Focus; Screen (G2); White Balance Adjustment - Sony KV-32XBR200 Service Manual

KV-32XBR200/KV-36XBR200
( 2 ) Dynamic Convergence Adjustment
• Before starting, perform Horizontal and Vertical
Static Convergence Adjustment.
1. Slightly loosen deflection yoke screw.
2. Remove deflection yoke spacers.
3. Move the deflection yoke for best convergence as
shown below:
R G B B G R
4. Tighten the deflection yoke screw.
5. Install the deflection yoke spacers.
6. Adjust vertical red and blue convergence with
VLT (VR).
7. Adjust horizontal red and blue convergence with
YCH (VR).
(3) Screen-corner Convergence
Affix a permalloy assembly to correspond with the
misconverged areas:
b a
a-d: screen-corner
misconvergence
c d

3-3. FOCUS

Adjust FOCUS control for best picture.
B
B G R
R
G
G
R
R G B
B
B G R R G B
B R
R G B
G G
R B G R
B
b
a
c
d
FOCUS
SCREEN

3-4. SCREEN (G2)

1. Input dot pattern from the pattern generator.
2. Set the PICTURE and BRIGHT controls at normal.
3. Adjust S BRT, G CUT, B CUT in service mode with an
oscilloscope so that voltages on the red, green, and blue
cathodes are 170V + 2 V DC.
4. Observe the screen and adjust SCREEN (G2) VR on FBT
to obtain the faintly visible background of dot signal.
170 + 2 V DC
180 V dc
GND
3-5. WHITE BALANCE ADJUSTMENTS
NO. Disp.
18 GDRV Green Drive
19 BDRV Blue Drive
20 GCUT Green Cut-off
21 BCUT Blue Cut-off
29 SBRT Sub Bright
1. Input an entire white signal.
2. Set to Service adjustment Mode.
3. Set the PICTURE and BRIGHT to minimum.
4. Adjust with SBRT if necessary.
5. Select GCUT and BCUT with 1 and 4 .
6. Adjust with 3 and 6 for the best white balance.
7. Set the PICTURE and BRIGHT to maximum.
8. Select GDRV and BDRV with 1 and 4 .
9. Adjust with 3 and 6 for the best white balance.
10. After adjusting the white balance, adjust the white balance
video four as follows:
NO. Disp.
22 4GDR Green Drive
23 4BDR Blue Drive
24 4GCT Green Cut-off GCUT
25 4BCT Blue Cut-off
11. Write into the memory by pressing
— 18 —
pedestal
Item
Average
31
25
3
10
30
Calculate the
Item
Average Data
GDRV+2
BDRV +1
BCUT-1
then .