious, adjust a FOCUS VR to take

balance between MAGENTA RING and FOCUS.

Screen

Focus

1) Set to Service Mode (Refer Section 5-1: ADJUSTMENTS

WITH COMMANDER).

2) Input white raster signal.

3) Set the PICTURE to minimum.

4) Select GCT (WHB 4) and BCT (WHB 5) with 

[1]

 and 

[4]

,

and adjust the level with 

[3]

  and 

[6]

 for the best white bal-

ance.

5) Set the PICTURE to maximum.

6) Select GDR (WHB 1) and BDR (WHB 2) with 

[1]

 and 

[4]

,

and adjust the level with 

[3]

 and 

[6]

 for the best white bal-

ance.

7) Write into the memory by pressing 

[MUTING]

 then 

[0]

.

1) Set to service mode.

2) Input a staircase signal of black to white from the pattern

generator.

3) BRIGHTNESS .... 50%.

PICTURE ............ MINIMUM

4) Select SBR (WHB7) with 

[1]

 and 

[4]

, and adjust SBR (WHB7)

level with 

[3]

 and 

[6]

 so that the second stripe from the right

is dimly lit.

1) Set the PICTURE to normal.

2) Put to VIDEO input mode without signals.

3) Connect R, G and B of the C6 board cathode to the

oscilloscope.

4) Adjust BRIGHTNESS to obtain the cathode voltage to the

value below.

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

point before cut off.

White

second from the right

Black

Cathode setting voltage:

175 V 

± 2 (VDC)