PURITY ADJUSTMENT
Note: During the adjustment, keep the unit facing the east.
PURITY ADJUSTMENT
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The beam landing is shifted outwards.
Figure
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The beam landing is shifted to right.
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Figure
6.
The beam landing is shifted to left.
Right
1.
Prior to the purity adjustment, warm up the
unit with beam current of more than
700
PA,
for
rnore
than
30
minutes.
2.
Receive the green signal alone and adjust the
beam current to
approx.
770
PA.
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 at the position which
gives zero
(0)
magnetic field.
Adjustment
6.
Observe the green spots (“a” and
“b”)
with a
microscope as shown Fig. A, and adjust the
purity magnet so that they are at the
specified landing position.
7.
If the right and left green spots are both
deviated outwards from their landing
positions as shown in Fig. B,’ push the
deflection yoke forwards until their positions
are corrected.
8.
If the beam landing is shifted to
*right
or left
as shown in Figs.
Cand
D,
adjust the opening
degree of the purity magnet so that the beam
landing is correctly positioned.
9.
Adjust the purity magnet so that the beam
landing is correct at either of the central 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.
IO. If the green beam is positioned to mix with
the other
colour,
pull the deflection yoke
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.
Il.
Set the raster rotation at
“0”
position (with
the unit facing the east).
12.
Tighten the screws of the deflection coil.
Tightening torque:
11
kg
+
2 kg.
Figure
D.
12
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