9
21C-FX1(C)/(G)
21C-FX5/FX8
9-1
9-2
PURITY ADJUSTMENT
No. Adjusting point
Adjusting procedure/conditions
Waveform and others
PURITY ADJ.
1. Receive the GREEN-ONLY signal. Adjust the
beam current to ~700
µ
A.
2. Degauss the CRT enough with the degausing coil.
Note: Follow the Job Instruction Sheet to ad-
just the magnetic field.
Vertical Bv:
+0.030 mT (0.30 gauss)
Horizontal Bh: +0.020 mT (0.20 gauss)
(Reference: page E-13)
3. Maintain the purity magnet at the zero magnetic
field and keep the static convergence roughly
adjusted.
4. Observe the points a, b as shown in Fig. 4-1
through the microscope. Adjust the landing to the
A rank requirements.
5. Orient the raster rotation to 0 eastward.
6. Tighten up the deflection coil screws.
»
Tightening torque: 108
±
20 N (11
±
2 kgf)
7. Make sure the CRT corners landing meet the A
rank requirements. If not, stick the magnet sheet
to correct it.
Note: This adjustment must be done after
warming up the unit for 30 minutes or
longer with a beam current over 700
µ
A.
Note: Set the service mode by TP1001 &
TP1002 (short) then press factory proc-
ess R/C RGB key to change to RGB
mono colour mode.
* For the following colours press R/C RGB key to
change.
1
a
b
A
B
A
30mm
30mm
B
A = B
A = B
Rank "A"
(on the right of the CRT)
Rank "A"
(on the left of the CRT)
Fig. 4-1
Fig. 4-2
Fig. 4-3
* Press R/C RGB key for 1 sec-
ond in NORMAL MODE, the
colour will change to RGB
mono colour mode.
Text Key “ R.G.Cy “ Key can be
directly use to change to other
colours screen.
Signal-colour
screen cleared
GREEN
ONLY
BLUE
ONLY
RED
ONLY
CONVERGENCE ADJUSTMENT
No. Adjusting point
Adjusting procedure/conditions
Waveform and others
CONVERGENC
ADJ.
( To be done
after the purity
adjustment.
1. Receive the "Crosshatch Pattern" signal.
2. Using the remote controller, call NORMAL mode.
Static convergence
1. Turn the 4-pole magnet to a proper opening an-
gle in order to superpose the blue and red col-
ours.
2. Turn the 6-pole magnet to a proper opening an-
gle in order to superpose the green colour over
the blue and red colours.
Dynamic convergence
1. Adjust the convergence on the fringes of the
screen in the following steps.
a) Fig. 5-1: Drive the wedge at point "a" and swing
the deflection coil upward.
b) Fig. 5-2: Drive the wedge at points "b" and "c"
and swing the deflection coil downward.
c) Fig. 5-3: Drive the "c" wedge deeper and swing
the deflection coil rightward.
d) Fig. 5-4: Drive the "b" wedge deeper and
swing the deflection coil leftward.
2. Fix all the wedges on the CRT and apply glass
tape over them.
3. Apply lacquer to the deflection yoke lock screw,
magnet unit (purity, 4-pole, 6-pole magnets) and
magnet unit lock screw.
Finally received the Red-only and Blue-only sig-
nals to make sure there is no other colours on the
screen.
1
RGB
BGR
R
G
B
R
G
B
B
G
R
B
G
R
RGB
BGR
Lacquer
Wedge "a"
Wedge
"b"
Wedge
"c"
About
100Deg
About
100Deg
4-pole magnet
6-pole magnet
CRT neck
20mm
Lacquer
Purity magnet
Fig. 5-1
Fig. 5-2
Fig. 5-3
Fig. 5-4
Fig. 5-5
Fig. 5-6
