- 16 -
Adjust the Purity rings to set the vertical green raster
precisely at the center of the screen (see Fig. 13).
Slowly move the deflection yoke forward until the best
overall green screen is displayed.
Tighten the deflection yoke clamp screw.
Press the Recall button on the Remote Control again
until the purity check (blue screen) and (red screen)
appear and observe that good purity is obtained on
each respective field.
Press the Recall button on the Remote Control again
until Purity check (white screen) appears. Observe the
screen for uniform white. If purity has not been
achieved, repeat the above procedure.
Final Convergence Procedure
(see Fig. 14
through Fig. 16):
Note: Vertical size and focus adjustments must be
completed prior to performing the convergence
adjustment. Connect a dot pattern generator to the
Receiver. The Brightness level should not be higher
than necessary to obtain a clear pattern.
Converge the red and the blue dots at the center of the
screen by rotating the R&B pole Static Convergence
Magnets.
Align The converged red/blue dots with the green dots
at the center of the screen by rotating the R&B&G pole
Static Convergence Magnets. Melt wax with soldering
iron to reseal the magnets.
Slightly tilt vertically and horizontally (do not rotate) the
deflection yoke to obtain a good overall convergence.
If convergence is not reached at the edges, insert
permalloy (see following section) from the DY corners
to achieve proper convergence. Recheck for purity and
readjust if necessary.
After vertical adjustment of the yoke, insert wedge at 11
o’clock position, then make the horizontal
tilt adjustment.
Secure the deflection yoke by inserting two side
wedges at 3 and 7 o’clock positions.
Apply adhesive between tab (thin portion) of wedge
and CRT and place tape over the tab to secure to
the CRT.
Permalloy Convergence Corrector Strip
(Part No. 0FMK014ZZ)
This strip is used in some sets to match the yoke and
CRT for optimum convergence. If the yoke or CRT is
replaced, the strip may not be required.
First converge the set without the strip and observe
the corners.
If correction is needed:
1.
Place strip between CRT and yoke, in quadrant
needing correction. Slowly move it around for
desired results.
2.
Press adhesive tightly to the CRT and secure
with tape.
NOTES:
1. CRT warm up with white screen
(three guns activated) is needed
to stabilize the shadow mask
expansion.
2. Initial center static convergence
(roughly centers three gun
beams) is required in order to
perform purity adjustment.
Figure 13. Green Raster Adjustment
Green Raster