CD-SW330
7 – 2
Although a CD is inserted and the cover is closed, "NO DISC" is displayed.
(1) Focus-RF system check.
1. Does the pickup move? No Sled motor (M2A).
Yes
2. Does the focus (lens) move up and down ?
(Waveform drawing Figure 1)
No Check the focus peripheral circuit.
Yes
3. Is the laser lit ? No Check the laser diode driver Q1 peripheral circuit.
Yes
4. Is the turntable rotating ? No Spindle motor (M1A).
When a disc is loaded, start playback operation.
1. Is focus servo activated ?
(Waveform drawing Figure 2)
No Pins 5, 9, 94 and 95 on IC1, Pins 1, 2, 15 and 16 on IC2.
Check the laser diode driver Q1 peripheral circuit.
Yes
2. Is the RF waveform normal ?
(Waveform drawing Figure 3)
No If the level is not normal.
Press the Tray1 CD Eject Button without inserting a disc, and try
starting the playback operation.
Figure 1
Figure 2
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