D-Link DP-300+ User Manual page 16

Contact your dealer for correction of any LED problems before
proceeding.
The actual component tests immediately follow the LED tests.
A normal (no fault) result is signaled by a series of three cycles
of sequential flashing of the three LEDs, followed by a
quiescent state with all three LEDs dark.
If the self-test routine traps any component error, then
following the LED tests the self-test will halt and the LED's 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.
LPT1
off
off
off
off
off
off
off
off
on/steady
on/steady
on/steady
on/steady
LED Name
LPT2
off on/steady
off flashing
on/steady
on/steady on/steady
on/steady flashing
flashing
flashing on/steady
flashing flashing
off
off on/steady
off flashing
on/steady
Component
COM
Flash ID error
off
LAN Controller error
LAN Memory error
off
Parallel-2 Controller error
EEPROM error
Flash Protected
off
Timer INT error
LAN IO Base error
off
Unpacking and Installation
Faulty
COM error
LPT2 error
LPT1 error
RAM error