CD-DH790N
7 – 2
3. When the USB does not function.
3.1. “NO MEDIA” is displayed.
1) Check the power to U10 (92L117ALiM5601) and
CNP602 connector.
2) Check the system microcomputer (especially the
communication line with the USB Host).
3) Check the grounding condition to U10
(92L117ALiM5601) and CNP602 connector.
4. When a USB cannot be played.
4.1. Pressing the USB operation key is accepted,
but playback data does not occur.
1) DM data line.
2) DP data line.
3) Others.
Although a CD is inserted and the cover is closed,
"NO DISC" is displayed.
(1) Focus system check.
Press the Tray1 CD Eject Button without inserting a disc, and try
starting the playback operation.
Figure 1
126
127
1. Does the pickup move? No Sled motor.
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 Q5 peripheral circuit.
Yes
4. Is the turntable rotating? No Spindle motor.
When a disc is loaded, start playback operation.
1. Is focus servo activated?
(Waveform drawing Figure 2)
No Pins 4, 7, 13 and 126 on U10, Pins 1, 13 and 14 on U12.
Check the laser diode driver Q5 peripheral circuit.
Figure 2
U10
U10
U10
126
14
13
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