JVC AV21D31/PH
Service Manual

AV-21D11 AV-21D31

PURITY!/ CONVERGENCE! ADJUSTMENT ! !
PURITY ADJUSTMENT
1. Demagnetize CRT with the demagnetizer.
WEDGE DEFLECTION YOKE
P

2. Loosen the retainer screw of the deflection yoke.

3. Remove the wedges.
CRT

4. Input a green raster signal from the signal generator, and turn the screen to green raster. 5. Move the deflection yoke backward.

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P/C MAGNETS

6. Bring the long lug of the purity magnets on the short lug and position them horizontally. (Fig.2)

$ P/C MAGNETS P : PURITY MAGNET 4 : 4 POLES (convergence magnets) 6 : 6 POLES (convergence magnets) Fig.1

7. Adjust the gap between two lugs so that the GREEN RASTER will come into the center of the screen. (Fig.3)

8. Move the deflection yoke forward, and fix the position of the deflection yoke so that the whole screen will become green.

9. Insert the wedge to the top side of the deflection yoke so that it will not move.
PURITY MAGNETS

10. Input a crosshatch signal.

Long lug

11. Verify that the screen is horizontal.
Short lug

12. Input red and blue raster signals, and make sure that purity is properly adjusted.

Bring the long lug over the short lug and position them horizontally.

Fig.2

(FRONT VIEW )

GREEN RASTER

��

CENTER

Fig.3

No.51846

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