Toshiba 19A20 Instrukcja serwisowa - Strona 5

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1. Circuit Block Diagram

CONVERGENCE ADJUSTMENTS

NOTE: Before attempting any convergence adjustments, the

receiver should be operated for at least fifteen min-

utes.

CENTER CONVERGENCE ADJUSTMENT

1. Use the cross-dot pattern from among the built-in test sig-

nals.

2. Set the brightness and contrast for well defined pattern.

3. Adjust two tabs of the 4-Pole Magnets to change the an-

gle between them (See figure 2.) and superimpose red

and blue vertical lines in the center area of the picture

screen.

4. Turn the both tabs at the same time keeping the angle

constant to superimpose red and blue horizontal lines at

the center of the screen.

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

blue line and green one. Adjusting the angle affects the

vertical lines and rotating both magnets affects the hori-

zontal lines.

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

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

Magnets have mutual interaction and make dot movement

complex.

4-POLE

MAGNETS

PURITY

MAGNETS

CONVERGENCE MAGNET ASSEMBLY

BLU

RED

4-POLE MAGNETS MOVEMENT

INCLINE THE YOKE UP (OR DOWN)

6-POLE

MAGNETS

ADJUST THE ANGLE

(VERTICAL LINES)

Figure 2.

BLU

RED

Center Convergence by Convergence Magnets

BGR

RGB

Circumference Convergence by DEF Yoke

Figure 3. Dot Movement Pattern

CIRCUMFERENCE CONVERGENCE ADJUSTMENT

1. Loosen the clamping screw of deflection yoke slightly to

allow the yoke to tilt.

2. Temporarily put a wedge as shown in figure 1. (Do not

remove cover paper on adhesive part of the wedge.)

3. Tilt front of the deflection yoke up or down to obtain better

convergence in circumference. (See figure 3.) Push the

mounted wedge into the space between picture tube and

the yoke to fix the yoke temporarily.

4. Put other wedge into bottom space and remove the cover

paper to stick.

5. Tilt front of the yoke right or left to obtain better conver-

gence in circumference. (See figure 3.)

6. Keep the yoke position and put another wedge in either

upper space. Remove cover paper and stick the wedge

on picture tube to fix the yoke.

7. Detach the temporarily mounted wedge and put it in an-

other upper space. Stick it on picture tube to fix the yoke.

8. After fixing three wedges, recheck overall convergence.

Tighten the screw firmly to fix the yoke and check the yoke

is firm.

9. Stick three adhesive tapes on wedges as shown in figure

FIXED

ROTATE TWO TABS

AT THE SAME TIME

(HORIZONTAL LINES)

ADJUSTMENT OF MAGNETS

RED/BLU GRN

RED/BLU

GRN

6-POLE MAGNETS MOVEMENT

BGR

INCLINE THE YOKE RIGHT (OR LEFT)

– 5 –

RGB