Sony KV-J25MN1AK Service Manual ▷ View online
– 13 –
KV
-J25MN1AK
-J25MN1AK
RM-883
2-9. F1 AND H3 BOARDS REMOVAL
1
Two connectors
5
Seven connector
2
Two claws
3
F1 Board
8
H3 Board
7
Three claws
2-10. A AND F2 BOARDS REMOVAL
4
A Board
3
Five claws
1
Five claws
2
F2 board
2-11. PICTURE TUBE REMOVAL
1
Two screws
(washer head)
(
(
+
BVTP 4
×
16)
1
Two screws
(washer head)
(
(
+
BVTP 4
×
16)
!¢
Two screws
(Tapping)
!¢
Two screws
(Tapping)
!™
DGC
!¡
Two DGC clips
0
Two DGC band
6
C Board
9
Two DGC holder
!¡
Two DGC clips
7
Neck assy
!™
DGC
8
Deflection yoke
!£
Tension spring
4
Anode cap
Cushion
2
Speaker
bracket(L)assy
2
Speaker
bracket(R)assy
3
Speaker (5cm)
3
Speaker (5cm)
!∞
Picture tube
5
Chassis assy
– 14 –
KV
-J25MN1AK
-J25MN1AK
RM-883
•
REMOVAL OF ANODE-CAP
NOTE : After removing the anode, short circuit the anode of the picture tube and
the anode cap to the metal chassis, CRT shield or carbon paint on the
CRT.
CRT.
•
REMOVING PROCEDURES
1
Do not damage the surface of anode-caps with sharp shaped objects.
2
Do not press the rubber too hard so as not to damage the inside of anode-cap.
A metal fitting called the shatter-hook terminal is built into the rubber.
A metal fitting called the shatter-hook terminal is built into the rubber.
3
Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage the rubber.
The shatter-hook terminal will stick out or damage the rubber.
•
HOW TO HANDLE AN ANODE-CAP
3
When one side of the rubber cap is separated from the anode button, the anode-cap
can be removed by turning up the rubber cap and pulling it up in the direction of the
arrow
can be removed by turning up the rubber cap and pulling it up in the direction of the
arrow
c
.
2
Using a thumb pull up the rubber cap firmly in the direction indicated by the arrow
b
.
1
Turn up one side of the rubber cap in the direction indicated by the arrow
a
.
b
b
c
Anode button
a
a
– 15 –
KV-J25MN1AK
RM-883
•
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
•
These adjustments should be performed with rated power
supply voltage unless otherwise noted.
Controls and switch should be set as follows unless otherwise noted:
PICTURE control ........................................................... normal
BRIGHTNESS control ................................................... normal
Perform the adjustments in the following order:
1. Beam Landing
2. Convergence
3. Focus
4. White Balance
Note : Test Equipment Required:
1. Color-bar/Pattern Generator
2. Degausser
3. Oscilloscope
SECTION 3
SET-UP ADJUSTMENTS
.................................................................................................................................................................................................................................
Fig. 3-4
Fig. 3-3
Fig. 3-2
}
normal
Preparation :
•
In order to reduce the influence of geomagnetism on the set's
picture tube, face it east or west.
•
Switch on the power and degauss with the degausser.
3-1. BEAM LANDING
1. Input a white signal with the pattern generator.
Contrast
Brightness
2. Position neck assy as shown in Figure 3-1.
3. Set the pattern generator raster signal to green.
4. Move the deflection yoke to the rear and adjust with the purity
control so that the green is at the center and the blue and the red
take up equally sized areas on each side.
(See Figures 3-1 through 3-3.)
5. Move the deflection yoke forward and adjust so that entire
screen is green. (See Figure 3-1.)
6. Switch the raster signal to blue, then to red and verify the
condition.
7. When the position of the deflection yoke has been decided,
fasten the deflection yoke with the screws.
8. If the beam does not land correctly in all the corners, use a
magnet to adjust it. (See Figure 3-4.)
Purity control
corrects this area.
corrects this area.
Disk magnets or rotatable
disk magnets correct these
areas (a-d).
disk magnets correct these
areas (a-d).
Deflection yoke positioning
corrects these areas.
corrects these areas.
a
b
b
c
c
d
d
a
Neck assy
G2
G1
G3
Behind the G1 edge
Fig. 3-1
Purity control
Red
Blue
Green
– 16 –
KV-J25MN1AK
RM-883
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 are on top of each other at the center of the
screen.
2. (Moving horizontally), adjust the H.STAT VR so that the red,
green and blue dots are on top of each other at the center of the
screen.
•
Operation of 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
Center dot
R G B
R
G
B
V. STAT
Magnet
RV701
SCREEN (G2)
SCREEN (G2)
C Board
•
Operation of BMC (Hexapole) magnet.
If the red, green and blur dots are not balanced or aligned, then
use the BMC magnet to adjust in the manner discribed below.
R G
B
R
G
B
R
G B
R
G
B
R
G
B
R
G
B
V.STAT
BMC (Hexapole)
Purity
Click on the first or last page to see other KV-J25MN1AK service manuals if exist.