KD-34XBR2 - Sony TV Service Manual (repair manual). Page 12

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KD-34XBR2
SECTION 3:  BEAM LANDING AND RASTER CENTER ADJUSTMENTS
3-1.  BEAM LANDING ADJUSTMENT
REQUIRED EQUIPMENT:
 
NTSC Video Pattern Generator (into VIDEO-1 input)
 
Landing Magnets (for correcting mislanding in the corners of the set)
SET-UP CONDITION:
 DISPLAY 
MODE: 
FULL
 VIDEO 
SOURCE: 
VIDEO-1
 
PICTURE MODE: STANDARD  (select the STANDARD mode from 
the menu, then press the RESET button on the remote control to set 
the STANDARD settings to the factory settings.)
 
TILT CORRECTION: Set to 0 (Zero)
 
VERTICAL CORRECTION: Set to 0 (Zero)
 
PICTURE TUBE POSITION: Face in an East or West Direction**
 
**Note: Typically, adjustments will be made to this unit while it 
is in its normal position in a customer’s home.  Any 
directional references made in this manual should only 
be followed when the unit is being serviced elsewhere 
(e.g. in a shop).
PROCEDURE:
1.  Turn on power to the set and make sure that the degauss circuit is in 
working order (a brief hum will sound from the degauss coils).
2.  Loosen the defl ection yoke mounting screw, and set  the purity 
magnet adjustment tabs to the center as shown below:
Purity Magnet Adjustment Tabs
3.  Input a green raster from the pattern generator.
4.  Move the defl ection yoke backwards, and adjust the purity ring 
magnets so that the center of the screen is green, and the red and 
blue areas on either side of the screen are approximately the same 
size as shown in the fi gure below: 
Blue
Red
Green
5.  Move the defl ection yoke forward until the entire screen becomes 
green. 
6.  Confi rm the purity for both the red and blue rasters.
7.  Tighten the defl ection yoke mounting screw just enough to keep the 
yoke from moving forward or backward, but not too tight as to keep 
it from rotating.
8.  Input a crosshatch pattern from the generator.  Rotate the yoke so 
that the crosshatch’s top and bottom lines are as even with the 
bezel as possible.  Secure the defl ection yoke by fully tightening the 
mounting screw.
9.  Use a DY Spacer (p/n: 4-053-005-01) between the defl ection yoke 
and the CRT in order to maintain the yoke position in each axis.
10. Add disk magnets (p/n: 1-452-032-00) to the back of the CRT as 
necessary to correct mislanding in the corners of the screen.
b
d
a
c
Purity control
corrects this area
Deflection yoke positioning
corrects these areas
Disk magnets
or rotatable disk
magnets correct
these areas (a-d)
This completes the beam landing adjustment.
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