Sharp 21C-FX1G Manuel d'entretien - Page 9

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1. Specifications

PURITY ADJUSTMENT

No. Adjusting point

Adjusting procedure/conditions

PURITY ADJ.

1. Receive the GREEN-ONLY signal. Adjust the

beam current to ~700 µA.

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

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.

GREEN

ONLY

Signal-colour

screen cleared

Waveform and others

Fig. 4-1

30mm

Fig. 4-2

Rank "A"

(on the right of the CRT)

BLUE

RED

ONLY

Fig. 4-3

Rank "A"

(on the left of the CRT)

* 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.

9-1

CONVERGENCE ADJUSTMENT

No. Adjusting point

Adjusting procedure/conditions

CONVERGENC

1. Receive the "Crosshatch Pattern" signal.

ADJ.

2. Using the remote controller, call NORMAL mode.

( To be done

after the purity

Static convergence

adjustment.

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

30mm

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

A = B

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.

A = B

Waveform and others

BGR

Fig. 5-1

RGB

Fig. 5-2

RGB

Fig. 5-3

BGR

Fig. 5-4

Wedge "a"

About

100Deg

Lacquer

Wedge

"b"

Fig. 5-5

4-pole magnet

6-pole magnet

Lacquer

Purity magnet

Fig. 5-6

9-2

About

100Deg

Wedge

"c"

CRT neck

20mm