Sony KV-29FX60A Service Manual ▷ View online
21
•
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
...............
normal
Brightness
...............
normal
Carry out the following adjustments in this order:
3-1.
Beam Landing
3-2.
Convergence
3-3.
Focus
3-4.
White balance
Note:
Test equipment required
1.
1.
Color bar/pattern generator.
2.
Degausser.
3.
Digital multimeter.
4.
Oscilloscope.
SECTION 3
SET-UP ADJUSTMENTS
3-1. BEAM LANDING
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 set’s power and degauss with the
degausser.
degausser.
(1)
Adjustment of Correction Magnet for Y-Splitting
Axis
Axis
1.
Input a crosshatch signal from the pattern generator.
2.
Set the Picture control to minimum and confirm that the
Brightness control is set to normal.
Brightness control is set to normal.
3.
Position the neck assembly as indicated in Fig.3-2.
4.
Move the deflection yolk as far forward as is possible.
5.
Adjust the upper and lower pin symmetrically by opening or
closing the Y-splitting axis correction magnets located on the
neck assembly.
closing the Y-splitting axis correction magnets located on the
neck assembly.
6.
Return the deflection yolk to its original position.
Caution :
High voltages are present on the Deflection yolk terminals - take care
when handling the Deflection yolk whilst carrying out adjustments.
when handling the Deflection yolk whilst carrying out adjustments.
(2) Landing
Note :
Before carrying out the following adjustments
adjust the magnets as indicated below [See Fig.3-3].
adjust the magnets as indicated below [See Fig.3-3].
1.
Input an all-white signal from the pattern generator.
Maximize the picture setting and adjust the Brightness
setting.
Maximize the picture setting and adjust the Brightness
setting.
2.
Rough-adjust the focus and horizontal convergence.
3.
Loosen the deflection yolk screws and align the purity
adjustment knob to its central position. [See Fig.3-1].
adjustment knob to its central position. [See Fig.3-1].
4.
Switch from the all-white pattern to an all-green pattern.
5.
Move the deflection yolk backwards and adjust with the
purity magnet so that the green is at the centre and it aligns
symmetrically. [See Fig.3-4].
purity magnet so that the green is at the centre and it aligns
symmetrically. [See Fig.3-4].
6.
Move the deflection yolk forward and adjust so that the
entire screen becomes green.
entire screen becomes green.
7.
Switch the raster signal to red, then to blue and verify the
landing condition.
landing condition.
8.
When the position of the deflection yolk has been determined,
fasten the deflection yolk with the screw.
fasten the deflection yolk with the screw.
9.
If the beam does not land correctly in all the corners of the
screen, use magnets
to correct it. [See
Fig.3-5].
to correct it. [See
Fig.3-5].
Y-splitting axis correction magnet
Fig.3-1
Fig.3-2
Purity
Fig.3-3
Align Pips
on each
magnet
on each
magnet
Neck assy
Align the bottom edge
of the neck assy with
the G3 hole centre.
of the neck assy with
the G3 hole centre.
Deflection yoke
22
(Open)
(Close)
B
G
R
B
G
R
B
G
R
Fig.3-4
Fig. 3-5
3-2. CONVERGENCE
(1)
Screen centre convergence
[Static convergence]
[Static convergence]
1.
Input a dot signal from the pattern generator.
Normalize the picture setting.
Normalize the picture setting.
2.
[Moving horizontally], adjust the H.STAT control so that the
horizontal red, green and blue dots coincide at the centre of the
screen.
horizontal red, green and blue dots coincide at the centre of the
screen.
3.
[Moving vertically], adjust the V.STAT magnet so that the
vertical red, green and blue dots coincide at the centre of the
screen.
vertical red, green and blue dots coincide at the centre of the
screen.
•
If the horizontal dots are unable to coincide with the variable
range of the H.STAT convergence, adjust together with the
V.STAT convergence while tracking.
[Adjust the convergence by tilting the V.STAT convergence or
by opening and closing the V.STAT convergence.]
range of the H.STAT convergence, adjust together with the
V.STAT convergence while tracking.
[Adjust the convergence by tilting the V.STAT convergence or
by opening and closing the V.STAT convergence.]
