Panasonic CT30WC14J - 30" COLOR TV, Service Manual

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PURITY ADJUSTMENT
When the receiver is in the serviceman 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.
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
Green raster adjustment
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 and red screens
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
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.
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