Toshiba 13A24 Service Manual

Also see for 13A24: Owner's manual Owner's manual Owner's manual

ELECTRICAL ADJUSTMENTSD-33. PURITY AND CONVERGENCEADJUSTMENTSNOTE1.2.3.Turn the unit on and let it warm up for at least 30minutes before performing the following adjustments.Place the CRT surface facing east or west to reduce theterrestrial magnetism.Turn ON the unit and demagnetize with a Degauss Coil.3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)1.2.3.4.5.6.7.8.Tighten the screw for the magnet. Refer to the adjustedCRT for the position. (Refer to Fig. 3-1)If the deflection yoke and magnet are in one body,untighten the screw for the body.Receive the green raster pattern from the color bargenerator.Slide the deflection yoke until it touches the funnel sideof the CRT.Adjust center of screen to green, with red and blue onthe sides, using the pair of purity magnets.Switch the color bar generator from the green rasterpattern to the crosshatch pattern.Combine red and blue of the 3 color crosshatchpattern on the center of the screen by adjusting the pairof 4 pole magnets.Combine red/blue (magenta) and green by adjusting thepair of 6 pole magnets.Adjust the crosshatch pattern to change to white byrepeating steps 6 and 7.3-2: PURITYNOTEAdjust after performing adjustments in section 3-1.1.2.3.4.5.Receive the green raster pattern from color bar generator.Adjust the pair of purity magnets to center the color onthe screen.Adjust the pair of purity magnets so the color at the endsare equally wide.Move the deflection yoke backward (to neck side)slowly, and stop it at the position when the whole screenis green.Confirm red and blue color.Adjust the slant of the deflection yoke while watching thescreen, then tighten the fixing screw.DEFLECTION YOKEDEFLECTION YOKE SCREWMAGNET SCREWPURITY MAGNETS6 POLE MAGNETS4 POLE MAGNETSFig. 3-13-3: STATIC CONVERGENCENOTEAdjust after performing adjustments in section 3-2.1.2.3.Receive the crosshatch pattern from the color bargenerator.Combine red and blue of the 3 color crosshatchpattern on the center of the screen by adjusting the pairof 4 pole magnets.Combine red/blue (magenta) and green by adjusting thepair of 6 pole magnets.3-4: DYNAMIC CONVERGENCENOTEAdjust after performing adjustments in section 3-3.1.2.Adjust the differences around the screen by moving thedeflection yoke upward/downward and right/left.(Refer to Fig. 3-2-a)Insert three wedges between the deflection yoke andCRT funnel to fix the deflection yoke.(Refer to Fig. 3-2-b)R G BRGB RGBR G BUPWARD/DOWNWARD SLANT RIGHT/LEFT SLANTFig. 3-2-aWEDGE WEDGEWEDGEWEDGE POSITIONFig. 3-2-b