Sony KV-25F3A Service Manual ▷ View online
— 25 —
KV-25F3
•
Tilt the V.STAT magnet and adjust the static
convergence by opening or closing the V.STAT magnet.
convergence by opening or closing the V.STAT magnet.
4. If the V.STAT magnet is moved in the direction of
the a and b arrows, the red, green, and blue
points move as shown below.
points move as shown below.
1
b
a
b
a
b
B
G
R
B
G
R
2
a
a
B
G
R
b
B
G
R
b
b
a
a
b
B
G
R
B
G
R
b
3
3-2. CONVERGENCE
Preparation:
•
Before starting this adjustment, adjust the focus,
horizontal size, and vertical size.
horizontal size, and vertical size.
•
Minimize the brightness setting.
•
Provide a dot pattern.
(1)
Horizontal and vertical static convergence
1.
(Moving horizontally), adjust the H.STAT control so
that the red, green, and blue points are on top of
each other at the centre of the screen.
that the red, green, and blue points are on top of
each other at the centre of the screen.
2.
(Moving vertically), adjust the V.STAT magnet so
that the red, green, and blue points are on top of each
other at the centre of the screen.
that the red, green, and blue points are on top of each
other at the centre of the screen.
3.
If the H.STAT variable resistor cannot bring the red,
green, and blue points together at the centre of the
screen, adjust the horizontal convergence with the
H.STAT variable resistor and the V.STAT magnet in
the manner given below.
(In this case, the H.STAT variable resistor and the
V.STAT magnet influence each other)
green, and blue points together at the centre of the
screen, adjust the horizontal convergence with the
H.STAT variable resistor and the V.STAT magnet in
the manner given below.
(In this case, the H.STAT variable resistor and the
V.STAT magnet influence each other)
Center dot
R
G
B
H.STAT
V.STAT Magnet
R
G
B
RV702
RV701
C Board
SCREEN
KV-25F3
— 26 —
•
Operation of BMC (Hexapole) Magnet
•
The respective dot position resulting from moving
each magnet interact, so be sure to perform
adjustment while tracking.
Use the H.STAT VR to adjust the red, green, and blue
dots so they coincide at the centre of the screen
(by moving the dots in the horizontal direction).
each magnet interact, so be sure to perform
adjustment while tracking.
Use the H.STAT VR to adjust the red, green, and blue
dots so they coincide at the centre of the screen
(by moving the dots in the horizontal direction).
(2)
Dynamic convergence adjustment.
Preparation:
•
Before starting this adjustment, adjust the horizontal
static convergence and the vertical static convergence.
static convergence and the vertical static convergence.
1.
Slightly loosen the deflection yoke screws.
R G
B
R
G
B
R
G B
R
G
B
R
G
B
R
G
B
2.
Remove the deflection yoke spacer.
3.
Move the deflection yoke as shown in the figure
below and optimize the convergence.
below and optimize the convergence.
4.
Tighten the deflection yoke screws.
5.
Re-install the deflection yoke spacer.
V.STAT
Purity
BMC (Hexapole)
G
B
R
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
— 27 —
KV-25F3
a—d: angoli dello
schermo non in
convergenza.
schermo non in
convergenza.
a
b
c
d
(3)
Screen corner convergence.
If you are unable to adjust the corner convergence properly,
correct them with the use of permalloy assemblies.
correct them with the use of permalloy assemblies.
Permalloy
Install the permalloy assembly
for the section with fault
for the section with fault
a-d:
screen-corner
convergence defect
screen-corner
convergence defect
3-3. WHITE BALANCE
1.
Switch the set into AV mode (apply no signal to the AV
connectors).
connectors).
2.
Connect a Volt Meter to Test Point 1 on the A board.
3.
Adjust RV01 to obtain a voltage of 3.0V
±
0.3V.
1.
Input an all white signal from the pattern generator.
2.
Enter into the service mode.
3.
Enter into Picture Adjustment service menu.
4.
Select sub-contrast and adjust to 7.
5.
Select the Green Drive and adjust so that the white balance
becomes optimum.
becomes optimum.
6.
Select the Blue Drive and adjust so that the white balance
becomes optimum.
becomes optimum.
7.
Press the TV button to return to TV operation.
G2 Setting
White balance adjustment
PICTURE ADJUSTMENT
AFC mode
1
REF position
3
SCP BGR
1
SCP BGF
1
Trap Fo
7
Sub contrast
Adj
Sub colour
Adj
Sub brightness
Adj
Sub hue
Adj
Green drive
Adj
Blue drive
Adj
Green cutoff
Adj
Blue cutoff
Adj
Gamma
0
Pre / overshoot
0
Y delay
5
c
a
d
b
KV-25F3
— 28 —
SECTION 4
CIRCUIT ADJUSTMENTS
4-1. ELECTRICAL ADJUSTMENTS
5
+
+
(ON SCREEN
DISPLAY)
DISPLAY)
(DIGIT 5)
(VOLUME
+
)
(TV)
Service adjustment to this model can be performed
with the supplied remote commander RM-862.
with the supplied remote commander RM-862.
HOW TO ENTER INTO SERVICE MODE
1.
Turn on the main power switch of the set and
enter into standby mode.
enter into standby mode.
2.
Press the following sequence of buttons on the Remote
Commander.
Commander.
"TT-- " will appear in the top right corner of the screen.
Other status information will also be displayed.
Other status information will also be displayed.
3.
Press MENU on the commander to obtain the following
menu on the screen.
menu on the screen.
4.
Move to the corresponding adjustment using the
button on the commander.
button on the commander.
5.
Move the button to the right to enter the selected
adjustment.
adjustment.
6.
Turn off the power to quit the service mode when
adjustments are completed.
adjustments are completed.
TEST MENU
> Picture adjustment
Geometry
Wide
MSP
IC status
Current TV status
PICTURE ADJUSTMENT
AFC mode
1
REF position
2
SCP BGR
1
SCP BGF
1
Trap Fo
0
Sub contrast
Adj
Sub colour
Adj
Sub brightness
Adj
Sub hue
Adj
Green drive
Adj
Blue drive
Adj
Green cutoff
Adj
Blue cutoff
Adj
Gamma
0
Pre / overshoot
0
Y delay
3
GEOMETRY ADJUSTMENT
V Size
Adj
V Position
Adj
S Correction
Adj
V Linearity
Adj
H Size
Adj
H Position
Adj
Pin Amp
Adj
Pin Phase
Adj
AFC Bow
Adj
AFC Angle
Adj
EHT V
Adj
EHT H
Adj
Corner Pin
Adj
WIDE
V Aspect
47
V Scroll
31
Upper V Lin
0
Lower V Lin
0
Left Blanking
1
Right Blanking
11
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