Hitachi 36UX59B Service Manual page 44

b
Vertical
0 a'
a-a', b-b
Show the geometric
center line of CPT
Screen
b'
C-F MAG P#2773672
The openings of the purity magnet should be sym-
metric: on the right and left sides (P#2773671)
on the upper and lower sides (P#2773672)
FIGURE l-3-2
(7)
Receive the single red signal. When the single
red signal is not available, short circuit between
the base and emitter of Q845, and between the
base and emitter of Q857 and set to single red.
(8)
Pull back DY gradually and when the color
unevenness of both sides of the picture disap-
pear, mark the rear edge position of DY on the
tape wound around CPT neck as shown in
Figure l-3-3. Pull back DY further and just
before the color unevenness of both sides of the
picture disappear, mark the rear edge position of
DY on the tape in the same way. At this time,
pull back DY so that the center axis of DY and
CPT axis match.
MARK I NC
FIGURE l-3-5
SCOTCH TAPE
Miss landing criteria
The following conditions are defined as miss
landing. Each color beams shines on the phos-
phor of the applied color and there are phosphor
parts which are not luminous (shaded parts in
(9) Move DY so that the rear edge position of DY
comes to the center of the two marked lines and
fasten DY as d=d' (Figure l-3-4). Further insert
the rubber wedge between DY and CPT funnel
from the top and raise DY backwards.
FIGURE l-3-4
b
a - a'
b - b'
Geometric center
line of CPT
a
-
(10) Set CPT axis direction magnetic field of the artifi-
cial magnetic field according to the artificial mag-
netic field setting list classified by destination.
(The direction of the magnetic field should be
from the CPT screen side to the neck side.)
(11) After degaussing it from outside, check the purity
in each color to R, G and B visually. Then, turn
the screen to white and check the landing at the
screen position shown in Fig. l-3-5 with a micro-
scope.
Criteria with microscope
There should be no miss landing at positions 2,
4, 8 and 10. Green beam should be at center of
the green phosphor at position C. (Refer to the
miss landing criteria.)
(12) Turn over the direction of CP?axis direction
magnetic field of the next artificial magnetic field
and check it by the same way as item (11). The
positions of miss landing criteria with a micro-
scope should be 2, 4, 8 and 10 (Figure l-3-5).
FIGURE l-3-3
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