Fault Message:

DCPC SPDA DC BAT BUS FEEDER CARD A5

Fault Code:

2460405DCP

Associated CAS:

ELEC SYS FAIL
(Caution)

Voltage or trip status of any programmable Solid State Power Converter (SSPC) on the Feeder Card is detected not in commanded state. Detected at power-up or continuous Built-In Test (BIT).
DCPC SPDA DC BATT BUS FEEDER CARD A5

• DC Power Center (DCPC) (A63)
• DC Power Center (DCPC) Secondary-Power Distribution Assembly (SPDA) 1 (A13)
• DC BATT BUS Feeder Card
• Battery/Ram-Air Turbine Interface (BATT/RAT I/F) Card (p/o A20)
• Right Microprocessor Card (p/o A20)
• Associated Wiring

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

The following are the main functions of DCPC SPDA DC BATT Bus Feeder card:

• Provides for power switching and load protection for four SPDA feeders on DC BATT Bus
• Monitors SSPC status
• Monitors DC BATT bus voltage status
• Monitors fuse and diode status on DC BATT Bus (EM 4)

1. Access the Signboard menu on the EMS CDU as per AMM TASK 24-00-00-946-801. Press on the "TEST" button on EMS CDU. On the line "ASSEMBLY", make a selection of "DCPC". On the line " SWAP MICROPROCESSORS" make selection of swapping from one side to the other. Is the fault resolved?

   1. If YES, replace the now inactive microprocessor and do close out.
   2. If NO, continue with next step.

2. Swap SPDA DC BATT BUS FEEDER Card with SPDA DC BUS 1 FEEDER Card. Did the fault follow?

   1. If YES, replace SPDA DC BATT BUS FEEDER Card and do close out.
   2. If NO, continue with next step.

3. Verify the voltage references input of the SPDA DC BATT BUS FEEDER Card A5. Remove the SPDA DC BATT BUS FEEDER Card, the right Microprocessor and the BATT/RAT Interface CONNECTORS card from the DCPC. Perform a continuity check as follows:

   From	To	Result
   P431A-13/14	Ground
   P431C-13/14	Ground
   P431C-16	Ground

   1. If there is continuity, replace DCPC and do close out.
   2. If there is no continuity, continue with next step.

4. Perform a continuity check as follows:

   From	To	Result
   P431A-13/14	P410A/B/C-38/39
   P431C-13/14	P3A/B/C-38/39
   P431C-16	P410A-46

   1. If there is no continuity, replace DCPC and do close out.
   2. If there is continuity, continue with next step.

5. Swap the left Microprocessor with the right Microprocessor. Is the fault resolved?

   1. If YES, replace left Microprocessor and do close out.
   2. If NO, continue with next step.

6. Replace BATT/RAT I/F card.
7. Do close out.