Sony KV-T25SZ8 Service Manual ▷ View online
– 9 –
KV
-T25SZ8
-T25SZ8
RM-870
2-1. REAR COVER REMOVAL
2-3. F1 BOARD REMOVAL
SECTION 2
DISASSEMBLY
2-2. A BOARD REMOVAL
2-4. SERVICE POSITION
2 Two screws
(BVTP 4
×
16)
3 One screw
(BVTP 3
×
16)
1 Two screws
(BVTP 4
×
16)
Lever
Lever
A board
F1 board
A board
– 10 –
KV
-T25SZ8
-T25SZ8
RM-870
2-5. REPLACEMENT OF PARTS
For replacement of the Multi Button, Power Button and Light Guide, cut the welded portions
from them, exchange with the new parts, and fix them with screws (+BVTP) respectively.
2-5-1. REPLACEMENT OF MULTI BUTTON
2-5-2. REPLACEMENT OF POWER BUTTON AND LIGHT GUIDE
2-6. DEMAGNETIZATION COIL REMOVAL
Two screws
(BVTP 3
(BVTP 3
×
12)
Two screws
(BVTP 3
(BVTP 3
×
12)
Cut
Light guide
Power button
3 Demagnetization coil
4 Tension spring
Picture tube
2 DGC holder
1 DGC band
Remove the claw
– 11 –
KV
-T25SZ8
-T25SZ8
RM-870
2-7. PICTURE TUBE REMOVAL
2
Using a thumb press down then pull up the rubber cap firmly in the direction
indicated by the arrow
indicated by the arrow
b
.
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
anode-cap can be removed by turning up the rubber cap and pulling it up in the
direction of the arrow
c
.
•
HOW TO HANDLE AN ANODE-CAP
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-caps.
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.
•
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.
•
REMOVING PROCEDURES
1
Turn up one side of the rubber cap in the direction indicated by the arrow
a
.
2 A board
5 Deflection yoke
Cushion
6 Four screws
(Tapping screws)
1 Anode cap
4 C board
3 F1 board
7 VM board
a
a
b
b
c
Anode button
– 12 –
KV-T25SZ8
RM-870
•
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
GREEN
BLUE RED
Fig. 3-2
}
normal
Purity control
Deflection yoke positioning
corrects these areas.
Purity control corrects
this area.
Disk magnets or rotatable
disk magnets correct
these areas (a-d).
disk magnets correct
these areas (a-d).
a
c
b
d
a
b
c
d
Fig. 3-1
Neck assy
G1 G2 G3
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 a green raster.
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 the 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 screw.
8. If the beam does not land correctly in all the corners, use a
magnet to adjust it.
(See Figure 3-4.)
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