Failure of the HF 1 Transceiver

TASK 23-11-00-810-801-A
Failure of the HF 1 Transceiver

1. Possible Causes

XCVR-HF, 1 [3RE1]
wiring
[1RE1]

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 23-11-33-000-001	Removal of the HF Transceiver
AMM 23-11-33-400-001	Installation of the HF Transceiver

3. Fault Confirmation
Subtask 23-11-00-740-050-A

A. Test
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 23-11-00-865-055-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	COM HF1	1RE1	HA14

Subtask 23-11-00-810-050-A ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message HF 1 TRANSCEIVER:

Do a check of the circuit breaker (1RE1) status.

(1) If the circuit breaker is closed:

Do a check for 115VAC at pins AC/4, 5, 6 of the HF 1 transceiver (3RE1) ASM 231101.

(a) If there is 115VAC:

Replace the XCVR-HF, 1 [3RE1] , AMM 23-11-33-000-001 and AMM 23-11-33-400-001.

(b) If there is no 115VAC:

Do a check for a ground signal at pin AC/8 of the HF 1 transceiver (3RE1) ASM 231101.

1 If there is no ground signal:

Repair the wiring between the HF 1 transceiver (3RE1) pin AC/8 and the ground terminal ASM 231101.

2 If there is a ground signal:

Do a check of the wiring from the circuit breaker (1RE1) to the HF 1 transceiver (3RE1) pins AC/4, 5, 6 ASM 231101.

a If there is no continuity:

Repair the above wiring.

b If there is continuity:

Replace the circuit breaker (1RE1).

(2) If the circuit breaker is open:

Close it.

(a) If it opens again:

Replace the HF 1 transceiver (3RE1) AMM 23-11-33-000-001 and AMM 23-11-33-400-001.

1 If the fault continues:

Do a check for a short to ground at the wiring between the HF 1 transceiver (3RE1) pins AC/4, 5, 6 and the circuit breaker (1RE1) ASM 231101.

a If there is a short to ground:

Repair the related wiring.

b If there is no short to ground:

Replace the [1RE1] .

(b) If the circuit breaker stays closed and the fault continues:

Replace the HF 1 transceiver (3RE1) AMM 23-11-33-000-001 and AMM 23-11-33-400-001.

(3) If the fault continues:

Do a check of the electrical bonding of the HF system AMM 23-11-00-200-001.

Subtask 23-11-00-810-050-C ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message HF1 (3RE1):

Do a check of the circuit breaker (1RE1) status.