Panasonic TC-21FX30LA Service Manual

- 20 -TC-21FX30LA/LP / TC-29FX30LA/LPBefore Colour Purity, Convergence and White Balance adjustment are attempted,V. Height, H. Centre and Focus adjustments must be completed.Colour Purity1. Set the Brightness and Contrast controls to their maximumpositions.2. Operate the TV set for 60 minutes.3. Fully degausse the picture tube by using an externaldegaussing coil.4. Apply a crosshatch pattern signal and adjust the staticconvergence magnets to the approximately correct position.5. Receive a black and white signal.6. Set the control as follows:Red................minimumGreen.............minimumBlue...............minimumPress the Shipping button on the remote control twice toselect 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 puritymagnet as possible.8. Adjust the purity magnetic rings so that a vertical greenfield is obtained at the centre of the screen.9. Slowly push the Deflection Yoke and set it where a uniformgreen field is obtained.10. Re-adjust the Low Light controls to their correct settingsand make sure that a uniform white field is obtained.11. Tighten the clamp screw A in Fig. 10.Convergence1. Apply a crosshatch pattern signal and Normalize Contrastcontrol to the maximum positions.2. Adjust Brightness until the grey position of the crosshatchpattern just becomes black.3. Adjust the Red and Blue line at the centre of the screen byrotating the R-B static.4. Adjust Red and Blue with Green line at centre of the screenby rotating (RB)-G static convergence magnetic rings.5. Lock convergence magnets with silicone sealer.6. Remove the DY wedges and slightly tilt the Deflection Yokevertically and horizontally to obtain the good overallconvergence.7. Fix the Deflection Yoke by reinserting the DY wedges.Refer to Fig. 10.8. If purity error is found, repeat “Colour Purity” adjustment.Fig.5Fig.6Colour PurityGreenPurit magnet Green FieldUniformGreenVerticalConvergenceRed & BlueTotate both magnetic rings togetherR-B StaticConvergence MagnetHorizontalConvergenceRed 7 BlueR-B StaticConvergence magnetFig.7Fig.8Slide magnetic tabs toward or awayfrom each other.