Denon AVR-4810CI Service Manual page 73

6.2. USB device is not recognized
Are the USB port settings correct?
Are you using a USB hub?
Is the USB device compatible with the set?
Is the wire properly connected between CX052 and CY052?
Is a voltage (5V) being supplied between pins 1 and 4 of JK451
(back panel USB connector) and JK981 on the 8U-210063-3 cir-
cuit board (front panel USB connector)?
Is the USB device not recognized for both the front and rear con-
nectors?
YES
Is theCW302 pin 24 output level "H"?
The network module may be defective.
Checking the settings
YES
Checking the USB device
NO
YES
Checking the set (AVR-4810CI)
YES
YES
Rear is not recognized
Front is not recognized
YES
AVR-4810CI/AVR-4810
NO
Set the front and rear properly.
YES
You do not use the USB hub.
Only mass storage devices in FAT16 or FAT32 formats or MTP-
NO
compatible devices and iPod (Remove some models) are sup-
ported.
NO
Connect the wire properly.
NO
The TR452 and TR453 periphery circuitry is defective.
The circuit from IC462 to JK451 is defective.
The circuitry from IC462 to JK981 on the 8U-210063-3 circuit
board is defective.
The circuitry from IC701 on the 8U-210064 circuit board to
NO
CX302 is defective.
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