Power ON Self-Test
Every DP-311U has been factory-tested to operate properly.
When the DP-311U 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 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 flash ON three times. Irregularity of the LED during this LED test may mean there is a problem with the LED itself.
The actual component tests immediately follow the LED tests. A normal (no fault) result is signaled by a flashing of the USB LED, followed by a darkened LED.
If the Self-Test routine detects any component error, then following the LED tests the Self-Test will halt and the LEDs 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 |
| | |
low speed flashing | Need to reload firmware |
| |
steady ON | DRAM error |
1 long | 2 short | Timer INT error |
| | | |
1 long | 3 short | Flash Protected |
| | |
1 long | 5 short | Flash Erase/Program error |
| | | |
1 long | 6 short | LAN Controller error |
| | |
1 long | 7 short | LAN memory error |
| |
1 long 11 short | LAN I/O base error |
1 long 15 short | Wireless LAN card detect error |
| |
1 long 16 short | Wireless LAN card CIS error |
| |
1 long 17short | Wireless LAN card I/O error |
| |
1 long 18 short | USB error |
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