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8-10 Check that the image is horizontal.
If needed, rotate the deflection yoke.
8-11 Recheck the purity adjustment. If purity was adversely affected repeat the purity
adjustment, then recheck convergence when finished.
8-12 Retighten the deflection yoke fastening screw. Do not overtighten the screw, as this
can damage the CRT.
Tightening torque:20 ±2 kgf.cm
8-13 Align the horizontal line convergence at the center of the screen with the Differential
coil (See STEP-6 in figure for examples).
8-14 Align the horizontal line convergence at the corner and of the screen with the
Differential resistor VR-YV. (See STEP-7 in figure for examples.)
8-15 Align the center vertical line convergence at the corner of the screen with the Vertical
Isotropic Astigmatism resistor VR-YH (See STEP-8 in figure for examples).
8-16 Align the center vertical line convergence at the corner of the screen with the vertical
ISO tropic astigmatism resister VR-YH (See step-9 in figure for examples for 19”
only).
8-17 Recheck convergence at the center of the screen. If needed, realign with the Four-
pole magnet A and the Six-pole magnet.
8-18 Insert wedges as shown is STEP-9 of figure (at the top, bottom, and right side of the
deflection yoke). Secure them with silicon adhesive and polyester tape. Remove any
temporary wedges while keeping convergence aligned.
8-19 If the convergence on the fringe areas in still not acceptable, place one or more
Permalloys around the funnel to achieve the best effect. Then press these Permalloys
onto the funnel. Verify convergence around all edges of the screen. (See STEP-10 in
figure for examples).
NOTE
In the above step, do not place the Permalloys closer than 20 mm from the HV
anode cap. Do not tape them over any paper labels or secure them with silicon
adhesive.
8-20 After completion of adjustment, apply locking paint to the movable portions of the
deflection and convergence yokes to secure them.
8-21 Make adjustment so that the value of white window pattern from the signal generator
is below that under the condition of 100 cd/m
2
brightness at the standard condition.
V YV
ET 17”
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