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

– 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
– 11 –
KV-SW252M50/M80
   RM-GA002
Cathode setting voltage:
170 V 
± 2 (VDC)
2-3. FOCUS ADJUSTMENT
FOCUS adjustment should be completed before W/B
adjustment.
1. Receive digital monoscope pattern.
2. Set Picture Mode to "DYNAMIC".
3. Adjust focus VR to obtain a just focus at the
center of the screen.
4. Change the receiving signal to white pattern
and blue back.
5. Confirm magenta ring is not noticeable. In case
magenta ring is obvious, then adjust FOCUS VR
to balance magenta ring and FOCUS.
2-4. G2 (SCREEN) ADJUSTMENTS
1. Set the  following condition:
- Picture and Brightness to "STANDARD".
- TV to Video mode.
- WHBL 16 "RGBB" to 01.
2. Connect R,G,B of the  C board cathode to
oscilloscope.
3. Adjust Brightness to obtain the cathode value
to the value stated below.
4. Adjust SCREEN VR on the FBT until the scanning line
disappears.
5. Finally set WHBL 16 "RGBB" back to 00.
FLYBACK TRANSFORMER  (T503)
Focus
Screen
2-5. WHITE BALANCE ADJUSTMENT
1. Set to Service Mode.
2. Input white raster signal using signal generator.
3. Set the following condition:
Picture "DYNAMIC", PICT 006 "WTS" to 00.
4. At Highlight condition, select WHBL 003 "GDRV"
and 004 "BDRV" with 1 and 4 button of the
remote commander then adjust the data with
3 and 6 button.
5. At Cutoff, select WHBL 000 "BKOR" and 001 "BKOG"
and adjust the data.
6. Perform adjustment at Hightlight and Cutoff condition
until it reaches its target.
7. Write data into memory by pressing [MUTING]
➔-.
8. Finally set PICT 006 "WTS" back to its original data.
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