11/10/23
Message Overview:
Message Name:
DLNA TO SDU RX ERROR
Message Code:
B3-661674
Associated CAS:
| Reporting LRU: | SAT 2X00 |
| System Description: | 23-00-00 - Communication |
| Schematic Diagram: | SSM 23-15-00-101 - Satellite Communication (SATCOM) SSM 23-15-00-102 - Satellite Communication (SATCOM) |
| Wiring Diagram: | WM 23-15-01-1_001 - Sheet 1 - SATCOM Satellite Data Unit (SDU) - 20501 TO 20960 WM 23-15-09-1_001 - Sheet 1 - SATCOM High Gain Antenna - 20501 TO 20960 |
Message Description:
Diplexer to Low Noise Amplifier (DLNA) to Satellite Data Unit (SDU) receiver error.
Possible Causes:
- Satellite Communications (SATCOM) Low-Noise Amplifier (LNA)/Diplexer (A83)
- Satellite Communications (SATCOM) Satellite Data Unit (SDU) (A82)
- RF cable
- Satellite Communications (SATCOM) High Gain Antenna (HGA) (E24)
- Associated Wiring
Troubleshooting Tips:
Advisory Wire/Service Bulletin:
- AW300-23-0419 - Satcom Data Unit (SDU-2200) Software Upgrade Available
Forum Articles/Infoservice/Newsletter: None
Quick Links:
| Removal of the Covers and Plugs | AMM 10-12-00-020-802 |
| Standard Aircraft Configuration for Maintenance | AMM 12-00-00-867-803 |
| Removal of the SATCOM Satellite Data Unit (SDU) | AMM 23-15-01-000-801 |
| Installation of the SATCOM Satellite Data Unit (SDU) | AMM 23-15-01-400-801 |
| Removal of the SATCOM High Gain Antenna (HGA) | AMM 23-15-09-000-801 |
| Installation of the SATCOM High Gain Antenna (HGA) | AMM 23-15-09-400-801 |
| Removal of the SATCOM Diplexer/LNA | AMM 23-15-13-000-801 |
| Installation of the SATCOM Diplexer/LNA | AMM 23-15-13-400-801 |
| Electrical/Electronic Safety Precautions | AMM 24-00-00-910-801 |
| Electrostatic-Discharge Safety Precautions | AMM 24-00-00-910-802 |
| Connect Electrical Power to the Aircraft | AMM 24-00-00-861-801 |
| Remove the Electrical Power from the Aircraft | AMM 24-00-00-861-802 |
| Data Download from the Maintenance Diagnostic Computer (MDC) | AMM 45-45-01-970-802 |
| 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:
- Reset SATCOM (CB4-D2) and SATCOM CONTROL (CB6-A2) circuit breakers.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Do wiring check of both RF cable from SDU connectors A82CP1/A82AP1 to Diplexer/LNA connectors A83P2/A83P3. Repair/replace as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Do wiring check of RF cable from HGA connector E24P2 to Diplexer/LNA connector A83P1. Repair/replace as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Confirm presence of 28 VDC and ground at Diplexer/LNA connector A83P4. Repair/replace as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Confirm presence of 28 VDC and ground at HGA connector E24P1. Repair/replace as required.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Replace Diplexer/LNA.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Replace SDU.
- If system checks are good, do close out.
- If fault remains, continue with next step.
- Replace HGA.
- Do close out.