Airlink APSUSB1 - Manual (Page 11)

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7. Connect the DC end of the AC Power adapter to the DC power input
socket of the print server and the AC end to the wall outlet. This will
supply power to the print server, and the POST routines will proceed
automatically.
Note: This print server is built with a default IP setting. To prevent
from any conflict in your network, it is recommended to use the PS Admin
program to change the IP setting when there is some other device’s IP
address is the same as the print server’s default IP.
Power-up and Self-Test
Whenever the print server is powered up, two kinds of testing procedures
follow automatically. The first procedure is just a programmed series of LED
flashes, to confirm proper operation of the three LED indicators. The second
procedure comprises programmed tests of each of the print server's major
components.
LED Test Series
Immediately upon power-up, all three of the LED indicators will show steady
green/amber for a few seconds. Then the USB indicator will flash three times
while the Power LED remains steady. Irregularity of any of the LEDs during
this LED test series indicates that there is a problem with the LEDs
themselves. Contact your dealer for correction of any LED problems before
proceeding.
Component Test Series
The actual component tests immediately follow the LEDs test. If any error
condition is found during the component test series, then the test will halt
with the USB LED continuously signaling the particular error according to the
following table.