Text preview for : 20031227092337859_CH2.pdf part of Samsung DVD-P241 Samsung Dvd-p241 Service Manual (Zoran Vaddis 6 Zr36768)



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2. Alignment and Adjustment
2-1 Location of Test Point

Pin 29 of RIC1

Fig. 2-1 Location of Test Point Samsung Electronics 2-1

Alignment and Adjustment

2-2 Skew Adjustment
2-2-1 Adjustment Spec. and Test Point
Test Disc TDV-533 Chapter 14 Adjustment Spec. Flat Waveform Test Point "Pin 29 of RIC1" (Main PCB - Component Side) (See Fig. 2-1) Test Disc ; Service not Available Adjustment Location Screw A / B Ass'y Deck - Top Side (See Fig. 2-2)

Fig. 2-2 Ass'y Deck (Top Side)

2-2

Samsung Electronics

Alignment and Adjustment

2-2-2 SKEW Adjustment Method
Needed to minimize the variations in Skew of the Pickup unit and to provide optimum match with the recorded signal on the Disc. 1) Connect an Oscilloscope to the "Pin 29 of RIC1" Test Point (See Fig. 2-1). 2) Connect Power, Open the Tray and Play the TDV-533 Disc, Chapter 14. Set the Oscilloscope Range as follows : (Voltage ; 20mV/Div., Frequency ; 10m Sec.) 3) Adjust the Screws "A" and "B" (See Fig. 2-2) using a Hex screwdriver 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.

Typical Waveform before Adjustment

Waveform after Correct Adjustment

Fig. 2-3 Envelope Waveform

Samsung Electronics

2-3

Alignment and Adjustment

MEMO

2-4

Samsung Electronics