JVC AV29LS
Service Manual

AV-29LS AV-29LH

AV-29LX AV-2908TEE

PURITY AND CONVERGENCE ADJUSTMENTS
Note: The final adjustment of CONVERGENCE must be done after the FOCUS adjustment. (CONVERGENCE is changed by FOCUS adjustment.) When makes difference by FOCUS adjustment, should be reconfirming PURITY adjustment.

WEDGE DEFLECTION YOKE

PURITY ADJUSTMENT
1. Demagnetize CRT with the demagnetizer. 2. Loosen the retainer screw of the deflection yoke. 3. Remove the wedges. 4. Input a green raster signal from the signal generator, and turn the screen to green raster. � P/C MAGNETS 5. Move the deflection yoke backward. 6. Bring the long lug of the purity magnets on the short lug and position them horizontally. (Fig. 2) 7. Adjust the gap between two lugs so that the GREEN RASTER will come into the centre 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. 10. Input a crosshatch signal. 11. Verify that the screen is horizontal.
Short lug Long lug
CRT

P

46

P/C MAGNETS

P : PURITY MAGNET 4 : 4 POLES (convergence magnets) 6 : 6 POLES (convergence magnets) Fig. 1

PURITY MAGNETS

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

CENTRE
Fig. 3

34

No. 51839