Denon AVR-3310CI Service Manual page 68

6.2. USB device is not recognized
Are the USB port settings correct?
Are you using a USB hub?
Is the USB device compatible with the set?
Is the wire properly connected between CX052 and CY052?
Is a voltage (5V) being supplied between pins 1 and 4 of JK981
on the 8U-210081-3 circuit board (USB connector)?
The network module may be defective.
Checking the settings
YES
Checking the USB device
NO
YES
Checking the set (AVR-3310CI)
YES
YES
AVR-3310CI/AVR-3310/AVR990/AVC-3310
NO
Set the front and rear properly.
YES
You do not use the USB hub.
Only mass storage devices in FAT16 or FAT32 formats or MTP-
NO
compatible devices and iPod (Remove some models) are sup-
ported.
NO
Connect the wire properly.
NO
The TR453 periphery circuitry is defective.
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