Usb Device Is Not Recognized - Denon AVR-3311CI Service Manual

5.2. USB device is not recognized

Are you using a USB hub?
Is the USB device compatible with the set?
Is the wire of N4201 properly connected?
Is a voltage (5V) being supplied between pins 1 and 4 of Jack602
on the USB circuit board (USB connector)?
The circuitry from U3990 on the HDMI circuit board to Jack602 on the
USB circuit board is defective.
Checking the USB device
NO
YES
Checking the set (AVR-3311CI)
YES
YES
YES
You do not use the USB hub.
Only mass storage devices in FAT16 or
NO
FAT32 formats or MTPcompatible devices
and iPod (Remove some models) are
supported.
NO
Connect the wire properly.
NO
The Q4200 and surrounding circuitry on the
HDMI cirucuit board is defective.
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