Set-Up Adjustments; Beam Landing - Sony TRINITRON PVM-8041Q Service Manual

PVM-8041Q/8044Q
SECTION 3
SET-UP ADJUSTMENTS
• The following adjustments should be made when a complete
realignment is required or a new picture tube is installed.
• These adjustments should be performed with rated power supply
voltage unless otherwise noted.
The control and switch below should be set as follows unless otherwise
noted:
CONTRAST control.80%
BRIGHTNESS control.50%
3-1. BEAM LANDING
Precaution
1. Set the side of the unit with the PICTURE TUBE so that it faces
east or west in order to reduce the influence of external magnetic
force.
2. Turn the power switch for the unit ON and erase the magnetic force
using a degausser.
(1) Beam Landing
1. Receive an entirely white signal with the pattern generator.
CONTRAST.MAX.
BRIGHTNESS.set easy to observe
2. Adjust the white balance, G2 voltage and convergence roughly.
3. Loosen the deflection yoke mounting screw, and set the purity
control to the center as shown in Fig.3-1.
4. Switch over the pattern generator to green.
5. Move the deflection yoke backward, and adjust with the purity
control so that green is in the center and blue and red are at the
sides, evenly. (Fig.3-2)
6. Move the deflection yoke forward, and adjust so that the entire
screen becomes green. Repeat 5 to 7 as to red and blue.
7. When landing at the corners is not right, correct by using the
magnet. (Fig.3-3)
8. When the position of the deflection yoke is determined, tighten it
with a deflection yoke mounting screw.
CAUTION: When correction magnet is used, be sure to
degauss the unit.
Perform the adjustments in order as follows:
3-1. Beam Landing
3-2. Convergence
3-3. Focus
3-4. White Balance
Note: Test equipment Required.
1. Color Bar/Pattern Generator
2. Degausser
3. Color Analyzer (Minolta)
4. Luminance Level Meter
Fig.3-2 Fig.3-2
Purity control corrects
Disk magnets or
rotatable disk
magnets correct
these area (a-d).
Deflection yoke positioning
corrects these areas.
Flg.3-3