Denon AVR-X4000 Service Manual page 106

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 DIGITAL B'D
and BN321 on the USB board.
Is a voltage (5V) being supplied between pins 1 and 4 of JK608 on
the USB board (USB connector)?
The circuitry from IC390 on the DIGITAL B'D to JK608 on the USB
board is defective.
5.3. No picture or sound is output
Are S/PDIF signals output to IC406 30pin?
Check the Digital audio circuit.
Are video signals output at test point BCLK, VD7-VD0?
Check the HDMI circuit.
Are video signals output from IC323 pin 30?
Check the analog video 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
Checking the set (AV RECEIVER):(If no picture is output from HDMI)
YES
Checking the set (AV RECEIVER):(If no picture is output from CVBS)
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
DIGITAL B'D is defective.
NO
IC390 and surrounding circuitry is defective.
The circuit between IC390 and IC151 is
NO
defective.
The circuit between IC390 and IC323 is
NO
defective.
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