02/18/21
Message Overview:
Message Description:
L-CPE-2 bus data absent at R-RIU.
Possible Causes:
- Left Control Panel Electronics (CPE 1) (A167)
- Right Radio Interface Unit (RIU 2) (A18)
- 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 |
| Wiring - Maintenance Practices - ALL | SPM 20-12-00-02 |
| Wire Repair - Maintenance Practices - ALL | SPM 20-12-10-02 |
| Electrical Connectors - Maintenance Practice - ALL | SPM 20-20-00-02 |
Troubleshooting Recommendations:
- Simultaneously reset L AUDIO PWR 1 Circuit Breaker CB1-B1, L AUDIO PWR 2 Circuit Breaker CB4-F4, RIU 2B/AURAL Circuit Breaker CB2-B5 and RIU 2A Circuit Breaker CB2-B4. Is the fault message still present?
- If YES, continue with next step.
- If NO, do close out.
- Swap left CPE (A167) with right CPE (A168). Is the fault message still present?
- If YES, continue with next step.
- If NO, replace defective CPE.
- Swap right RUI (A18) with left RUI (A17). Is the fault message still present?
- If YES, continue with next step.
- If NO, replace defective RUI.
- Do wiring check between the left CPE (A167) and right Radio Interface Unit (A18) for the following wires:
From To Result Conn. A167P1 - 96 Conn. A18P1 - 29 Conn. A167P1 - 97 Conn. A18P1 - 30 - If the check is satisfactory, go to next step.
- If the check is not satisfactory, repair defective wiring.
- Do close out.