Denon AVR-4520, Service Manual

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5.2. USB device is not recognized
Checking the settings
YES
NO
YES
Is the USB device compatible with the set?
Are the USB port settings correct?
Are you using a USB hub?
Only mass storage devices in FAT16 or
FAT32 formats or MTPcompatible devices
and iPod (except some models) are
supported.
Set the front and rear properly.
Don't use the USB hub.
NO
NO
YES
Checking the set (AVR-4520)
Checking the USB device
YES
YES
YES
Is a voltage (5V) being supplied between pins 1 and 4 of N601 (back
panel USB connector) and N603 on the USB B'D circuit board (front
panel USB connector)?
Is the USB device not recognized for both the front and rear
connectors?
The circuitry from U503 or U503 to U606 are defective.
Is the wire properly connected between N603 and N801?
The U603 and U604 periphery circuitry is
defective.
The circuit from U604 to N601 is defective.
The circuitry from U603 to N602 on the USB
B'D circuit board is defective.
Connect the wire properly.
NO
NO
Rear is not recognized
Front is not recognized