Denon AVR-X1200W Service Manual page 84

5.3. Cannot recognize the connected USB device
Is a USB hub being used?
Is the USB device supported by this unit?
Are CN804 of the DIGITAL PCB and BN104 of the USB PCB correctly
connected?
Can a voltage (5V) be confirmed between pin 1 and pin 4 of JK101
(USB Connector) on USB PCB?
The USB signal circuit between CY920 and JK101 of the USB PCB are
faulty.
Check the USB device being used
NO
YES
Checking the unit
YES
YES
YES
Do not use a USB hub.
This unit supports devices in the FAT16-
NO
and FAT32-formatted mass storage class,
MTP-compatible devices and iPod devices
(except for some models).
NO
Connect the connectors correctly.
NO
The circuit around IC854 of the DIGITAL PCB
is faulty.
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