Beam Landing And Raster Center Adjustments; Beam Landing Adjustment - Sony TRINITRON KD-34XBR2 Service Manual

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.
Disk magnets
or rotatable disk
magnets correct
these areas (a-d)
b
d
This completes the beam landing adjustment.
— 13 —
Purity control
corrects this area
Deflection yoke positioning
corrects these areas
a
c
KD-34XBR2