3 Other functions
_
-Pin-program The calculating unit collects the information given by the pin-program. It processes this information then sends it: .to the various audio cards and then to the ACPs. .to the BITE circuit to enable this circuit to generate a data message which is sent to the CFDIU system.
-BITE circuit The BITE system sends a test request message to the SELCAL-CALL card via the input stages. A test unit comprised of an LF-signal generator circuit, output status-check circuits and input forcing circuits is integrated into this card. The calculating unit processes the messages then triggers the test program. The result is sent in message form to the BITE circuit.
**ON A/C ALL
G. Pin-Program
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
(Ref. Fig. 036)
R **ON A/C 106-149, 221-299, 301-399, 401-499,
(Ref. Fig. 036A)
**ON A/C ALL
In a simple way, the pin-program adapts the AMU to suit the various
configurations of the audio system.
The pin-programm:
-Inhibits the function selection annunciators located on the face of the ACP which correspond to the uninstalled optional equipment (VHF3, HF1, HF2)
1EFF : ALL 1 23-51-00Page 96 1 1 Aug 01/05 1 1 1CES 1
Pin-Program - Block Diagram
Figure 036
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 23-51-00Page 97 1201-220, 1May 01/05 1 1 1CES 1
Pin-Program - Block Diagram
Figure 036A
R 1EFF : 106-149, 221-299, 301-399, 401-499, 1 23-51-00Page 98 1 1 Aug 01/05 1 1 1CES 1
-Sends, after processing in the AMU, installation information relevant to the previous equipment and information relevant to the optional navigation equipment (ADF2 - MLS). It sends this information to the CFDIU via an output bus.
-Inhibits the automatic reset function after the Cabin Attendant and ground crew calls have operated for 60 seconds.
-
Enables change from FAA certification to CAA certification.
-
Enables the PA transmission pushbutton switch located on each ACP to be given stable operation (i.e. same as the other transmission pushbutton switches).
Operation It is possible to modify the programming of these functions by installing specific shunts. This generates a message which (after it has been processed) is sent to the various ACPs, to the CFDIU or to the management microprocessor.
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
H. Electrical Power Supply
(Ref. Fig. 037)
Seven separate power-supply networks supply the AMU:
-
One +28 V input for each processing channel (5 in maximum configuration)
-
One +28 V input which supplies the flight interphone function.
-
One +28 V input which supplies the SELCAL-CALL and BITE function. Each network is equipped with its own protection, filter and regulation systems.
R **ON A/C 106-149, 221-299, 301-399, 401-499,
J. Additional cockpit occupant function (optional) On AMU 4031SB, all the audio circuits and interfaces for the optional 5th Occupant (located in cockpit) are implemented on the BITE board :
-power supply interface
-microphone supply interface
-selection and input of audio signals from the 5th Occupant microphones
-digital to analog conversion of reception signals
-amplification and impedance matching of audio output interface
-radio PTT selection interface
-discrete interface
-ARINC 429 interface with the 5th Occupant ACP
NOTE : For the other crew members, these circuits and interfaces are
____ located on the audio boards and adaptation board.
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Electrical Power Supplies of the AMU - Block Diagram
Figure 037
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 23-51-00Page A0 1201-220, 1May 01/05 1 1 1CES 1 **ON A/C ALL
7. BITE Test
_________
R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
A. Purpose The audio system BITE (Built-In Test Equipment) serves as an aid for line maintenance in workshop and Service Department. It is used when faulty units are to be detected, replaced or repaired. It limits the number of unwanted removals of the system components. The BITE:
-Constantly transmits the actual status of the system
(availability-unavailability).
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