Sony KV-T25SZ8 Service Manual ▷ View online
– 13 –
KV-T25SZ8
RM-870
3-2. CONVERGENCE
Preparation :
•
Before starting this adjustment, adjust the focus, horizontal size
and vertical size.
•
Minimize the brightness setting.
•
Provide dot pattern.
(1)
Horizontal and Vertical Static Convergence
1. (Moving vertically), adjust the V.STAT magnet so that the red,
green and blue dots in the center of the screen are separated
from each other.
2. Adjust the BMC (Hexapole) magnet so that the red, green and
blue dots are aligned in a straight line.
3. Adjust the BMC (Hexapole) magnet so that the red, green and
blue dots are balanced (ie. equal distance) on either side of the
green dot.
4. (Moving horizontally), adjust the H.STAT VR magnet so that
the red, green and blue dots converge on top of each other in
the center of the screen.
•
The respective dot positions resulting from moving each magnet
interact, so be sure to perform adjustment while tracking.
Use the V. STAT magnet to adjust the red, green and blue dots
so they coincide at the center of screen (by moving the dots in
the horizontal direction).
BMC (Hexapole)
V.STAT
Purity
•
Operation of the V.STAT magnet.
If the V-STAT magnet is moved in the direction of the a and
b arrows, the red, green and blue dots move as shown below.
b arrows, the red, green and blue dots move as shown below.
B
R
B
R
a
b
b
b
a
b
a
b
a
R
G
B
b
B
G
R
b
b
a
a
1
2
3
G
G
B G R
R G B
•
Operation of BMC (Hexapole) Magnet.
To align or balance the red, green and blue dots, adjust the BMC
(Hexapole) magnet as shown below.
R G
B
R
G
B
R
G B
R
G
B
R
G
B
R
G
B
R G B
G
R
B
Center dot
V.STAT Magnet
C board
RV 701
SCREEN (G2)
– 14 –
KV-T25SZ8
RM-870
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.
(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.
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
(3) Screen-corner Convergence
a-d : screen-corner
misconvergence
misconvergence
b
a
c
d
Fix a Permalloy assy
corresponding to the
misconverged areas
corresponding to the
misconverged areas
Permalloy assembly
a
b
c
d
– 15 –
KV-T25SZ8
RM-870
3-3. FOCUS ADJUSTMENT
Adjust FOCUS control on the flyback transformer for the best
focus.
a. AN ITEM OF ADJUSTMENT
b. METHOD OF CANCELLATION FROM SERVICE
MODE
Set the standby condition (Press POWER button on the
commander) and then press POWER button again, hereupon it
becomes TV mode.
c. METHOD OF WRITE FOR MEMORY
1) Set to Service Mode.
2) Press 1 (UP) and 4 (DOWN) to select an item of
adjustments.
3) Press MUTING button and it will indicate WRITE on screen.
4) Press - button to write into memory.
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.
Item
number
number
Note
Adjustment
item
item
Initial DATA
09
RDR
25
WHITE POINT R
0A
GDR
20
WHITE POINT G
0B
BDR
20
WHITE POINT B
SERVICE
MUTING
1 F
DATA
RDR
Adjustment Item
09
Item number
WRITE
1 F
RDR
09
0
Executes the writing
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) Connect R, G and B of the C board cathode to the oscilloscope.
4) Adjust G2 (RV701) volume to the value below.
2. WHITE BALANCE ADJUSTMENTS
1) Set to Service Mode.
2) Input an entire white signal.
3) Set the PICTURE to maximum.
4) Select RDR(09) with 1 and 4 , and then set the level to 25
with 3 and 6 .
5) Select GDR(0A) and BDR(0B) with 1 and 4 and adjust
the level with 3 and 6 for the best white balance.
6) Write into the memory by pressing MUTING
→
then - .
0 V
Focus
175 V DC
– 16 –
KV-T25SZ8
RM-870
SECTION 4
SELF DIAGNOSIS FUNCTION
If no acknowledgement is returned from a device which is turned "ON", the device has a problem.
In this case, one of the LED's responding to the problem device will flicker a defined number of times.
Flickering is operated by lighting the LED's for 60ss each time.
The flickering frequency responding to each failed device is shown below.
All the devices are checked one after another from the left of the table.
If an error is found, the responding LED will start flickering.
So, if more than 1 device have failed, only the one on the left side will flicker.
Device
Flickering
Frequency
NONVOLATILE
MEMORY
1
—
—
Y/C JUNGLE
(IC300)
3
—
—
—
—
TONE
CONTROL
(IC201)
6
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