DOWNLOAD Sony KV-SW252M50 Service Manual ↓ Size: 5.37 MB | Pages: 69 in PDF or view online for FREE

Model
KV-SW252M50
Pages
69
Size
5.37 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kv-sw252m50.pdf
Date

Sony KV-SW252M50 Service Manual ▷ View online

– 7 –
KV-SW252M50/M80
   RM-GA002
• 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
Turn up one side of the rubber cap in the direction
indicated by the arrow a.
Using a thumb pull up the rubber cap firmly in the direc-
tion indicated by the arrow b.
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.
HOW TO HANDLE AN ANODE-CAP
Do not damage the surface of anode-caps with
sharp shaped objects.
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.
Do not turn the foot of rubber over too hard.
The shatter-hook terminal will stick out or damage
the rubber.
1-10. PICTURE TUBE  REMOVAL
Note:
Please make sure the TV set is not in standing position before removing necessary CRT support located on bottom
right and left.
1) Remove the rear cover.
2) Unplug all interconnecting leads from the Deflection yoke, Neck assy, Degaussing Coil and CRT grounding strap.
Remove Chassis Assy.
3) Place the TV set with the CRT face down on a cushion jig.
4
 Anode Cap Removal
6
 Degaussing Coil
0
 Loosen the Neck Assembly 
fixing screw and remove
Neck Assy & VM board
qa
 Loosen the Deflection Yoke
fixing screw and remove
9
 C Board Removal
7
 Spring Tension(2x) 
Removal
5
 Holder, DGC
Removal (2x)
8
 Earth Coating Assy
qs
 Screw Tapping 7+ Crown Washer (4x)
a
a
c
 Anode Button
b
b
– 8 –
KV-SW252M50/M80
   RM-GA002
The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
The controls and switch should be set as follows unless
otherwise noted:
Picture Control....................................."NORMAL"
Brightness Control..............................."NORMAL"
Perform the adjustments in order as follows :
1. Beam Landing
2. Convergence
3. Focus
4. G2(SCREEN)
5. White Balance
Note : Test Equipment Required.
1. Pattern Generator
5. Oscilloscope
2. Degausser
6. Landing Checker
3. DC Power Supply
7. XCV Adjuster
4. Digital Multimeter
SECTION 2
SET-UP ADJUSTMENTS
Preparation :
• Feed in the white pattern signal.
• Before starting, degauss the entire screen with the
degausser.
• In order to reduce the geomagnetism on the set's picture
tube, face it east or west.
2-1. BEAM LANDING ADJUSTMENT
1. Input a raster signal with the pattern generator.
2. Loose the deflection yoke(DY) mounting screw, and set
the purity control to the center as shown below:-
3. Position Neck Assy as shown below:-
4. Set the raster signal of the pattern generator to green.
5. Move the DY backward and adjust the purity control so
that green is in the center and blue and red are at the
sides evenly.
Red
Blue
Green
a
b
b
c
c
d
d
a
Purity control
corrects this area.
Disc magnets or rotatable
disc magnets correct these
areas (a-d).
Deflection yoke positioning
corrects these areas.
Purity control
Neck assy
G2
G1
G3
Align the edge of
the neck assy with
the edge of the G2 grid.
......................................................................................................................................................................................................................
6. Then move the DY forward and adjust so that the entire
screen becomes green.
7. Now switch over raster signal to red then blue and
confirm the condition.
8. When the position of the DY is determined, tighten it with
the DY mounting screw.
9. If the beam does not land correctly in all the corners of
the screen, use magnet disc to correct it.
– 9 –
KV-SW252M50/M80
   RM-GA002
Moved RV750 (H.STAT)
R
R
G
G
B
B
A
A
B
B
B
B
R
G
G
R
B
2-2. CONVERGENCE ADJUSTMENT
Preparation:
• Before starting, perform FOCUS adjustment.
• Picture Mode "SOFT"
• Receive dot/cross hatch pattern.
1. (Moving vertically), adjust the 4 pole magnet to
converge red, green and blue dots in the center of
the screen.
2. Tilt the 4 pole magnet and adjust static convergence
to open or close the 4 pole magnet.
3. When the 4 pole magnet is moved in the direction of
arrow A and B, the red, green and blue dots moves
as shown below:-
a) Vertical Static Convergence
b) Horizontal Static Convergence
If the blue dots does not converge with the red and
green dots, use the 6 pole magnet to adjust in
the manner described below:-
c) Y Separation axis correction magnet adjustment.
1. Receive cross hatch signal.
2. Set Picture to "MINIMUM", Brightness to "STANDARD".
3. Adjust the Y separation axis correction magnet on
the Neck Assembly so that the horizontal lines at
the top and bottom of the screen are straight.
Neck assy
Neck assy
Red
Blue
Red
Blue
VM board
VM board
6 Pole Magnet
4 pole Magnet
DY pocket
Purity
6 Pole
Magnet
4 Pole
Magnet
R G
B
R
G
B
R
G B
R
B
R
G
G
G
B
R
B
4 pole magnet
RV705
H. STAT
RV1800
G2 (SCREEN) 
C Board
Center dot
R     G     B
G
R
B
– 10 –
KV-SW252M50/M80
   RM-GA002
b
a
c
d
a-d : screen-corner
        misconvergence
a1
b1
c1
d1
a1~d1: Piece A(90), Convergence Correct
or
Permaloy Assy Correction
d) Convergence Rough Adjustment
Preparation:
• Before starting this adjustment, adjust the
horizontal and vertical static convergence.
Input cross hatch pattern.
i)
TLH
Adjust the horizontal convergence of red and blue
dots by inserting TLH Correction Plate to the DY
pocket(left or right).
ii)
YCH
Adjust YCH to balance Y axis.
iii) TLV
Adjust the vertical convergence of red and blue dots.
iv) XCV
Adjust XCV to balance X-axis
e) Screen Corner Convergence
Affix a Piece A(90), Convergence Correct/Permaloy Assy
Correction to the misconverged areas.
.
TLV
R B
YCH
R
B
XCV
B
R
TLH
B
R
ON DY :
(VR1)
TLV1 (no need to adjust)
DY pocket
DY pocket
TLH Plate
(VR3)
TLV2
(XCV)
(VR2)
YCH
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