2.7 Adjustment

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  1. Connect oscilloscope probe to TPL 2 (G OUT) with 10kΩ series resistor and adjust Contrast so that (B) as in Fig. 4 is 2.6 ± 0.1V.

  2. Adjust “Sub Colour” so that waveform as in Fig. 4 (1) 2.5 ± 0.1V.

  3. Connect oscilloscope probe to TPL 1 (R OUT) with 10kΩ series resistor and confirm waveform as in Fig. 5 is (2) 2.7 ± 0.4V.

  4. Take out jumper TPA 10 and TPA 20.

  5. Press digit key “5” (AKB ON) and confirm the OSD become white colour.

Before Colour Purity, Convergence and White Balance adjustment are attempted,
V. Height, H. Centre and Focus adjustments must be completed.

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.

    Fig. 6

  9. Slowly push the Deflection Yoke and set it where a uniform green field is obtained.

    Fig. 7

  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.

Convergence

  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.

    Fig. 8

  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.

    Fig. 9

  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. 10

Fig. 11

Notes:

  1. Wedge A, B and C should be inserted following the sequence of 1, 2 and 3 shown in Fig. 11.

  2. The wedges should be set 120° apart from each other.

  3. Be certain that three wedges are firmly fixed and the Deflection Yoke is tightly clamped in place.
    Otherwise the Deflection Yoke may shift its position and cause a loss of convergence and purity.


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