Panasonic BT-M2090Y Service Manual page 41

Item
Purity
adjustment
Test equipment Test points
Degaussing coil
Signal
generator( green
raster, red
raster,blue raster ,
cross pattern
signals)
Adjustment
locations
Purity magnets
Convergence
magnets
(Example)
Yv, Ybh, Yht controls
Deflection yoke
Wedges (3)
(Fig.1)
Note: Do not disturb Yv, Ybh and Yht
controls.
-41 -
Dl•M~U~UJ
Adjustment procedure
1. Be sure to degauss using the degaussing coil.
2. Carefully remove the wedges.
3. Peel the adhesive from the 6 magnets to allow
turning the magnets.
4. Supply an green raster signal input.
5. Loosen the deflection yoke securing screw and
slide the yoke fully rearward to produce a red
circle display.
6. Overlap the long with short tabs of the 2 purity
magnets and position these horizontally.
*Set the 2 purity magnets horizontally.
Align horizontally
(Fig.2)
7. Adjust the rotational angle between the tabs to
produce a green circle at the center of the
screen.
Front
Set the green area at the
(Fig.3)
Green
circle
8. Supply a cross pattern input and check for
deviation of the vertical center position.If
deviated, while maintaining the angle between
the tabs, rotate the magnets to center the
vertical position to the extent possible.
Front
Veqi~al centerl,.
positron ___.-,, ·
(slight
indentation)
Set the indentations near the horizontal
line(tolerance about
±
5 mm)
(Fig.4)