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The following 2 adjustments normally are not attempted in the field. They should be done only when replacing the CRT then adjust as a preparation.
15. Convergence Adjustment
Purpose: To obtain proper convergence of red, green and blue beams. Symptom of Misadjustment: If Convergence Adjustment is incorrect, the edge of white letters may have color edges. Test point --Tape --Adj. Point C.P. Magnet (RB), C.P. Magnet (RB-G), Deflection Yoke M. EQ. Pattern Generator Figure
DEFLECTION YOKE CRT COIL PURITY SCREW RB RB-G RING LOCK SCREW
14. Purity Adjustment
Purpose: To obtain pure color. Symptom of Misadjustment: If Color Purity Adjustment is incorrect, large areas of color may not be properly displayed. Test point --Tape --Adj. Point Deflection Yoke Purity Magnet M. EQ. Pattern Generator Figure Mode --Input *Red Color Spec. See below.
Mode ---
Input Dot Pattern or Crosshatch Spec.
See below.
GREEN
RED
BLUE
DY WEDGE C.P. MAGNET CLAMPER COIL CLAMPER C.P. MAGNET
Fig. 7 * This becomes RED COLOR if push 7KEY with a service mode. 1. Set the unit facing east. 2. Operate the unit for over 30 minutes before adjusting. 3. Fully degauss the unit using an external degaussing coil. 4. Set the unit to the AUX Mode which is located before CH2 then input a red raster from video in. 5. Loosen the screw on the Deflection Yoke Clamper and pull the Deflection Yoke back away from the screen. (See Fig. 8.) 6. Loosen the Ring Lock and adjust the Purity Magnets so that a red field is obtained at the center of the screen. Tighten Ring Lock. (See Fig. 7,8.) 7. Slowly push the Deflection Yoke toward the bell of the CRT and set it where a uniform red field is obtained. 8. Tighten the clamp screw on the Deflection Yoke.
C.P. MAGNET (RB) R G B C.P. MAGNET (RB-G) RB RB G B R
Fig. 8
G
Fig. 9
G Fig. 10
1. Set the unit to the AUX Mode which is located before CH2 then input a Dot or crosshatch pattern. 2. Loosen the Ring Lock and align red with blue dots or Crosshatch at the center of the screen by rotating (RB) C.P. Magnets. (See Fig. 9.) 3. Align red / blue with green dots at the center of the screen by rotating (RB-G) C.P. Magnet. (See Fig. 10.) 4. Fix the C.P. Magnets by tightening the Ring Lock. 5. Remove the DY Wedges and slightly tilt the Deflection Yoke horizontally and vertically to obtain the best overall convergence. 6. Fix the Deflection Yoke by carefully inserting the DY Wedges between CRT and Deflection Yoke.
1-7-7
TD701EA
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