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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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02/18/21

Message Overview:

Message Name:

NO L-CPE-1 BUS OUTPUT

Message Code:

B3-006463

Associated CAS:

None

Reporting LRU: CPE 1 AUDIO
System Description: 23-00-00
Schematic Diagram: 23-51-00
Wiring Diagram: 23-51-09
23-51-11

Message Description:

L-CPE-1 bus data absent at L-RIU.

Possible Causes:

  • Left Control Panel Electronics (CPE 1) (A167)
  • Left Radio Interface Unit (RIU 1) (A17)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Control Panel Electronic (CPE) AMM 23-51-09-000-801
Installation of the Control Panel Electronic (CPE) AMM 23-51-09-400-801
Removal of the Radio Interface Unit (RIU) AMM 23-51-21-000-801
Installation of the Radio Interface Unit (RIU) AMM 23-51-21-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Simultaneously reset L AUDIO PWR 1 Circuit Breaker CB1-B1, L AUDIO PWR 2 Circuit Breaker CB4-F4, RIU 1B/AURAL Circuit Breaker CB1-B4 and RIU 1A Circuit Breaker CB1-B5. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, do close out.

  2. Swap Left CPE (A167) with right CPE (A168). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace defective CPE.

  3. Swap Left RUI (A17) with right RUI (A18). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace defective RUI.

  4. Do wiring check between the Left CPE (A167) and left Radio Interface Unit (A17) for the following wires:

    From To Result
    Conn. A167P1 - 94 Conn. A17P2 - 29
    Conn. A167P1 - 95 Conn. A17P2 - 30

    1. If the check is satisfactory, go to next step.
    2. If the check is not satisfactory, repair defective wiring.

  5. Do close out.

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