DOWNLOAD Sony KV-J25MF8J Service Manual ↓ Size: 5.32 MB | Pages: 52 in PDF or view online for FREE

Model
KV-J25MF8J
Pages
52
Size
5.32 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-j25mf8j.pdf
Date

Sony KV-J25MF8J Service Manual ▷ View online

– 13 –
2-7.  F1 AND H3 BOARDS REMOVAL
2-8.  PICTURE TUBE REOVAL
1
 
Two screws
     (+BVTP4 x16)
1
 
Two screws
    (+BVTP4 x16)
$
 
Two screws
(Tapping 7+Crown
  Washer)
$
 
Two screws
(Tapping 7+Crown
  Washer)
@ DGC
! DGC clip
[KV-J29MF8J]
9 Two DGC band
6 C2 Board
0 Two DGC holder
[KV-J29MF8J]
0 Two DGC holder
! DGC clip
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
     [KV-J29MF8J]
    
     [KV-J29MF8J ]
    
   [KV-J25MF8J]
1 Two connector
5 connector
6 connector
4 Two Flat
cables
2 Two
claws
8 H3 Board
7 Two claws
3 F1 Board
– 14 –
• REMOVAL OF ANODE-CAP
NOTE :
Short circuit the anode of the picture tube and the anode cap
to the metal chassis, CRT shield or carbon paint on the CRT,
after removing the anode.
• REMOVING PROCEDURES
a
1
Turn up one side of the rubber cap in the direction
indicated by the arrow 
a
.
b
b
2
Using a thumb pull up the rubber cap firmly in the direction
indicated by the arrow 
b
.
Anode button
c
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 up it in the direction of the
arrow 
c
.
• HOW TO HANDLE AN ANODE-CAP
1
Don't hurt the surface of anode-caps with sharp shaped
material!
2
Don't press the rubber hardly not to hurt inside of anode-
caps!  A material fitting called as shatter-hook terminal
is built in the rubber.
3
Don't turn the foot of rubber over hardly! The shatter-
hook terminal will stick out or hurt the rubber.
– 15 –
SECTION 3
SET-UP ADJUSTMENTS
.................................................................................................................................................................................................................................
}
normal
Fig. 3-1
G2
G1
G3
Behind the G1 edge
Neck assy
Fig. 3-2
Green
Red
Blue
Fig. 3-3
Disk magnets or rotatable
disk magnets correct these
areas (a-b).
a
b
c
d
c
b
a
d
Deflection yoke positioning
corrects these areas.
Fig. 3-4
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 ..........................................................  RESET
BRIGHTNESS control ...............................................  CENTER
Preparations :
In order to reduce the influence of geomagnetism on the set's
picture tube, face it east or west.
Switch on the set's power and degauss with the degausser.
3-1. BEAM LANDING
1. Input a white signal with the pattern generator.
Contrast
Brightness
2. Position neck ass'y as shown in Fig3-2.
3. Set the pattern generator raster signal to a red raster.
4. Move the deflection yoke to the rear and adjust with the  purity
control so that the red is at the center and the blue and the green
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 the entire
screen is red. (See Figure 3-1.)
6. Switch the raster signal to blue, then to green and verify the
condition.
7. When the position of the deflection yoke has been decided,
fasten the deflection yoke with the screws and DY spacers.
8. If the beam does not land correctly in all the corners, use a
magnet to adjust it.
(See Figure 3-4.)
Perform the adjustments in order as follows :
1. Beam Landing
2. Convergence
3. Focus
4. White Balance
Note :  Test Equipment Required.
1. Color-bar/Pattern Generator
2. Degausser
3. Oscilloscope
Purity control
corrects this area.
– 16 –
3-2. CONVERGENCE
Preparations :
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 horizontally), adjust the H.STAT control so that the
red, green and blue points are on top of each other at the center
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 center of
the screen.
3. If the H.STAT variable resistor cannot bring the red, green and
blue points together at the center of the screen, adjust the hori-
zontal 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.)
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
H. STAT
V. STAT
Magnet
Center dot
R   G   B
R
G
B
RV702
H. STAT
RV701
SCREEN (G2)
C Board
Tilt the V.STAT magnet and adjust the static convergence by
opening or closing 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 points move as shown
below.
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