Sanyo DS25520 Service Manual

Also see for DS25520: Owner's manual Owner's manual Owner's manual Manual Manual

Contents

Sanyo DS25520 Service Manual Manual pdf 11 page image

— 11 —BLUEGREENREDBLUEGREENREDBLUEGREENREDBLUEGREENREDLine movement when adjustingside of yoke in and out.CENTER CONVERGENCE ADJUSTMENT1. Connect a crosshatch generator to antenna terminals.2. Set Contrast to low level to eliminate blooming. ReduceBrightness level to obtain black background if necessary.3. Adjust the angle between the four-pole magnet tabs 1and 2 (Figure 2), and superimpose the red and blue ver-tical lines in the center area of the picture screen. SeeFigure 4.4. Keeping the tabs at the same angle, rotate them togetherto superimpose the blue and red horizontal lines in thecenter area of the picture screen. See Figure 4.5. Adjust the six-pole magnet tabs 3 and 4 so the con-verged red/blue line is superimposed on the green line.This is the same procedure used in steps 3 and 4. SeeFigure 5.CONVERGENCE ADJUSTMENTBLUEREDAdjust four-pole tabs angle tosuperimpose blue and red verticalline.Adjust four-pole tabs togetherto superimpose red and bluehorizontal line.Figure 4. Blue and Red Line MovementBLUE / REDGREENAdjust six-pole tabs angle tosuperimpose red / blue andgreen vertical line.Adjust six-pole tabs togetherto superimpose red / blue andgreen horizontal line.REDGREENBLUEREDGREENBLUELine movement when adjustingtop of yoke in and out.Figure 7. Side of Yoke MovementOUTER AREA CONVERGENCE ADJUSTMENTThe outer area convergence is performed by positioning ofthe yoke as follows:1. Move the top of the yoke toward or away from the pic-ture tube. This movement will affect the vertical lines atthe top and bottom and the horizontal lines at the sides.See Figure 6.2. Check that splits at 12 o’clock and 6 o’clock positionsare minimized, adjust yoke for best compromise.Secure with wedge at 12 o’clock position. See Figure 1.3. Move the side of the yoke toward or away from the pic-ture tube to converge the horizontal lines at the top andbottom and the vertical lines at the sides. See Figure 7.4. Check that splits at 12 o’clock and 6 o,clock are mini-mized, adjust yoke for best compromise. Secure yokeposition with the side wedges. See Figure 1.Note: When re-using the rubber wedges, apply a smallamount of silicone rubber adhesive or hot melt toeach of the wedges.Figure 6. Top of Yoke MovementFigure 5. Blue/Red and Green Line Movement