SONY MHCRG20
Manual de Servicio

HCD-DX10/RG4SR/RG20/RG30T

CD SECTION
Note :

1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10M� impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks. RF Level Check
oscilloscope CD board IC751 pin q; GND

Procedure : 1. Connect oscilloscope to pin q; (IC751). 2. Turned Power switch on. 3. Load a disc (YEDS-18) and playback. 4. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.
Note : Clear RF signal waveform means that the shape � � � can be clearly distinguished at the center of the waveform.

RF signal waveform VOLT/DIV : 200mV TIME/DIV : 500ns

level : 1.4 to 2.1 Vp-p

Adjustment Location: CD board [CD BOARD] (Component Side)
CN732

CN731 TP connected to pin q; (IC751) C746A

CN733

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