(1) Reset of the CFDIU NOTE : Open the circuit breakers for some seconds before you close
____
them.
(a) Open this(these) circuit breaker(s):
1 2TW
_
2 8TW
_
(b) Close this(these) circuit breaker(s):
1 2TW
_
2 8TW
_
(2) Do the BITE test of the CFDIU for the power up test result (Ref. AMM TASK 31-32-00-740-002).
4. Fault Isolation
_______________
A. If the fault symptom is identified by:
- no access to system BITEs from the MCDU
and
- power up test result not OK
(1) Make a record of the CFDS maintenance fault message.
(2) Do the trouble shooting procedure related to the CFDS fault message.
B. If the fault symptom is identified by:
- no access to system BITEs from the MCDU
and
- power up test result: TEST OK
(1) Check of the CFDIU and the electrical connector for correct condition.
(a) Remove the CFDIU (1TW) (Ref. AMM TASK 31-32-34-000-001).
Aug 01/05R CES
(b) Install a new CFDIU (1TW) (Ref. AMM TASK 31-32-34-400-001).
(2) If the fault continues:
(a) Use the Aircraft Schematic Manual (ASM) to find the number (1, 2, 3 or 4) of the CFDIU output bus related to the system BITEs which do not operate (each computer is linked to an output bus number).
(b) Do a check and repair the wiring from the related CFDIU output bus to the first terminal block (only bus 1, 2, 3 or 4):
1 For output bus 1, from connector AA/2B, 2C to the first
_ terminal block (Ref. ASM 31-32/02).
2 For output bus 2, from connector AB/2H, 2J to the first
_ terminal block (Ref. ASM 31-32/03).
3 For output bus 3, from connector AA/11F, 11G to the first
_ terminal block (Ref. ASM 31-32/04).
4 For output bus 4, from connector AB/11D, 11E to the first
_ terminal block (Ref. ASM 31-32/05).
(3) If the fault continues:
(a) Remove all the computers connected to the CFDIU output bus (1, 2, 3 or 4) related to the system BITEs which do not operate (each computer is linked to an output bus number)
NOTE : The list of computers related to each CFDIU output bus is
____ given in the Aircraft Schematic Manual (ASM).
(b) Check of the CFDIU output bus wiring and each computer on the output bus.
1 Do a check and repair the wiring for one computer on the
_ output bus (only bus 1, 2, 3 or 4):
NOTE : If the POST FLIGHT REPORT (PFR) gives a CFDS fault
____ message(s) of the type "NO DATA FROM CFDIU", first do a check of the line related to the computer which is the source of this maintenance message.
a For output bus 1, from connector AA/2B, 2C to the connector
_ of the computer (Ref. ASM 31-32/02).
b For output bus 2, from connector AB/2H, 2J to the connector
_ of the computer (Ref. ASM 31-32/03).
c For output bus 3, from connector AA/11F, 11G to the
_ connector of the computer (Ref. ASM 31-32/04).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞31-32-00∞∞∞∞∞∞∞∞∞∞Page A295
Aug 01/05R CES
d For output bus 4, from connector AB/11D, 11E to the
2 If the wiring to this computer is correct, install the
_
computer.
3 Do a check for access to the system BITE of this computer.
_ a If the access to the BITE is not possible
_ - replace the defective computer
- install all the other computers that you removed. b If the access to the BITE is possible
_
- do the same checks (output bus wiring and computer BITE) until you find the defective line or computer.
C. Test
(1) Make sure that all the system BITEs are available. NOTE : The list of computers related to each CFDIU output bus is
(2) Do the BITE test of the CFDIU (Ref. AMM TASK 31-32-00-740-002). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 指示和记录系统 1(58)
