Panasonic CT-36SX31E, CT-36SX31CE, CT-32SX31E Initial Center Static Convergence, Purity Adjustment

Initial Center Static Convergence

Connect a dot/cross hatch generator to the Receiver and tune in a signal. Observe misconvergence at center of the screen only.

Adjust the R&B pole magnets; by separating tabs and rotating to converge blue with red.

Adjust the R&B and R&B&G pole magnets: by separating tabs and rotating to converge blue and red (magenta) with green.

Note: Precise convergence at this point is not important.

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 (see Fig .12).

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 12. Green Raster Adjustment Green Raster

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 (see Fig. 17

through Fig. 19):

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.

Dynamic Corvergence Adjustment

Use this for a precisely overall convergence adjust at the edges.

DY(YHC, YV, XV) Adjustment

YV Adjustment (VR1 for Horizontal dynamic convergence)

1.Apply a crosshatch pattern.

2.Adjust contrast and brightness customer controls to obtain a correct picture.

3.With a driver adjust VR1 (located in deflection yoke board Fig. 19) to obtain a proper corvergence at top and bottom of the screen (See Fi g.13)

B&R

G

B&R

G

B&R

G

B&R

G

Figure 13. VR1 Adjustment (YV)

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