DOC AIRBUS | TSM A320FLoss of the BUS 1 Data from the CFDIU to the HF 1
TASK 23-11-00-810-819-A
Loss of the BUS 1 Data from the CFDIU to the HF 1
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 23-11-00-865-053-A
Subtask 23-11-00-810-075-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:25:35 UTC
Loss of the BUS 1 Data from the CFDIU to the HF 1
1. Possible Causes
- XCVR-HF, 1 [3RE1]
- wiring
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 23-11-00-740-001 | BITE Test of the HF System |
| AMM 23-11-33-000-001 | Removal of the HF Transceiver |
| AMM 23-11-33-400-001 | Installation of the HF Transceiver |
| ASM 313202 |
Subtask 23-11-00-865-053-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 23-11-00-740-067-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | CFDS/CFDIU/SPLY | 2TW | J18 |
| 121VU | CFDS/CFDIU/BACK/UP | 8TW | J17 |
B. Test
Do the BITE test of the HF system AMM 23-11-00-740-001.
4. Fault IsolationDo the BITE test of the HF system AMM 23-11-00-740-001.
NOTE: Do this test for the HF 1 only.
Subtask 23-11-00-810-075-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message HF 1 NO DATA FROM CFDIU:
Subtask 23-11-00-810-075-C ** ON A/C NOT FOR ALL - replace the XCVR-HF, 1 [3RE1] AMM 23-11-33-000-001 and AMM 23-11-33-400-001.
- do a check and repair the wiring of the BUS 1 OUTPUT signal, from the HF 1 transceiver (3RE1) pins AB/4A, 4B to the first terminal block ASM 313202.
A. If the test gives the maintenance message CFDIU (1TW)/HF1 (3RE1):
Subtask 23-11-00-740-068-A - replace the XCVR-HF, 1 [3RE1] AMM 23-11-33-000-001 and AMM 23-11-33-400-001.
- do a check and repair the wiring of the BUS 1 OUTPUT signal (from the HF 1 transceiver (3RE1) pins AB/4A, 4B to the first terminal block) ASM 313202.
B. Do the test given in Para. 3.B.