Sony KV-G14K7 Service Manual ▷ View online
– 13 –
KV
-G14K7/G21KD7
-G14K7/G21KD7
RM-883
2-6. PICTURE TUBE REMOVAL
(1)
For KV-G14K7
(2)
For KV-G21KD7
•
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.
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
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
c
.
2
Using a thumb pull up the rubber
cap firmly in the direction indicated
by the arrow
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
in the direction indicated by the
arrow
a
.
•
REMOVING PROCEDURES
•
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.
anode cap to the metal chassis, CRT
shield or carbon paint on the CRT.
2 A board
3 C board
4 Deflection yoke
Cushion
5 Four screws
(Tapping screws)
(Tapping screws)
1 Anode cap
2 A board
3 C board
4 Deflection yoke
Cushion
5 Four screws
(Tapping screws)
(Tapping screws)
1 Anode cap
a
a
c
Anode button
b
b
– 14 –
KV-G14K7/G21KD7
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
SECTION 3
SET-UP ADJUSTMENTS
Fig. 3-1
.................................................................................................................................................................................................................................
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. 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.
7. 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
Fig. 3-3
Fig. 3-4
}
normal
Fig. 3-2
GREEN
BLUE RED
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
Purity control
– 15 –
KV-G14K7/G21KD7
RM-883
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
R G B
G
R
B
Center dot
V.STAT Magnet
BMC Magnet
1. (Moving horizontally), adjust the H.STAT magnet 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 V.STAT Magnet cannot bring the red, green and blue points
together at the center of the screen, adjust the horizontal
convergence with the BMC Magnet and the V. STAT magnet in
the manner given below.
(In this case, the BMC Magnet and the V. STAT magnet
influence each other.)
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.
•
Operation of V.STAT Magnet.
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
•
Operation of BMC (Hexapole) Magnet.
b
a
b a
b a
a
b
a
b
R G B
R G B
b
a
R G
B
R G B
b
a
R G B
R G B
b
a
G B
R
R G B
– 16 –
KV-G14K7/G21KD7
RM-883
Purity
V.STAT
BMC (Hexapole)
•
The respective dot positions resulting from moving each magnet
interact, so be sure to perform adjustment while tracking.
Use the V. STAT magnet to adjust the red, green, and blue dots
so they coincide at the center of screen (by moving the dots in
the horizontal direction).
(2) Dynamic Convergence Adjustment
Preparations :
•
Before starting this adjustment, adjust the horizontal static
convergence and the vertical static convergence.
1. Slightly loosen the deflection yoke screws.
2. Remove the deflection yoke spacer.
3. Move the deflection yoke as shown in the figure below and
optimize the convergence.
4. Tighten the deflection yoke screws.
5. Install the deflection yoke spacer.
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
R
G
B
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