No Tuning of the HF 1 Coupler

TASK 23-11-00-810-813-A
No Tuning of the HF 1 Coupler

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-11-00-710-001	Operational Test of the HF System
ASM 231101
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 23-11-00-710-055-A

A. Test
Do the operational test of the HF system AMM 23-11-00-710-001.

NOTE: Do this test for the HF 1 system only.

4. Fault Isolation
Subtask 23-11-00-810-069-A

A. If the 1000 Hz audio signal continues after 15 seconds transmission:

(1) If the fault continues:

(a) If the fault continues:

do a check of the wiring of the KEY LINE signal (from HF 1 coupler (4RE1) pin A/K to the first terminal block) ASM 231101.

1 If there is no continuity:

2 If there is continuity:

do a check and repair the wiring from HF 1 coupler (4RE1) pins A/F, H, S to HF 1 transceiver (3RE1) pins AB/5B, 5C, 5H ASM 231101.

Subtask 23-11-00-710-056-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:35 UTC