Denon AVR-3808CI Service Manual page 42

Q Q
4.2. USB device is not recognized 3 7 6 3 1 5 1 5 0
Checking the settings
Are the USB port settings correct?
YES
Checking the USB device
Are you using a USB hub?
NO
Is the USB device compatible with the set?
YES
Is the wire properly connected between CX053 and CY053?
YES
T E
L 1 3 9 4 2 2 9 6 5 1 3
Is a voltage (5V) being supplied between pins 1 and 4 of JK402 (back
panel USB connector) and JK704 on the 1U-3800-5 circuit board (front
panel USB connector)?
YES
Is the USB device not recognized for both the front and rear connec-
tors?
YES
Is the IC411 pin 15 output level "L"?
YES
The circuit from IC405 to IC411 is defective.
w w w
.
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-compat-
NO
ible devices are supported.
Checking the set
NO
Connect the wire properly.
NO
The IC415 periphery circuitry is defective.
Rear is not recognized
The circuit from IC411 to JK402 is defective.
Front is not recognized
The circuitry from IC411 to JK705 on the 1U-3800-5 circuit board is
defective.
The circuitry from IC701 on the 1U-3804-2 circuit board to IC441 on
NO
the 1U-3779 circuit board is defective.
x a o
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3 7 6 3
YES
u 1 6 3
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9 2 4 9 8
NO
YES
YES
NO
NO
YES
NO
YES
1 5 1 5 0 8 9 2 4
NO
YES
NO
YES
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AVR-3808CI / AVR-3808 / AVC-3808
2 9 9
9 8 2 9 9