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Troubleshooting
First, make sure that all cables are securely attached and seated
completely in their sockets.
Problem Possible Cause Action
Unit operates
erratically
Static electricity may
cause the unit to
operate erratically.
Disconnect the
appropriate USB cable
from the US221
A /
US421
A port, then
reconnect it.
Printer does not
appear in
configuration
utility.
Printer was not
installed correctly.
Re-install the printer; the
configuration utility will
now find the printer.
Monitor program
of a printer does
not respond / Print
error messages
are generated
The printer’s USB port
is configured for a PC;
the US221
A / US421A
is in Auto Switch
mode.
Disable the Auto Switch
function and operate the
US221
A / US421A
manually.
The Lock / Unlock
function does not
respond
The too rapid or
continuous
connecting /
disconnecting of a
USB connector from a
locked port can cause
the status of the lock
to be misread.
Disconnect all USB cables
from the US221
A /
US421
A, then reconnect
them.
Auto Switch print
function does not
respond.
OS printer settings not
sent / not set correctly.
Reboot your PC to re-
establish settings, or re-
install the Configuration
Utility. See Software
Operation, page 13.
Auto Switch
function for other
devices does not
release control
after application
closes.
OS failed to close the
application.
Manual close the
application in your OS.