1_ If the fault continues:
 - do a check and repair the wiring from VHF 2 transceiver
 (1RC2) to AMU (1RN) of the SELCAL OUTPUT signal (from pins

 AB/13B, 13A to pins AA/2H, 2J) (Ref. ASM 23-12/01).
 B. Do the test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞23-51-00∞∞∞∞∞∞∞∞∞∞Page 240
 Aug 01/01R
 CES

 TASK 23-51-00-810-827

 Loss of the SELCAL Code by the VHF 3 System
 1. Possible Causes
_______________
 - XCVR-VHF, 3 (1RC3)

 - AMU (1RN)

 - wiring from VHF 3 transceiver (1RC3) to AMU (1RN)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
23-51-00-810-828 Loss of the SELCAL Code
 AMM 23-12-33-000-001 Removal of the VHF Transceiver (1RC1, 1RC2, 1RC3)
 AMM 23-12-33-400-001 Installation of the VHF Transceiver (1RC1, 1RC2,

 1RC3) 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 23-12/01
 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 (if installed) and VHF system.
____
 4. Fault Isolation
_______________
 A. If the ground station cannot make a SELCAL call:
 (1) During the operational test of each HF (if installed) and VHF system:

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

 (2) During the operational test of the VHF 3 system only:

 - replace the XCVR-VHF, 3 (1RC3) (Ref. AMM TASK 23-12-33-000-001) and (Ref. AMM TASK 23-12-33-400-001).
 (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).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞23-51-00∞∞∞∞∞∞∞∞∞∞Page 241
 Aug 01/01R CES

 1_ If the fault continues:
 - do a check and repair the wiring from VHF 3 transceiver
 (1RC3) to AMU (1RN) of the SELCAL OUTPUT signal (from pins

 AB/13A, 13B to pins AA/3H, 3J) (Ref. ASM 23-12/01).
 B. Do the test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞23-51-00∞∞∞∞∞∞∞∞∞∞Page 242
 Aug 01/01R
 CES

 TASK 23-51-00-810-828

 Loss of the SELCAL Code
 1. Possible Causes
_______________
 - AMU (1RN)

 - SELCAL CODE PNL (3RN)

 - wiring from the SELCAL CODE PANEL (3RN) to the AMU (1RN)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 23-51-00-710-002 Operational Test of the SELCAL System
 AMM 23-51-13-000-001 Removal of the SELCAL Code Panel (3RN)
 AMM 23-51-13-400-001 Installation of the SELCAL Code Panel (3RN)
 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 23-51/06

 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 (if installed) and VHF system.
____
 4. Fault Isolation
_______________
 A. If the ground station cannot make a SELCAL call during the operational test of each HF (if installed) and VHF system:
 - make sure that the code of the SELCAL CODE PANEL (3RN) is the same as the code transmitted to the ground station.
 (1) 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).
 (a) If the fault continues:
　
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