1_ If the fault continues:
 - do a check and repair the wiring from HF 2 transceiver
 (3RE2) to AMU (1RN) of the SELCAL OUTPUT signal (from pins

 AB/3C, 3D to pins AA/5H, 5J) (Ref. ASM 23-11/01).
 B. Do the test given in Para. 3.

 **ON A/C ALL
 TASK 23-51-00-810-825
 Loss of the SELCAL Code by the VHF 1 System
 1. Possible Causes
_______________
 - XCVR-VHF, 1 (1RC1)

 - AMU (1RN)

 - wiring from VHF 1 transceiver (1RC1) 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.
____
 「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 237
 Aug 01/01R
 CES  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 1 system only:

 - replace the XCVR-VHF, 1 (1RC1) (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).
 1_ If the fault continues:
 - do a check and repair the wiring from VHF 1 transceiver
 (1RC1) to AMU (1RN) of the SELCAL OUTPUT signal (from pins

 AB/13A, 13B to pins AA/1H, 1J) (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 238
 Aug 01/01R
 CES  TASK 23-51-00-810-826

 Loss of the SELCAL Code by the VHF 2 System
 1. Possible Causes
_______________
 - XCVR-VHF, 2 (1RC2)

 - AMU (1RN)

 - wiring from VHF 2 transceiver (1RC2) 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 2 system only:

 - replace the XCVR-VHF, 2 (1RC2) (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 239
　
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