Loss of the BUS 4 Data from the CFDIU to the VHF 3
1. Possible Causes
_______________
- XCVR-VHF, 3 (1RC3)
- wiring
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 31-32/05
3. Fault Confirmation
__________________
A. Make sure that this(these) circuit breaker(s) is(are) closed: -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
121VU CFDS/CFDIU/SPLY 2TW J18 **ON A/C ALL Post SB 31-1163 For A/C 155-156,208-209,
121VU CFDS/CFDIU/BACK/UP 8TW J17 **ON A/C ALL
B. Test Do the BITE test of the VHF system (Ref. AMM TASK 23-12-00-740-001).
NOTE : Do this test for the VHF 3 only.
____
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞23-12-00∞∞∞∞∞∞∞∞∞∞Page 233
May 01/05R
CES
4. Fault Isolation
_______________
**ON A/C 001-049, 051-061, 101-105,
A. If the test gives the maintenance message VHF3 : NO DATA FROM CFDIU:
- replace the XCVR-VHF, 3 (1RC3) (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 and repair the wiring of the BUS 4 OUTPUT signal, (from VHF 3 transceiver (1RC3) pins AB/6A, 6B to the first terminal block)(Ref. ASM 31-32/05).
R **ON A/C 062-099, 106-149, 151-199, 201-299, 301-399, 401-499,
A. If the test gives the maintenance message CFDIU (1TW)/VHF3 (1RC3):
- replace the XCVR-VHF, 3 (1RC3) (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 and repair the wiring of the BUS 4 OUTPUT signal, (from VHF 3 transceiver (1RC3) pins AB/6A, 6B to the first terminal block)(Ref. ASM 31-32/05).
**ON A/C ALL
B. Do the test given in Para. 3.B.
R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-214,
TASK 23-12-00-810-822
Unwanted Background Noise on VHF1
1. Possible Causes
_______________
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
23-12-00-810-814 Loss of the VHF 1 Reception
3. Fault Confirmation
__________________
A. Test
Not applicable.
4. Fault Isolation
_______________
A. If the crew observation VHF1 - Background Noise on VHF1, with frequency
135.97 Mhz identifies the fault symptom:
- select the local ATIS frequency on VHF1.
(1) If no background noise is heard:
- no further action is necessary.
(2) If background noise is heard:
- do the fault isolation procedure (Ref. TASK 23-12-00-810-814).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-105, 151-199, ∞∞23-12-00∞∞∞∞∞∞∞∞∞∞Page 235
201-214, May 01/05 CES
**ON A/C 001-049, 101-105, 151-199,
TASK 23-12-00-810-823
Failure of the ANTENNA/VHF1 coaxial connection
1. Possible Causes
_______________
- XCVR-VHF, 1 (1RC1)
- ANTENNA-VHF, 1 (4RC1)
- coaxial from the VHF 1transceiver (1RC1) to the VHF 1 antenna (4RC1)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R ESPM 204416W01 AMM 23-12-00-710-001 Operational Test of the VHF System AMM 23-12-11-000-001 Removal of the VHF Antennas (4RC1) and (4RC2) AMM 23-12-11-400-001 Installation of the VHF Antennas (4RC1) and (4RC2) 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,
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