- do a check of continuity between pin AA/12J and pin AA/12K of the AMU (1RN) (Ref. ASM 23-51/03).
 (a) If there is continuity between the two pins:
 - replace the SW-RAD PTT, F/O (12RN) (Ref. AMM TASK 27-92-41-000-001) and (Ref. AMM TASK 27-92-41-400-001).
 1 If the fault continues:
_
 - replace the AMU (Ref. AMM TASK 23-51-34-000-001) and (Ref. AMM TASK 23-51-34-400-001).
 2 If the fault continues:
_
 - do a check and repair the wiring between AMU (1RN) pins AA/12J, 12K and pins 1, 2 of the radio PTT switch (12RN) (Ref. ASM 23-51/03).
 (b) If there is no continuity between the two pins:
 - replace the AMU (Ref. AMM TASK 23-51-34-000-001) and (Ref. AMM TASK 23-51-34-400-001).
 1 If the fault continues:
_
 - replace the ACP-F/O (2RN2) (Ref. AMM TASK 23-51-12-000-001) and (Ref. AMM TASK 23-51-12-400-001).
 2 If the fault continues:
_
 - connect a new hand microphone to the First Officer hand microphone receptacle (19RN2) on the panel 16VU.
 3 If the fault continues:
_
 - replace the RCPT-HAND MIC, F/O (19RN2) (Ref. IPC 235108).
 4 If the fault continues:
_
 - do a check and repair the wiring (between AMU (1RN) pins AA/13F, 13G and pins 1 and 2 of the First Officer hand microphone receptacle (19RN2)) (Ref. ASM 23-51/03).
 「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 ∞∞23-12-00∞∞∞∞∞∞∞∞∞∞Page 221
 May 01/01R
 CES  (3) If the fault is at the Third Occupant station:

 - replace the AMU (Ref. AMM TASK 23-51-34-000-001) and (Ref. AMM TASK 23-51-34-400-001).
 (a) If the fault continues:

 - replace the ACP-3RD OCCPNT (2RN3) (Ref. AMM TASK 23-51-12-000-001) and (Ref. AMM TASK 23-51-12-400-001).

 (b) If the fault continues:

 - connect a new hand microphone to the Third Occupant hand microphone receptacle (19RN3) on the panel 62VU.

 (c) If the fault continues:

 - replace the RCPT-HAND MIC, F/O (19RN3) (Ref. IPC 235108).

 (d) If the fault continues:

 - do a check and repair the wiring (between AMU (1RN) pins AA/1F, 1G and pins 1 and 2 of the Third Occupant hand microphone receptacle (19RN3)) (Ref. ASM 23-51/04).
 E. 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 ∞∞23-12-00∞∞∞∞∞∞∞∞∞∞Page 222
 May 01/01R
 CES

 TASK 23-12-00-810-813

 Loss of the VHF 1 Transmission
 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
 -------------------------------------------------------------------------------
AMM 23-12-00-710-001 Operational Test of the VHF System
 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 23-51-34-000-001 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 VHF system (Ref. AMM TASK 23-12-00-710-001).
 NOTE : Do this test for the VHF 1 system only.
____
 4. Fault Isolation
_______________
 A. If the transmission function is not possible during the operational test of the VHF 1 system:
 - replace the XCVR-VHF, 1 (1RC1) (Ref. AMM TASK 23-12-33-000-001) and (Ref. AMM TASK 23-12-33-400-001).
 (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:
 - do a check and repair the wiring from VHF 1 transceiver (1RC1) to AMU (1RN) of the MIKE INPUT signal, from pins AB/1A, 1B to pins AA/1E, 1D (Ref. ASM 23-51/06).
 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 ∞∞23-12-00∞∞∞∞∞∞∞∞∞∞Page 223
 May 01/01R CES

 TASK 23-12-00-810-814
　
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