Service manual

SERVICE MANUAL

ADJUSTMENTS

Set-up Adjustments

 The following adjustments should be made when a complete realignment is required or a new CRT

is installed. Perform the adjustments in order as follows.

1. Colour purity

2. Convergence

3. White Balance

Note:

The purity/convergence magnet assembly and rubber wedges need mechanical positioning. Refer to

Fig. 1, 2.

1. Colour Purity Adjustment

Note:

Before attempting any purity adjustment, the TV should be operated for at least 15 minutes.

1) Demagnetize the CRT and cabinet using a degaussing coil.

2) Set the brightness and contrast to maximum.

3) Receive the green raster pattern.

4) Loosen the clamp screw holding the deflection yoke and slide it backward or forward to display

vertical green belt (zone) on the screen.

5) Remove the rubber wedge.

6) Rotate and spread the tabs of the purity magnet around the neck of the CRT until the green belt is on

the center of the screen.

7) Slowly move the deflection yoke forward or backward until a uniform green screen is obtained.

Tighten the clamp screw of the yoke temporarily.

8) Check purity of the red and blue raster.

Glass Cloth Tapes

Purity/Convergence

Magnet Module

Deflection Yoke

Adhesive

Rubber

Deflection Yoke

Dummy Wedge

Fig. 1