W DOC AIRBUS | TSM A320F

Loss of the HF 1 Communication

TASK 23-11-00-810-803-A
Loss of the HF 1 Communication

1. Possible Causes
  • COUPLER-HF, 1 [4RE1]
  • XCVR-HF, 1 [3RE1]
  • wiring
  • ANTENNA [5RE]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 23-11-00-200-001
Check of the Electrical Bonding of the HF System
AMM 23-11-00-740-001
BITE Test of the HF System
ASM 231101
AMM 23-11-11-000-001
Removal of the High Frequency (HF) Antenna
AMM 23-11-11-400-001
Installation of the High Frequency (HF) Antenna
AMM 23-11-33-000-001
Removal of the HF Transceiver
AMM 23-11-33-400-001
Installation of the HF Transceiver
AMM 23-11-36-000-001
Removal of the HF Antenna Coupler
AMM 23-11-36-400-001
Installation of the HF Antenna Coupler
3. Fault Confirmation
Subtask 23-11-00-740-054-A
A. Test
   (1) Do the BITE test of the HF system AMM 23-11-00-740-001.
NOTE: Do this test for the HF 1 only.
4. Fault Isolation
Subtask 23-11-00-810-052-E ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message
HF1 (3RE1)/ COAX:
   (1) If the fault continues:
   (2) If the fault continues:
   (3) If the fault continues:
  • Do a check of the wiring from the HF 1 coupler (4RE1)
    . to the ground:
    4RE1 pins A/G, D
    . to the HF 1 transceiver (3RE1):
    * 4RE1 pins A/A, L to 3RE1 pins AC/9, 1
    * 4RE1 pins A/B, c to 3RE1 pins AB/4E, 4F
    * 4RE1 pin B to 3RE1 pin AB/C (coaxial) ASM 231101.
     (a) If there is no continuity:
  • Repair the related wiring.
     (b) If there is continuity:
  • Do a check and repair the wiring between the HF 1 coupler (4RE1) and the HF antenna (5RE) ASM 231101.
       1 If there is no continuity:
  • Repair the above wiring.
       2 If there is continuity:
Subtask 23-11-00-810-052-J ** ON A/C NOT FOR ALL
A. If the test confirms the fault:
CHECK HF-1 ANTENNA CIRCUIT
   (1) If the fault continues:
   (2) If the fault continues:
   (3) If the fault continues:
     (a) Do a check of the wiring : ASM 231101
  • From the HF 1 coupler (4RE1) and to the ground:
    . Pins A/G, D
  • From the HF 1 coupler (4RE1) and to the HF 1 transceiver (3RE1):
    . Pins A/A, L to 3RE1 pins AC/9, 1
    . Pins A/B, < C to 3RE1 pins AB/4E, 4F
    . Pin B to 3RE1 pin AB/C (coaxial).
     (b) If there is no continuity:
  • Repair the related wiring.
     (c) If there is continuity:
  • Do a check and repair the wiring between the HF 1 coupler (4RE1) and the HF antenna (5RE) ASM 231101.
       1 If there is no continuity:
  • Repair the above wiring.
       2 If there is continuity:
Subtask 23-11-00-740-055-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:25:35 UTC
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