PURITY ADJUSTMENT
CONVERGENCE ADJUSTMENT
point
procedure/conditions
I
Waveform and others
Purity
adjustment
1. Using the remote controller, make the screen
green-only. Adjust the contrast control to have a beam
current of about 500
(21”).
2.
the cathode ray tube enough with the
coil.
Note: Follow the Job Instruction Sheet to ad-
just the magnetic field.
Vertical
:
(0.30 gauss)
Horizontal
:
(0.20 gauss)
See page 10.
3. Keep the purity magnet in the zero magnetic field
in advance. Roughly adjust the convergence.
4. Observe the points “a” and “b”, as shown in Fig.
5-1, through a microscope. Adjust the landing to
the rank “A” requirements.
5. Adjust the raster rotation to
eastward.
6. Tighten up the deflection
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Tightening torque: 108
N (11
7. While observing the cathode ray tube corners.
apply the magnet sheet to have the landing at
rank “A”.
Note: Before starting this adjustment, warm
up the unit for 30 minutes or longer at
a beam current of over 500
700
(21
Note: Set the service switch
to call the
service mode and press the
our key on the process remote control-
ler to get the green-only screen.
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Each time the
key is pressed, the
screen
changes as follows.
Fig.
Fig. 5-2
Rank “A” (on the
right of the CRT)
Green-only
Blue-only
Red-only
screen
screen
screen
Fig. 5-3
screen cleared
Rank “A” (on the
left of the CRT)
l
Whether in the service mode
not, hold down the
key for 1 second or longer
the service mode is called.
The TEXT key or the
may be used instead to
the
screens.
o.
I
Waveform and others
1. Receive the
(crosshatch pattern) signal.
I
2. Using the remote controller, call the Normal mode.
STATIC CONVERGENCE
1. Turn the
magnet to a proper opening an-
gle in order to superimpose the blue and red
ours.
2. Turn the
magnet to a proper opening an-
gle in order to superimpose the green
over
the blue and red
DYNAMIC CONVERGENCE
1. Adjust the convergence on the fringes of the
screen in the following steps.
a) Fig.
Drive the wedge at point “a” and
swing the deflection coil upward.
b) Fig.
Drive the wedges at points
and
and swing the deflection coil downward.
c) Fig.
Drive the
wedge deeper and
swing the deflection coil rightward.
d) Fig. 6-4: Drive the
wedge deeper and
swing the deflection coil leftward.
2. Fix all the wedges on the cathode ray tube and
apply glass tape over them.
3. Apply lacquer to the deflection yoke lock screw,
magnet unit (purity,
and
magnets),
and magnet unit lock screw.
Finally receive the red-only and blue-only signals
and make sure there is no other
mixed on
the screen.
Fig.
I
:
. . . . . . .
.
. . . . . .
:
. . . . .
B
\
Fig. 6-2
Fig. 6-3
Fig. 6-4
Wedge “a”
Fig. 6-5
Purity magnet
fig. 6-6
7-2
