Set-Up Adjustments; Beam Landing; Convergence - Sony TRINITRON KV-27TW77 Service Manual

SECTION 3
KV-27TW77/27TW78
KV-32TW77/32T
SET-UP ADJUSTMENTS
Perform the adjustments im order as follows :
@ 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.
Controls and switch should be set as follows unless
otherwise noted :
PICTURE control. ........... RESET
BRIGHTNESS control .......... center
Preparations :
@ In order to reduce the influence of geomagnetism
on the set's picture tube face it east or west.
@ Switch on the set's power and degauss with the
degausser.
3-1. BEAM LANDING
1. Input the white signal with the pattern generator.
Contrast
Bightness normal
2. Set the pattern generator raster signal to green.
3. Move the deflection yoke to the rear and adjust
with the purity control so that the green is at the
center and the blue and the red take up equally
sized areas on each side.
(See Figures 3-1 through 3-3.)
4. Move the deflection yoke forward and adjust so
that entire screen is green. (See Figure 3-1.)
5. Switch the raster signal to blue, then to red and
verify the condition.
6. When the position of the deflection yoke has been
decided, fasten the deflection yoke with the screws.
7. If the beam does not land correctly in all the
corners, use a magnet to adjust it.
(See Figure 3-4.)
1.
2
3.
4
Beam Landing
Convergence
Focus
White Balance
Note: Test Equipment Required.
1. Color-bar/Pattern Generator
2. Degausser
3. Oscilloscope
Fig.3-2
Purity control
Deflection yoke
Disk magnets or
rotatable disk
magnets correct
these areas(a-d).
W78
M-Y118