D-Link DP 301U, Manual, Page: 11 / 153

7
Power ON Self-Test
Every DP-301U has been factory-tested to operate properly.
When the DP-301U is powered ON, it also automatically performs a Self-Test on
each of its major components. The final result of the Self-Test is signaled by the
state of the USB LED indicator following the Self-Test. Preliminary to the actual
component tests, the three LED indicators are tested to confirm their steady and
flashing operation.
Immediately after power-up, all three of the green LEDs should illuminate steadily
for several seconds. Then the USB LED should light OFF. Irregularity of any of the
three LEDs during these LED tests may mean there is a problem with the LEDs
themselves.
The actual component tests immediately follow the LED tests. A normal (no fault)
result is signaled by a simultaneous flashing of the USB LED three times, followed
by a quiescent state with the USB LED dark.
If the Self-Test routine traps any component error, then following the LED tests the
Self-Test will halt and the USB LED will continuously signal the error according to
the following table. In the event of any such error signal, contact your dealer for
correction of the faulty unit.
USB LED Faulty Component
On DRAM error
1 long 3 short Flash Protected
1 long 5 short Flash Erase/Program error
1 long 6 short LAN Controller error
1 long 14 short LAN MII error