Sony KV-J25MF8J Service Manual ▷ View online
– 17 –
•
Use the H.STAT VR to adjust the red, green, and blue dots so
that they coincide at the center of screen.
The respective dot position resulting from moving each
magnet interact, so be sure to perform adjustment while
tracking.
R G
B
R
G
B
R
G B
R
G
B
R
G
B
R
G
B
VM Board
VM Board
BLUE Paint
RED Paint
RED Paint
BLUE Paint
•
Operation of BMC (Hexapole) Magnet
If the red, green and blue dots are not balanced or aligned, then
use the BMC magnet to adjust in the manner described below.
1
Y separation axis correction magnet adjustment receive the
cross-hatch signal and adjust [PICTURE] to [MIN] and
[BRIGHTNESS] to [STANDARD] .
2
Adjust the Y separation axis correction magnet on the neck
assembly so that the horizontal lines at the top and bottom of
the screen are straight.
Note
1) The Red and Blue magnets should be equally far from
the horizontal center line.
2) Do not seperate the Red and Blue magnets too far.
(Less than 8 mm)
– 18 –
(2) Dynamic Convergence Adjustment
Preparation:
•
Before starting this adjustment, adjust the horizontal static
convergence and the vertical static convergence
1. Slightly loosen the deflection yoke screws.
2. Remove the deflection yoke spacer.
(3) Screen-corner Convergence
b
a
d
c
a-b:s c r r e n - c o r n e r
misconvergence
R G B
B G R
R G B
B G R
R G B B G R
R
G
B
B
G
R
B
G
R
R
G
B
B G R R G B
3. Move the deflection yoke as shown in the figure below and
optimize the convergence.
4. Tighten the deflection yoke screws.
5. Install the deflection yoke spacer.
Affix a Permalloy assy corresponding to the misconverged
areas.
areas.
b
a
d
c
Permalloy assembly
– 19 –
FLYBACK TRANSFORMER (T801)
Focus
3-3. FOCUS ADJUSTMENT
Adjust FOCUS control on the flyback transformer for the best
focus.
Item
number
37
39
3A
3B
3C
3C
Adjustment
item
SBR
GDR
BDR
BDR
GCF
BCF
BCF
Note
SUB-
BRIGHTNESS
G. Drive
BRIGHTNESS
G. Drive
B. Drive
G. CUT-OFF
B. CUT-OFF
G. CUT-OFF
B. CUT-OFF
Standard DATA
1F
2C
2C
2C
07
07
07
b. METHOD OF CANCELLATION FROM SERVICE
MODE
Set the standby condition (Press POWER button on the
commander), then press POWER button again, hereupon it be-
comes TV mode.
c. METHOD OF WRITE FOR MEMORY
1) Set to Service Mode.
2) Press 1 (UP) and 4 (DOWN), select an item of adjustments.
3) Press MUTING button indicate WRITE (RED) on screen.
4) Press ` º button to write into memory.
a. AN ITEM OF ADJUSTMENT
d. MEMORY WRITE CONFIRMATION METHOD
1) After adjustment, pull out the plug from AC outlet, and then
plug into AC outlet again.
2) Turn the power switch ON and set to Service Mode.
3) Call the adjusted items again to confirm adjustments were made.
SERVICE
MUTING
07
DATA
LCP
Adjustment Item
09
Item number
WRITE
07
LCP
09
0
Executes the writing
– 20 –
.
3-4. G2 (SCREEN) AND WHITE BALANCE
ADJUSTMENTS
1. G2 (SCREEN) ADJUSTMENT (RV701)
1) Set the PICTURE and BRIGHTNESS to normal.
2) Put to VIDEO input mode without signals.
3) Set to Service Mode.
4) Change BLU data of the item number 8C from 01 to 00 .
(To turn off Blue Back.)
5) Press MUTING , and ` 0 to write the data in the memory.
6) Connect R, G, and B of the C board cathode to the oscillo-
scope.
7) Adjust G2 (RV701) volume to the value below.
8) Re-set BLU data of the item number 8C from 00 back to 01
9) Press MUTING , and 0 to write the data in the memory.
2. WHITE BALANCE ADJUSTMENTS
1) Set to service Mode.
2) Input white raster signal.
3) Set the PICTURE to minimum.
4) Select SBR(35) with 1 and 4 , and then set the level to
minimum with 3 and 6 .
5) Select GCF(39) and BCF(3A) with 1 and 4. And adjust
the level with 3 and 6 for the best white balance.
6) Set the PICTURE to maximum.
7) Select GDR(37) and BDR (38) with 1 and 4, and adjust the
level with 3 and 6 for the best white balance.
8) Write into the memory by pressing MUTING then 0 .
170V
±
2(VDC)
0V
170 V
±
2(VDC)
3. SUB BRIGHT ADJUSTMENT
1) Set to service mode.
2) Input a staircase signal of black and white from the pattern
generator.
3) BRIGHTNESS .... RESET.
PICTURE ............ minimum
4) Select SBR(55) with 1 and 4 , and adjust SBR level with
3 and 6 so that the stripe second from the right is dimly lit.
White
Black
second from the right
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