14
HCD-DX10/RG4SR/RG20/RG30T
CN732
CN733
CN731
TP connected to pin
q;
(IC751)
C746A
Adjustment Location: CD board
[CD BOARD] (Component Side)
CD SECTION
RF Level Check
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.
IC751 pin q;
GND
CD board
oscilloscope
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
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 10MΩ 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.
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