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 a If there is no continuity:
_
 - repair the above wiring. b If there is continuity:
_
 - replace the circuit breaker 2RC1.
 (2) If the circuit breaker is open:
 - close it.
 (a) If it opens again:
 - replace the VHF 1 transceiver (Ref. AMM TASK 23-12-33-000-001) and (Ref. AMM TASK 23-12-33-400-001).
 1 If the fault continues:
_
 - do a check for a short-to-ground at the wiring between the VHF 1 transceiver pin AC/2 and the circuit breaker 2RC1 (Ref. ASM 23-12/01).
 a If there is a short-to-ground:
_
 - repair the related wiring b If there is no short-to-ground:
_
 - replace the C/B-COM/VHF/1 (2RC1).
 (b) If the circuit breaker stays closed and the fault continues:
 - replace the VHF 1 transceiver (Ref. AMM TASK 23-12-33-000-001) and (Ref. AMM TASK 23-12-33-400-001).
 C. 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 202
 Nov 01/99 CES

 TASK 23-12-00-810-802

 Failure of the VHF 2 Transceiver
 1. Possible Causes
_______________
 - XCVR-VHF, 2 (1RC2)

 - wiring

 - C/B-COM NAV/VHF/2 (2RC2)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 23-12-00-740-001 BITE 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) ASM 23-12/02
 3. Fault Confirmation
__________________
 A. Test Do the BITE test of the VHF system (Ref. AMM TASK 23-12-00-740-001).
 NOTE : Do this test for the VHF 2 only.
____
 4. Fault Isolation
_______________
 A. Table of the circuit breakers used in this procedure:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU COM NAV/VHF/2 2RC2 L04
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞23-12-00∞∞∞∞∞∞∞∞∞∞Page 203
 Feb 01/00R
 CES R **ON A/C 001-049, 051-099, 101-105, 151-199,

 B. If the test gives the maintenance message VHF2 (1RC2):
 - do a check of the circuit breaker (2RC2) status.
 (1) If the circuit breaker is closed:
 - do a check for 28DC at pin AC/2 of the VHF 2 transceiver (1RC2) (Ref. ASM 23-12/02).
 (a) If there is 28DAC:

 - replace the XCVR-VHF, 2 (1RC2), (Ref. AMM TASK 23-12-33-000-001) and (Ref. AMM TASK 23-12-33-400-001).

 (b) If there is no 28DAC:

 - do a check for a ground signal at pin AB/3D of the VHF 2 transceiver (1RC2) (Ref. ASM 23-12/02).
 1 If there is no ground signal:
_
 - repair the wiring between the VHF 2 transceiver pin AB/3D and the ground terminal (Ref. ASM 23-12/02).
 2 If there is a ground signal:
_
 - do a check of the wiring between the VHF 2 transceiver pin AC/2 and the circuit breaker 2RC2 (Ref. ASM 23-12/02).
 a If there is no continuity:
_ - repair the above wiring.
 b If there is continuity:
_
 - replace the circuit breaker 2RC2.
 (2) If the circuit breaker is open:
 - close it.
 (a) If it opens again:
 - replace the VHF 2 transceiver (Ref. AMM TASK 23-12-33-000-001) and (Ref. AMM TASK 23-12-33-400-001).
 1 If the fault continues:
_
 - do a check for a short-to-ground at the wiring between the VHF 2 transceiver pin AC/2 and the circuit breaker 2RC2 (Ref. ASM 23-12/02).
 a If there is a short-to-ground:
_ - repair the related wiring
 b If there is no short-to-ground:
_
 - replace the C/B-COM NAV/VHF/2 (2RC2).

 (b) If the circuit breaker stays closed and the fault continues:
 - replace the VHF 2 transceiver (Ref. AMM TASK 23-12-33-000-001) and (Ref. AMM TASK 23-12-33-400-001).
R **ON A/C 106-149, 201-299, 301-399, 401-499,
 B. If the test gives the maintenance message VHF2 TRANSCEIVER:
 - do a check of the circuit breaker (2RC2) status.
　
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