Gefen EXT-USB-400FON user manual Troubleshooting the USB 400 FO Extender

TROUBLESHOOTING THE USB 400 FO EXTENDER

PROBLEM	CAUSE	SOLUTION
USB 400 FO units were	The Receiver unit is	1. Recover/Resume the
working, but the Host	in suspend mode. The	operating system from
LED on Sender/Receiver	operating system may	Suspend/Standby mode
units are suddenly	put the USB 400 FO in	(see your operating
blinking	suspend mode when
		system’s documentation).
	computer is put into
		2. Attach a USB device to
	Suspend/Standby state
		the USB 400 FO.
	or when no USB devices
	are attached.
All LEDs on both the	The USB device is	1. Disconnect the
Sender unit and Receiver	malfunctioning.	USB-400FO from the
unit are on but the USB	The computer does	computer.
device does not operate		2. Connect the USB
correctly, or is detected	not recognize the USB
		device directly to the USB
as an “Unknown Device”	device.
		port on the computer.
in the operating system.
	The application software	3. If the device does not
	for the device is not	operate properly, consult
	operating.	the user documentation
		for the device.
		4. Update your system
		BIOS, chipset, or USB
		Host controller drivers
		from your System/Mother
		board manufacturer’s
		website.
		5. If device operates
		properly when directly
		connected to computer,
		connect another device
		to the USB 400 FO.
		Connect the USB
		400 FO to computer.
		6. If the second device
		does not operate, the
		USB 400 FO may
		be malfunctioning.
		Contact technical
		support for assistance.
		7. If the second device
		does operate properly,
		the first device may not
		be compatible with the
		USB 400 FO.

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