PIDU Ethernet LED did not blink 10 times

If the PIDU Ethernet LED does not blink 10 times it means that there is an overloaded or short circuit in the power supply to the LPU and ODU.

Action:
1. Remove the ODU cable from the PIDU. Examine it for signs of damage. Check that the ODU cable resistances are correct, as specified in Test resistance in the ODU cable on page 8-8. If the ODU cable is suspect, replace it.


2. Remove the LAN cable from the PIDU. Examine it for signs of damage. If the LAN cable is suspect, replace it.


3. Use the LPU (if installed) to check that power is available on the cable to the ODU. Access the connections by rotating the LPU lid.Slacken the lid nut but do not remove it.


4. Test that test point P1 on the LPU PCB corresponds to pin 1 on the RJ45. Repeat for points P2 to P8. This test is only valid if both the PIDU and the ODU are disconnected.


5. Reconnect the ODU cable to the PIDU.


6. Check that the PWR LED near the top right of the LPU PCB is illuminated to indicate power in the Ethernet cable.


7. If any test fails, replace or repair the cable that connects the PIDU to the LPU or ODU.