Sony KV-21M5D Service Manual ▷ View online
13
Anode button
a
* REMOVING PROCEDURES.
Turn up one side of the rubber cap in
the direction indicated by the arrow a
the direction indicated by the arrow a
1
2 Using a thumb pull up the rubber cap
firmly in the direction indicated by the
arrow b
firmly in the direction 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 c
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
b
b
c
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.
• REMOVAL OF ANODE-CAP
•
HOW TO HANDLE THE ANODE-CAP
1
To prevent damaging the surface of the anode-cap do not use sharp materials.
2
Do not apply too great a pressure on the rubber, as this may cause damage to the
anode connector.
anode connector.
3
A metal fitting called a shatter hook terminal is fitted inside the rubber cap.
Do not turn the rubber foot over excessively this may cause damage if the shatter
hook sticks out.
Do not turn the rubber foot over excessively this may cause damage if the shatter
hook sticks out.
Cushion
2-4. PICTURE TUBE REMOVAL
4 Deflection yoke
5 DGC holder
Picture tube 9
C board 3
Anode cap 1
2 A Board
Spring tension 7
Degaussing coils 6
Four PT screws 8
14
•
When complete readjustment is necessary or a new
picture tube is installed, carry out the following
adjustments.
picture tube is installed, carry out the following
adjustments.
•
Unless there are specific instructions to the contrary,
carry out these adjustments with the rated power supply.
carry out these adjustments with the rated power supply.
•
Unless there are specific instructions to the contrary, set the
controls and switches to the following settings :
controls and switches to the following settings :
Contrast
...............
80% [or remote control normal]
Brightness
...............
50%
Carry out the following adjustments in this order :
3-1.
Beam Landing
3-2.
Convergence
3-3.
White balance
3-4.
Focus
Note :
Test equipment required
1.
1.
Color bar/pattern generator.
2.
Degausser.
3.
Oscilloscope.
4.
Digital multimeter.
5.
DC Power supply.
SECTION 3
SET-UP ADJUSTMENTS
GREEN
BLUE
RED
a
b
c
d
a
c
b
d
Purity control corrects
this area.
this area.
Deflection yolk positioning
corrects these areas.
corrects these areas.
Disk magnets or
rotatable disk
magnets correct
these areas (a - d).
rotatable disk
magnets correct
these areas (a - d).
Purity Control
Deflection Yoke
G1
Neck Assy
A buckle
G2
For 29" models align the neck assy
as indicated below.
as indicated below.
Preparation:
1.
In order to reduce the influence of geomagnetism on the set’s
picture tube, face it in an easterly or westerly direction.
picture tube, face it in an easterly or westerly direction.
2.
Switch on the TV set’s power and degauss with the
degausser.
degausser.
3-1. BEAM LANDING
1.
Input an all-white signal from the pattern generator.
Set the Contrast and Brightness to normal.
Set the Contrast and Brightness to normal.
2.
Set the pattern generator raster signal to all Red.
3.
Move the deflection yolk forward and adjust with the purity
control so that the Red is at the centre and the Blue and Green
take up equally sized areas on each side of the screen.
[See Fig.3-1 - 3-3].
control so that the Red is at the centre and the Blue and Green
take up equally sized areas on each side of the screen.
[See Fig.3-1 - 3-3].
4.
Move the deflection yolk forward and adjust so that the entire
screen becomes Red. [See Fig.3-1].
screen becomes Red. [See Fig.3-1].
5.
Switch the raster signal to Blue, then to Green and verify the
purity condition.
purity condition.
6.
When the position of the deflection yolk has been determined,
fasten the deflection yolk with the screws.
fasten the deflection yolk with the screws.
7.
If the beam does not land correctly in all the corners, use
magnets to correct it. [See Fig.3-4].
magnets to correct it. [See Fig.3-4].
Fig. 3-1
Fig. 3-2
Fig. 3-3
Fig. 3-4
15
Centre dot
R
G
B
H.STAT
V.STAT Magnet
R
G
B
RV702
RV701
C Board
SCREEN
3-2. CONVERGENCE
Preparation:
•
Before starting this adjustment, adjust the focus, horizontal
size and vertical size.
size and vertical size.
•
Minimize the Brightness setting.
•
Input a dot pattern from the pattern generator.
(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
centre of the screen.
Red, Green and Blue points are on top of each other at the
centre 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
centre of the screen.
Red, Green and Blue points are on top of each other at the
centre of the screen.
3.
If the H.STAT variable resistor is unable to bring the Red,
Green and Blue points together at the centre of the screen,
adjust the horizontal convergence with the H.STAT variable
resistor and the V.STAT magnet in the manner indicated below.
[In this case, the H.STAT variable resistor and the V.STAT
magnet influence each other].
Green and Blue points together at the centre of the screen,
adjust the horizontal convergence with the H.STAT variable
resistor and the V.STAT magnet in the manner indicated below.
[In this case, the H.STAT variable resistor and the V.STAT
magnet influence each other].
•
Tilt the V.STAT magnet and adjust the static convergence
by opening or closing the V.STAT magnet.
by opening or closing the V.STAT magnet.
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
indicated below.
and b arrows, the Red, Green and Blue points move as
indicated below.
16
BMC (Hexapole)
V.STAT
Purity
R G
B
R
G
B
R
G
B
R
G
B
R
G
B
R
G
B
G
B
R
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
(2)
Operation of the BMC (Hexapole) magnet.
•
The respective dot position resulting from moving each
magnet interact, so be sure to perform adjustment whilst
tracking.
Use the H.STAT VR to adjust the Red, Green and Blue dots
so that they coincide at the centre of the screen
[by moving the dots in the horizontal direction].
magnet interact, so be sure to perform adjustment whilst
tracking.
Use the H.STAT VR to adjust the Red, Green and Blue dots
so that they coincide at the centre of the screen
[by moving the dots in the horizontal direction].
(3)
Dynamic convergence adjustment.
Preparation:
•
Before starting this adjustment, adjust the horizontal and
vertical static convergence.
vertical static convergence.
1.
Slightly loosen the deflection yolk screws.
2.
Remove the deflection yolk spacer.
3.
Move the deflection yolk as indicated in the figure below and
optimize the convergence.
optimize the convergence.
4.
Tighten the deflection yolk screws.
5.
Re-install the deflection yolk spacer.
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