R 1EFF : 106-149, 301-399, 401-499, 1 23-44-42Page 412 1 1 Aug 01/05 1 1 1CES 1R **ON A/C 106-149, 301-399, 401-499,
 4. Procedure
_________
 Subtask 23-44-42-420-050
 A. Installation of the Isolation Unit
 (1)
 If required, assemble the PC-board (2) to the PC-board bracket (6) and attach it with the nuts (4) and the washers (5).
 (2)
 Put the PC-board bracket (6) together with the PC-board (2) in position to the mounting rail (3).
 (3)
 Put the end-clamp (8) in position to the mounting rail (3) and tighten the clamp screw (7).
 (4)
 Safety the clamp screw (7) with lockwire, corrosion-resistant steel, dia 0.63mm on the PC-board (2).
 (5)
 Connect the wires of the cable harness (1) to the terminals of the PC-board (2).
 NOTE : For the correct connection refer to the table "Wire Connection
____ to Connector 4RJ" of the applicable illustration.
 (6) Make sure that the contacts, which are not used, are covered with red blanking plugs. 
R 1EFF : 106-149, 301-399, 401-499, 1 23-44-42Page 413 1 1 Aug 01/05 1 1 1CES 1
 Subtask 23-44-42-865-051 
 B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION ------------------------------------------------------------------------------- 
R  **ON A/C 106-149, 401-499, 
R  49VU COM/CIDS/DIR ESS/2 **ON A/C 106-149, 301-399, 401-499, 157RH  G02  
49VU COM DIR ESS/1 **ON A/C 301-399, 150RH  G01 
R  49VU COM DIR ESS/2 **ON A/C 106-149, 401-499, 157RH  G02  
121VU COM NAV/CIDS/DIR NORM/2 **ON A/C 301-399, 156RH  M06 
R  121VU COM NAV/CIDS/DIR NORM/2 121VU COM NAV/CIDS/DIR NORM/1 **ON A/C 106-149, 301-399, 401-499, 156RH 151RH  M07M06  
Subtask 23-44-42-710-050 
 C. Do the operational test of the service interphone (Ref. TASK 23-44-00-700-001). 
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 5. Close-up________ 
 Subtask 23-44-42-410-050 
 A. Close Access  
R  (1) FOR 4RJ1 
 (a) Close the access door 822.  
R  (2) FOR 4RJ2 
 (a) Close the access door 824 (Ref. TASK 52-41-00-410-002).  
R  (3) FOR 4RJ3, 4RJ4 
 (a) Install the partition 132PW at FR34 (Ref. TASK 25-54-12-400-001). 
 (b) Remove the actuator safety locks and close the FWD 
 cargo-compartment door. (Ref. TASK 52-30-00-860-002) 
 FOR 4RJ5 
 (c) Close the access door 312AR. 
 (4) Remove the access platform(s). 
R 1EFF : 106-149, 301-399, 401-499, 1 23-44-42Page 415 1 1 Aug 01/05 1 1 1CES 1 AUDIO MANAGEMENT (INTEGRATING/ FLIGHT INTERPHONE/SELCAL/CALL)
_____________________________________________________________ DESCRIPTION AND OPERATION
_________________________
 1. General
_______
 A. The audio management system provides the means for using:
 (1)
 All the radio communication and radio navigation facilities installed on the aircraft:
 -
In transmission mode: it collects the microphone inputs of the various crew stations and directs them to the communication systems.
 -
In reception mode : it collects the audio outputs of the communication systems and the navigation receivers and directs them to the various crew stations.
 (2)
 The flight interphone system:
 -
Telephone links between the various crew stations in the cockpit.
 -
Telephone links between the cockpit and the ground crew from the external power receptacle.
 (3)
 The SELCAL (Selective Calling) system:
-Visual and aural indication of calls from ground stations equipped with a coding device used by the aircraft installation.
 (4)
 Certain calls:
 -Visual and aural indication of the ground crew and the Cabin Attendants' calls.
 2. System Description
__________________
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
 (Ref. Fig. 001) 
R **ON A/C 106-149, 221-299, 301-399, 401-499,
 
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