04/07/21
Message Overview:
Message Description:
Configuration Strapping Unit (CSU) not properly strap for File Server Unit (FSU) 2. This troubleshooting is required if message is not displayed as expected.
Possible Causes:
- Configuration Strapping Unit 2 (CSU 2) (A4-CSU2)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin: None
Forum Articles/Infoservice/Newsletter: None
| System | LABEL | BIT or Code | Description |
|---|---|---|---|
| CSU | 360 (Word 13) | 14 | 1 = FSU 1 installed |
| CSU | 360 (Word 13) | 15 | 1 = FSU 2 installed |
Strapping for CSU 1 & 2 can be compared by simultaneously looking at CSU DATA (LEFT) and CSU DATA (RIGHT) on the MDC CONFIGURATION DATA page.
Quick Links:
| Operational Test of the Integrated-Avionics Processor System (IAPS) | AMM 31-45-00-710-801 |
| Removal of the Configuration Strapping Unit (CSU) | AMM 31-45-17-000-801 |
| Configuration Setting of the Configuration Strapping Unit (CSU) | AMM 31-45-17-280-801 |
| Installation of the Configuration Strapping Unit (CSU) | AMM 31-45-17-400-801 |
| 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:
- Check in the MDC in the current faults and fault history pages for problems related to CSU (ATA 22-12).
- If one of the listed fault is found, continue with the troubleshooting of this failure.
- If none of the listed faults is recorded in the MDC, continue with next step.
- Do the Configuration Setting of the Configuration Strapping Unit. Re-configure as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Replace CSU.
- Do close out.