R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,

 TASK 23-51-00-810-823
 Loss of the SELCAL Code by the HF 1 System
 1. Possible Causes
_______________
 - XCVR-HF, 1 (3RE1)

 - AMU (1RN)

 - wiring from HF 1 transceiver (3RE1) to AMU (1RN)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
23-51-00-810-828 Loss of the SELCAL Code
 AMM 23-11-33-000-001 Removal of the HF Transceiver (3RE1, 3RE2)
 AMM 23-11-33-400-001 Installation of the HF Transceiver (3RE1, 3RE2)
 AMM 23-51-00-710-002 Operational Test of the SELCAL System
 AMM 23-51-34-000-001 Removal of the Audio Management Unit (AMU) (1RN)
 AMM 23-51-34-400-001 Installation of the Audio Management Unit (AMU) (1RN)
 ASM 23-11/01

 3. Fault Confirmation

__________________
 A. Test
 (1) Do the operational test of the SELCAL system (Ref. AMM TASK 23-51-00-710-002).
 NOTE : Do this test for each HF and VHF system.
____
 4. Fault Isolation
_______________
 A. If the ground station cannot make a SELCAL call:
 (1) During the operational test of each HF and VHF system:

 - do the fault isolation procedure (Ref. TASK 23-51-00-810-828).

 (2) During the operational test of the HF 1 system only:

 - replace the XCVR-HF, 1 (3RE1) (Ref. AMM TASK 23-11-33-000-001) and (Ref. AMM TASK 23-11-33-400-001).
 (a) If the fault continues:
 - replace the AMU (1RN) (Ref. AMM TASK 23-51-34-000-001) and (Ref. AMM TASK 23-51-34-400-001).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 106-149, 201-299, 301-399, ∞∞23-51-00∞∞∞∞∞∞∞∞∞∞Page 233
 401-499, Aug 01/05 CES

 1_ If the fault continues:
 - do a check and repair the wiring from HF 1 transceiver
 (3RE1) to AMU (1RN) of the SELCAL OUTPUT signal (from pins

 AB/3D, 3C to pins AA/4H, 4J) (Ref. ASM 23-11/01).
 B. Do the test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 106-149, 201-299, 301-399, ∞∞23-51-00∞∞∞∞∞∞∞∞∞∞Page 234
 401-499, Aug 01/05 CES

R **ON A/C 051-099, 201-210, 301-399, 401-499,

 TASK 23-51-00-810-824
 Loss of the SELCAL Code by the HF 2 System
 1. Possible Causes
_______________
 - XCVR-HF, 2 (3RE2)

 - AMU (1RN)

 - wiring from HF 2 transceiver (3RE2) to AMU (1RN)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
23-51-00-810-828 Loss of the SELCAL Code
 AMM 23-11-33-000-001 Removal of the HF Transceiver (3RE1, 3RE2)
 AMM 23-11-33-400-001 Installation of the HF Transceiver (3RE1, 3RE2)
 AMM 23-51-00-710-002 Operational Test of the SELCAL System
 AMM 23-51-34-000-001 Removal of the Audio Management Unit (AMU) (1RN)
 AMM 23-51-34-400-001 Installation of the Audio Management Unit (AMU) (1RN)
 ASM 23-11/01

 3. Fault Confirmation

__________________
 A. Test
 (1) Do the operational test of the SELCAL system (Ref. AMM TASK 23-51-00-710-002).
 NOTE : Do this test for each HF and VHF system.
____
 4. Fault Isolation
_______________
 A. If the ground station cannot make a SELCAL call:
 (1) During the operational test of each HF and VHF system:

 - do the fault isolation procedure (Ref. TASK 23-51-00-810-828).

 (2) During the operational test of the HF 2 system only:

 - replace the XCVR-HF, 2 (3RE2) (Ref. AMM TASK 23-11-33-000-001) and (Ref. AMM TASK 23-11-33-400-001).
 (a) If the fault continues:
 - replace the AMU (1RN) (Ref. AMM TASK 23-51-34-000-001) and (Ref. AMM TASK 23-51-34-400-001).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 051-099, 201-210, 301-399, 401-499, ∞∞23-51-00∞∞∞∞∞∞∞∞∞∞Page 235
　
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