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Note:
l
During the adjustment, keep the unit facing the
east.
adjustment
Purity
with beam current of more than 500pA, for
more than 30 minutes.
2. Receive the green signal alone and adjust the
beam current to about 500uA.
3. Fully degauss the CRT with the degaussing coil.
4. Before the purity adjustment, It is needed to
roughly adjust the static convergence.
5. Set the purity magnet
zero (0) magnetic field.
Adjustment:
6. Observe the green spots
microscope as shown in Fig. 3-3., and adjust the
purity magnet so that they are at the specified
landing position.
Figure 3-3.
7. If the right and left green spots are both
deviated outwards from their landing positions
as shown in Fig. 3-4 push the deflection yoke
forwards until their positions are corrected.
,
,
,
The beam landing is shifted
outwards.
Figure 3-4.
8. If the beam landing is shifted to right or to left as
shown in Figs. 3-5. and 3-6., adjust the opening
degree of the purity magnet so that the beam
landing is correctly positioned.
PURITY ADJUSTMENT
the unit
up
at
the position which gives
("a"
and " b" ) with a
T h e b e a m landing IS shlhed
to right.
The beam landing IS shifted
to kfl
9. Adjust the purity magnet so that the beam
landing is correct at either of the centeral part,
right and left parts of screen, then check that
the green beams at four corners of screen are
all correctly positioned.
Finally, check that the beam landing at any pat
of screen is satisfactory with the Rank "B"
specifications.
o t h e r colour, p u l l t h e d e f l e c t i o n y o k e
backward.
l
Outside of the specified landing: To front of the
deflection yoke
l
Inside of the specified -landing: To back of the
deflection yoke
" CROSSHATCH PATTERN" signal.
12. Set the raster rotation at " 0" position (with the
unit fasing the east.)
13. Tighten the screws of the deflection coil.
Tightening torque: 11 kg + 2kg
46
Figure 3-5.
F i g u r e 3 - 6 .
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