Set-Up Adjustments; Beam Landing Adjustment - Sony TRINITRON KV-SZ252M50 Service Manual

KV-SZ252M50/M61/M81/N50/N60
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"
......................................................................................................................................................................................................................
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.

3-1. 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:-
Purity control
3. Position Neck Assy as shown below:-
G1
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.
RM-GA002

SET-UP ADJUSTMENTS

Neck assy
Align the edge of
the neck assy with
the edge of the G2 grid.
G2 G3
Blue
Red
Green
SECTION 3
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
2. Degausser
3. DC Power Supply
4. Digital Multimeter
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.
Purity control
corrects this area.
b
c
Deflection yoke positioning
corrects these areas.
a
d
– 14 –
5. Oscilloscope
6. Landing Checker
7. XCV Adjuster
Disc magnets or rotatable
disc magnets correct these
areas (a-d).
a
d
b
c