Toshiba 13A20 Manuale di servizio - Pagina 10

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CONVERGENCE ADJUSTMENTS

NOTE: Before attempting any convergence adjustments,

the receiver should be operated for at least fifteen

minutes.

CENTER CONVERGENCE ADJUSTMENT

1. Display built-in cross-dot pattern using the TEST SIG-

NAL SELECTION function.

2. Adjust the BRIGHTNESS and CONTRAST Controls

for well defined pattern.

3. Loosen the tightening ring and adjust two tabs of the

4-Pole Magnets to change the angle between them

(See figure 4.) and superimpose red and blue vertical

lines in the center area of the picture screen.

(See figure 3.)

4. Turn the both tabs at the same time keeping the con-

stant angle to superimpose red and blue horizontal

lines at the centre of the screen. (See figure 3.)

5. Adjust two tabs of 6-Pole Magnets to superimpose red/

blue line with green one. Adjusting the angle affects

the vertical lines and rotating both magnets affects the

horizontal lines.

6. Repeat adjustments 3, 4, 5 keeping in mind red, green

and blue movement, because 4-Pole Magnets and 6-

Pole magnets interact and make dot movement com-

plex.

7. After completing the "CENTER CONVERGENCE AD-

JUSTMENT" tighten the tightening ring to fix the mag-

nets.

BLU RED

BLU

RED

4-POLE MAGNETS

MOVEMENT

Center Convergence by Convergence Magnets

Figure 3.

Xv COIL ADJUSTMENT

Adjust the Xv coil (on the deflection yoke) to correct

misconvergence at both sides on screen.

Use a hexagonal tip stick (plastic) to adjust the core of

coil.

Clockwise Adjustment Counterclockwise Adjustment

X v Cross Pattern View

RED/BLUE GRN

RED/BLUE

GRN

6-POLE MAGNETS

MOVEMENT

6-POLE

MAGNETS

PURITY

MAGNETS

ADJUST THE ANGLE

(VERTICAL LINES)

ADJUSTMENT OF MAGNETS

SCREEN-CORNER CONVERGENCE

When the misconvergence is still evident on corners even

though the above adjustment is done, use the ferrite sheet

(Part No. 23993622) to correct misconvergence.

1. Put ferrite sheets into the space under the yoke.

Decide such position that misconvergence becomes

minimum, watching picture screen. (See figure below.)

2. Remove cover paper of ferrite sheet to stick it in the

place on the tube. Put adhesive tapes on ferrite sheets

to fix.

Ferrite

Sheets

For correcting misconvergence

on the position A

– 7 –

4-POLE

MAGNETS

PURITY/CONVERGENCE

MAGNETS

FIXED

ROTATE TWO TABS

AT THE SAME TIME

(HORIZONTAL LINES)

Figure 4.

Ferrite

Sheets