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IC401A User Manual
Chapter 4: Troubleshooting
Table 4-1 (Continued). Problems/Causes/Solutions.
Problem Cause Solution
All LEDs on both
the LEX unit and
the REX unit are
on, but the USB
device does not
operate correctly or
is detected as an
“Unknown Device”
in the operating
system.
• The USB device is
malfunctioning.
• The computer does not
recognize the USB
device.
• The application software
for the device is not
operating.
• The extender is
malfunctioning.
1. Disconnect the extender from the computer.
2. Connect the USB device directly to the USB port on the
computer.
3. If the device does not operate properly, consult the user
documentation for the device.
4. Update your system BIOS, chipset, or USB Host
controller drivers from your system/motherboard
manufacturer’s Web site.
5. If the device operates properly when directly connected
to the computer, connect another device (of a different
type) to the extender to the computer.
6. If the second device does not operate, the extender may
be malfunctioning. Contact Black Box Technical Support
at 724-746-5500 or info@blackbox.com.
7. If the second device does not operate properly, the first
device may not be compatible with the extender.
USB device is
attached to the
REX USB port, but
the REX device LED
is off.
A USB device must have
the appropriate driver
installed on the computer
operating system.
1. Install the required USB device driver on the computer
operating system before attaching the USB device to the
REX unit. See your USB device manufacturer’s Web site
for details.
2. Consult your USB device documentation and power
your USB device with the additional (USB device
manufacturer supplied) power supply (if available).
Device LED is
orange and units
are no longer
functioning.
An overcurrent condition
has occurred because the
USB device draws more
power than can be
supplied per USB
specification (500 mA).
Power cycle the REX.
Host and Link LEDs
on the LEX/REX
units blink
intermittently.
Firmware mismatch
between the LEX and the
REX.
1. Use a different LEX/REX pair that has the same firmware
revision.
2. Upgrade the LEX/REX firmware. Contact Black Box
Technical Support at 724-746-5500 or
info@blackbox.com for assistance.