NXP Semiconductors TDA9351 SERIES Service Manual
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208. PURITY / CONVERGENCE ADJUSTMENTPURITY ADJUSTMENT1. 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.5. Move the deflection yoke backward.6. Bring the long lug of the purity magnets on the shortlug and position them horizontally. (Fig2)7. Adjust the gap between two lugs so that the GREENRASTER will come into the center of the screen. (Fig.3)8. Move the deflection yoke forward, and fix the positionof the deflection yoke so that the whole screen willbecome green.9. Insert the wedge to the top side of the deflection yokeso that it will not move.10. Imput a crosshatch signal.11. Verify that the screen is horizontal.12. Input red and blue raster signals, and make sure thatpurity is properly adjusted.CRTWEDGEDEFLECTION YOKEP4 6P: PURITY MAGNET4: 4-POLES (convergence magnets)6: 6-POLES (convergence magnets)P/C MAGNETSFig. 1PURITY MAGNETSLong lugShort lugBring the long lug over the short lugand position them horizontally.Fig. 2(FRONT VIEW)GREEN RASTERCENTERFig. 3 |
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