Sony KV-TF21M80 Service Manual ▷ View online
–
21
–
KV
-TF21M80
-TF21M80
RM-952
2-8. PICTURE TUBE REMOVAL
2
A board
4
C3 board
5
Deflection yoke
Cushion
6
Four screws
(Tapping screws)
1
Anode cap
3
F board
•
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
.
a
a
b
b
c
– 22 –
KV-TF21M80
RM-952
•
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 switches 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. 3-3
}
normal
Fig. 3-1
Preparation :
•
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. Set the pattern generator raster signal to a green raster.
3. 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.)
4. Move the deflection yoke forward and adjust so that the entire
screen is green. (See Figure 3-1.)
5. Switch the raster signal to blue, then to red and verify the
condition.
6. When the position of the deflection yoke has been decided,
fasten the deflection yoke with the screws and DY spacers.
7. If the beam does not land correctly in all the corners, use a
magnet to adjust it.
(See Figure 3-4.)
Fig. 3-2
Fig. 3-4
Purity control
Red
Blue
Green
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).
b
c
a
d
b
a
c
d
– 23 –
KV-TF21M80
RM-952
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
(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.
4
BMC (Hexapole) Magnet.
If the red, green and blue dots are not balanced or aligned, then
use the BMC magnet to adjust in the manner described below.
1
V. STAT
2
H. STAT VR
3
R G B
G
R
B
Center dot
C3 board
RV 702
V.STAT Magnet
H. STAT VR
BMC (Hexapole)
V.STAT
Purity
V.STAT
BMC
Purity
R
R
R
R
G
G
G
G
B
B
B
B
a
a
a
b
b
b
b
R
R
G
G
B
B
a
a
b
b
b
R G
B
R
G
B
R
G B
R
B
R
G
G
G
B
R
B
– 24 –
KV-TF21M80
RM-952
(3) Screen-corner Convergence
(2) Dynamic Convergence Adjustment
Preparation:
•
Before starting this adjustment, adjust the horizontal static
convergence and the vertical static convergence
on DY
R B
TLV
YCH
B
R
YCH
TLV
a
d
c
b
a to d : Permalloy assembly
Fix a Permalloy assy
corresponding to the
misconverged areas
corresponding to the
misconverged areas
b
a
c
d
a-d : screen-corner
misconvergence
misconvergence
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