Colour Purity And Convergence Adjustment - Panasonic TC-21FX30LA Service Manual

TC-21FX30LA/LP / TC-29FX30LA/LP
Before Colour Purity, Convergence and White Balance adjustment are attempted,
Colour Purity
1. Set the Brightness and Contrast controls to their maximum
positions.
2. Operate the TV set for 60 minutes.
3. Fully degausse the picture tube by using an external
degaussing coil.
4. Apply a crosshatch pattern signal and adjust the static
convergence magnets to the approximately correct position.
5. Receive a black and white signal.
6. Set the control as follows:
Red................minimum
Green.............minimum
Blue...............minimum
Press the Shipping button on the remote control twice to
select CRT Adjustment Mode to select low light.
7. Loosen the clamp screw for the Deflection Yoke A in Fig.
10 and move the Deflection Yoke as close to the purity
magnet as possible.
8. Adjust the purity magnetic rings so that a vertical green
field is obtained at the centre of the screen.
Colour Purity
Green
Purit magnet
9. Slowly push the Deflection Yoke and set it where a uniform
green field is obtained.
10. Re-adjust the Low Light controls to their correct settings
and make sure that a uniform white field is obtained.
11. Tighten the clamp screw A in Fig. 10.
V. Height, H. Centre and Focus adjustments must be completed.
Green Field
Fig.5
Uniform
Green
Fig.6
1. Apply a crosshatch pattern signal and Normalize Contrast
control to the maximum positions.
2. Adjust Brightness until the grey position of the crosshatch
pattern just becomes black.
3. Adjust the Red and Blue line at the centre of the screen by
rotating the R-B static.
Vertical Slide magnetic tabs toward or away
Convergence
from each other.
Red & Blue
Totate both magnetic rings together
Horizontal
Convergence
Red 7 Blue
4. Adjust Red and Blue with Green line at centre of the screen
by rotating (RB)-G static convergence magnetic rings.
5. Lock convergence magnets with silicone sealer.
6. Remove the DY wedges and slightly tilt the Deflection Yoke
vertically and horizontally to obtain the good overall
convergence.
7. Fix the Deflection Yoke by reinserting the DY wedges.
Refer to Fig. 10.
8. If purity error is found, repeat "Colour Purity" adjustment.
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Convergence
R-B Static
Convergence Magnet
R-B Static
Convergence magnet
Fig.7
Fig.8