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 23-42-00
 ALL  ú ú 07 Page 505 ú Dec 20/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
 AUDIO ACCESSORY UNIT - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  The audio accessory unit, M108, is on rack E4-3 in the main equipment center.
 B.  This procedure contains two tasks. The first task removes the audio accessory unit. The second task installs the audio accessory unit and does a test of the installation.
 TASK 23-42-01-004-001
 2.  Remove the Audio Accessory Unit_______________________________
 A.  References
 (1)  AMM 20-10-01/401, E/E Rack Mounted Components
 B.  Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 211/212 Flight Compartment

 (2)  
Access Panel
 119BL Main Equipment Center

 C.  Remove the Audio Accessory Unit
 S 864-002
 (1)  Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
 (a)  
11C22, PASS ADRS AMPL

 (b)  
11C23, INTERPHONE CABIN SERVICE

 (c)  
11C25, INTERPHONE CAPT FLT AMPL or 11C25, INTERPHONE FLT AMPL ASP 1 DUAL PWR

 (d)  
11C26, INTERPHONE F/O OBS or 11C26, INTERPHONE FLT AMPL ASP 2 DUAL PWR

 (e)  
11G29, INTERPHONE CAPT FLT AMPL or 11G29, INTERPHONE FLT AMPL ASP 1 R PWR

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757 MAINTENANCE MANUAL
 (f)  11G30, INTERPHONE F/O OBS
 or
 INTERPHONE FLT AMPL ASP 1 R PWR

 S 024-005
 (2)  Remove the audio accessory unit (AMM 20-10-01/401).
 TASK 23-42-01-404-006
 3.  Install the Audio Accessory Unit________________________________
 A. References
 (1)  
AMM 20-10-01/401, E/E Rack Mounted Components

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 B. Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 211/212 Flight Compatment
 221/222 Passenger Cabin - Section 41

 (2)  
Access Panel
 119BL Main Equipment Center

 C. Install the Audio Accessory Unit
 S 424-007
 (1)  
Install the audio accessory unit (AMM 20-10-01/401).

 S 864-008

 (2)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:

 (a)  
11C22, PASS ADRS AMPL

 (b)  
11C23, INTERPHONE CABIN SERVICE

 (c)  
11C25, INTERPHONE CAPT FLT AMPL or 11C25, INTERPHONE FLT AMPL ASP 2 DUAL PWR

 (d)  
11C26, INTERPHONE F/O OBS or 11C26, INTERPHONE FLT AMPL ASP 2 DUAL PWR

 (e)  
11G29, INTERPHONE CAPT FLT AMPL or 11G29, INTERPHONE FLT AMPL ASP 1 R PWR

 (f)  
11G30, INTERPHONE F/O OBS or 11G30, INTERPHONE FLT AMPL ASP 2 R PWR

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757 MAINTENANCE MANUAL
 D. The Test of the Audio Accessory Unit
 S 864-011
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-013

 (2)  
Push the PILOT switch on the forward attendant handset.

 S 714-014

 (3)  
Make sure the light in the FWD switch on the pilots' call panel, P5, comes on.
　
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