4.
Movement of the red, green and blue dots by tilting the
V.STAT magnet and by opening or closing the V.STAT
magnet.
V.STAT magnet and by opening or closing the V.STAT
magnet.
a).
By opening or closing the V.STAT magnet, the red, green and
blue dots move as indicated
below.
blue dots move as indicated
below.
b).
By rotating the V.STAT magnet counter
clockwise, the red,
green and blue
dots move as
indicated
below.
clockwise, the red,
green and blue
dots move as
indicated
below.
Purity control corrects
this area.
this area.
Disk magnets or
rotatable disk
magnets correct
these areas (a-d).
rotatable disk
magnets correct
these areas (a-d).
Deflection yoke positioning
corrects these areas
corrects these areas
H.STAT
convergence
control
V.STAT
vertical static magnet
Center dot
H.STAT VR on
mount side
RV5376
Screen (G2)
Screen (G2)
H.STAT convergence
GREEN
BLUE
RED
23
B
G
R
B
G
R
B
G
R
H M C c o r r e c t i o n ( A )
H M C c o r r e c t i o n ( B )
A < B
A = B
R G
B
R G B
A > B
A = B
R
G B
R G B
C < D
C = D
C > D
C = D
R
G
G
B
C
D
C
D
R
G
B
R
G
B
R
G
B
V M C c o r r e c t i o n ( A )
V M C c o r r e c t i o n ( B )
c).
By rotating the V.STAT magnet clockwise, the red, green and
blue dots move in the direction indicated below.
blue dots move in the direction indicated below.
d).
By opening or closing the V.STAT magnet, the red, green and
blue dots move in the direction indicated below.
blue dots move in the direction indicated below.
Note :
If the blue dot does not coincide with the red and
green points correct the points by using the BMC
[Hexapole] magnet.
green points correct the points by using the BMC
[Hexapole] magnet.
5.
Correction for HMC [horizontal mis-convergence] and
VMC [vertical mis-convergence] by using the BMC
[Hexapole] magnet.
VMC [vertical mis-convergence] by using the BMC
[Hexapole] magnet.
a).
HMC correction by BMC [Hexapole] magnet and movement
of the electron beam.
of the electron beam.
b).
VMC correction by BMC [Hexapole] magnet and movement
of the electron beam.
of the electron beam.
HAMP
7.
HTIL correction can be performed by adding a THL correction
ASSY to the DY.
ASSY to the DY.
HTIL
TLH correction Assy
4-057-714-01
24
FOCUS
Layout of each control
Fig 3-5
Note :
If you are unable to adjust the corner convergence
properly, this can be corrected with the use of
permalloys.
properly, this can be corrected with the use of
permalloys.
3-3. FOCUS
1.
Receive a television broadcast signal.
2.
Normalize the picture setting.
3.
Adjust the focus control located on the flyback transformer to
obtain the best focus at the centre of the screen.
Bring only the centre area of the screen into focus, the
magenta-ring appears on the screen. In this case, adjust the
focus to optimize the screen uniformly.
obtain the best focus at the centre of the screen.
Bring only the centre area of the screen into focus, the
magenta-ring appears on the screen. In this case, adjust the
focus to optimize the screen uniformly.
3-4. SCREEN (G2), WHITE BALANCE
[Adjustment in the service mode using the remote
commander]
commander]
G2 adjustment (RV5376)
1.
Input a dot signal from the pattern generator.
2.
Set the Picture, Brightness and Colour to minimum.
3.
Apply 175V DC from an external power supply to the
R, G and B cathodes of the CRT.
R, G and B cathodes of the CRT.
4.
Whilst watching the picture, adjust the G2 control
RV5376 [SCREEN] located on the C Board to the point
just before the flyback return lines disappear.
RV5376 [SCREEN] located on the C Board to the point
just before the flyback return lines disappear.
Y-splitting axis correction magnet
V STAT convergence magnet
BMC (Hexaploe) magnet
Purity magnet
a-d: screen-corner
convergence defect
convergence defect
a
b
c
d
Convergence adjustment with permalloy
Permalloy Assy
X-4387-214-1
X-4387-214-1
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