Toshiba 13A20 Manual de servicio - Página 9

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WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAU-

TION" AND "PRODUCT SAFETY NOTICE" ON PAGE 3 OF THIS MANUAL.

SET-UP ADJUSTMENT FOR 35", 36".

The following adjustments should be made when a complete realignment is required or a new picture tube is installed.

Perform the adjustments in order as follows :

1. Color Purity

2. Convergence

3. White Balance

Note: The PURITY/CONVERGENCE MAGNET assembly and rubber wedges need mechanical positioning.

Refer to figure 1.

Mounting position of the purity magnet assembly should fit to same position as old one because slightly difference to

the position depend on a kind of tube.

There are no adjustment of purity and convergence in some picture tube (Unified with purity magnet)

COLOR PURITY ADJUSTMENT

NOTE : Before attempting any purity adjustments, the

receiver should be operated for at least fifteen

minutes.

1. Evenly degauss the entire screen.

2. Set the CONTRAST and BRIGHTNESS Controls to

the maximum.

3. Display built-in green raster using the TEST SIGNAL

SELECTION function.

4. Loosen the clamp screw holding the deflection yoke

(and remove the Rubber Wedges).

5. Slide the yoke forward or backward to provide vertical

green belt (zone) in the picture screen.

6. Rotate and spread the tabs of the purity magnet (See

figure 4.) around the neck of the picture tube until the

green belt is in the center of the screen. At the same

time, center the raster vertically by adjusting the mag-

net as shown below.

Green Belt

7. Move the yoke slowly forward or backward until a uni-

form green screen is obtained. Tighten the clamp screw

of the yoke temporarily.

8. Check the purity of the red and blue raster.

9. Put four wedges into the space between the picture

tube and the yoke to hold the yoke in the adjusted

position. (See figure 2.)

Do not tilt the yoke by excessive insertion of the wedge.

10. Remove cover paper of wedge and stick wedges on

the tube to fix the yoke in the adjusted position.

Fix the wedges with glass cloth tapes.

Xv Coil

Figure 1.

– 6 –

DEFLECTION YOKE

1-5/8"

PURITY/

CONV.

MAGNET

RUBBER WEDGES

Adhesive

DEFLECTION

YOKE

Figure 2.