JVC AV21LT3
Service Manual

AV-21LMT3 / AV-21LTR3 AV-21LT3 / AV-21LMG3 AV-2105EE

PURITY / CONVERGENCE ADJUSTMENT
PURITY ADJUSTMENT
1. Demagnetize CRT with the demagnetizer.
WEDGE

2. Loosen the retainer screw of the deflec tion yoke.
PURIT Y MAGNET (P)

3. Remove the wedges.

CRT
4. Input a green raster signal from the signal generator, and turn the screen to green raster.
DEFL ECTIO N YOKE

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CRT SOCKET PWB

P / C MAGNET S

5. Move the deflection yoke backward. # P/C MAGNETS 6. Bring the long lug of the purity magnets on the short lug and position them horizontally. (Fig.2) 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 c enter of the screen. (Fig.3)

8. Move the deflection yoke forward, and fix the pos ition of the deflection yoke so that the whole screen will bec ome green.
P RI YMG E U T A N TS

9. Ins ert the wedge to the top side of the deflection yoke so that it will not move.

10. Input a cross hatch signal.
S lug hort

11. Verify that the screen is horizontal.
Long ug l

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

Bring t he long lug over th e short lu g and position them horizont ally.

Fig.2

(FRONT VIEW)

GREEN RASTER

CENTER

Fig.3

No. 52030

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