SAMSUNG CHT-420
Manual de Servicio

Alignment and Adjustments

2-2-2(b) SKEW Adjustment Method Needed to minimize the variations in Skew of the Pick-up unit and to provide optimum match with the recorded signal on the Disc. 1) Remove the Ass�y Deck. Place the Ass�y Deck on a flat horizontal position. 2) Connect an Oscilloscope to the �ENV� Test Point. (See Fig. 2-5) � Set the Oscilloscope Range as follows : (Voltage ; 50mV/Div., Frequency ; 10m Sec.) 3) Connect Power, Open the Tray and Play the TDV-533 Disc, Chapter 14. 4) Adjust the Screws �A� and �B� (See Fig. 2-6) using a Hex screwdrvier until you obtain a Flat Waveform and the picture is stable. Then, go to Chapter 1 and make sure the Waveform is Flat here as well. If not, you have to go back to Chapter 14 and adjust again. If you cannot obtain a Flat waveform, then the unit is defective. Note : The Deck must be in a horizontal position. Use both �A� and �B� screws to adjust, but mostly �A�.

Typical Waveform before Adjustment

Waveform after Correct Adjustment

Fig. 2-7 Envelope Waveform

2-6

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