Marantz AV7701 Service Manual page 108

5.2. USB device is not recognized
Are you using a USB hub?
Is the USB device compatible with the set?
Is the wire properly connected between CN321 on the HDMI board
and BN321 on the FRONT board.
Is a voltage (5V) being supplied between pins 1 and 4 of JK604 on
the FRONT board (USB connector)?
The circuitry from IC390 on the HDMI board to JK604 on the FRONT
board is defective.
5.3. No picture or sound is output
Are S/PDIF signals output to IC406 90pin?
Check the Digital audio circuit.
Checking the USB device
NO
YES
Checking the set (AV RECEIVER)
YES
YES
Checking the set (AV RECEIVER):(If no sound is output)
YES
YES
Don't 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 IC320 and surrounding circuitry on the
HDMI board is defective.
NO
IC390 and surrounding circuitry is defective.
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