Sony HCD-RG66 Service Manual page 17

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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 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.
RF Level Check
BD board
IC751 pin q;
Procedure :
1. Connect an oscilloscope to pin q; (IC751).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback the number five track.
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
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L 13942296513
Adjustment Location: BD board
[BD BOARD] (Component Side)
CN731
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oscilloscope
GND
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.4 to 2.1 Vp-p
IC731
TP731:
TP connected to pin q; (IC751)
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HCD-RG66
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