Denon AVR-E400 Service Manual page 93

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 N2801 on the HDMI board
and CN4402 on the USB board.
Is a voltage (5V) supplied between the pins 1 and 4 of CP4406 on the
USB board (USB connector)?
The circuitry from U2602 on the HDMI board to CP4406 on the USB
board is defective.
5.3. No picture or no sound is output
Are digital video signals(BCLK, VD0 - VD7) output from U2602 to
U1601?
Check the HDMI/DVI circuit.
Are I2S signals output to U2401 pin 12, 13, 14, 15?
Are audio signals output to IC4200 pin 62 and 63?
Check the Analog audio circuit.
Checking the USB device
NO
YES
Checking the set (AVR-E400/X2000)
YES
YES
Checking the set (AVR-E400/X2000):(If no picture is output)
YES
Checking the set (AVR-E400/X2000):(If no sound is output)
YES
YES
YES
Don't use the USB hub.
Only mass storage devices in FAT16 or
NO
FAT32 format or MTPcompatible devices
and iPod (Remove some models) are
supported.
NO
Connect the wire properly.
NO
The U2806 and surrounding circuitry on the
HDMI board are defective.
NO
U2602 and surrounding circuitry are
defective.
NO
U2602 and surrounding circuitry are
defective.
NO
U2401 and surrounding circuitry are
defective.
93