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Purity adjustment
When the receiver is in the service mode for making
electronic adjustments, press the recall button on the
remote control to enter purity check. (See the service
adjustments electronic controls procedure).
Operate the receiver for 60 minutes using the first
purity check field (white screen) to stabilize the CRT.
Fully degauss the receiver by using an external
degaussing coil.
Press the recall button on the remote control again
until the purity check (green screen) appears.
For a 2-piece assembly
Loosen the deflection yoke clamp screw and move the
deflection yoke back as close to the purity magnet as
possible.
Adjust the purity rings to set the vertical green raster
precisely at the center of the screen (see Fig. 9).
Figure 9. Green raster adjustment
Slowly move the deflection yoke forward until the best
overall green screen is displayed.
For a 1-piece assembly
Slowly move the deflection yoke and purity rings
assembly toward the CRT board and adjust the purity
magnet rings to set vertical green raster at center of
screen (see Fig. 9).
Gradually move the deflection yoke & purity rings
forward and adjust for best overall green screen.
Continue from here for either assemblies:
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.
:
(see Fig. 4)
:
(see Fig. 7)
- 12 -
Final convergence procedure
:
through Fig. 12)
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. Re-check for purity
and readjust if necessary.
After vertical adjustment of the yoke, insert wedge at 11
o'clock
position,
then
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.
(see Fig. 10
make
the
horizontal
tilt
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