757 MAINTENANCE MANUAL
 O. Put the Airplane Back to Its Usual Condition
 S 865-099
 (1)
Put the audio selector panels back to the usual condition.

 S 865-100

 (2)
Put all of the handsets back on the hook.

 S 085-101

 (3)
Remove the test equipment:

 (a)
The random noise generator

 (b)
The sound level meter

 (c)
The test tapes.

 S 865-172
 (4)
Turn the MUSIC control to OFF at the forward attendant panel, P21.

 S 415-121

 (5)
Close the access door, 119BL (AMM 06-41-00/201).

 (6)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 865-104
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757 MAINTENANCE MANUAL
 PASSENGER ADDRESS SYSTEM - INSPECTION/CHECK
___________________________________________
 1.  General_______
 A.  This subject has one task. The task is a test of the passenger address speakers and of the PA override function. Use two persons to do this task. One person listens to the speakers in the passenger compartment. The other person operates the PA system from the flight compartment.
 TASK 23-31-00-716-001
 2.  Test - Passenger Address Speakers and PA Override_________________________________________________
 A.  References
 (1)  
AMM 23-31-06/201, Boarding Music Tape Reproducer

 (2)  
AMM 23-51-00/501, Flight Interphone

 (3)  
AMM 24-22-00/201, Electrical Power - Control

 B.  Access
 (1)  Location Zones
 200 Upper Half of Fuselage

 C.  Prepare for the Test
 S 866-002
 (1)  Supply electrical power (AMM 24-22-00/201).
 D.  PA Speakers Test
 S 866-003
 (1)  
Turn the MUSIC control on at the P21 forward attendant panel, and adjust the music level.

 S 756-008

 (2)
Make sure you hear the boarding music from all PA speakers.

 E.  Handset and Speaker Mute Function test
 S 756-009
 (1)  Do these steps with each attendant handset:
 (a)  
Lift the handset off the hook, and push the PA switch.

 (b)  
Push the PTT switch.

 1)  Make sure the boarding music stops, while you push the switch.

 (c)  
Speak into the handset microphone. 1) Make sure you hear a clear voice from all PA speakers. 2) Make sure no sound comes from the speaker near the handset.

 (d)  
Put the handset back on the hook. 1) Make sure you hear the boarding music again.

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757 MAINTENANCE MANUAL
 F.  Microphones and Override Functions Test
 S 756-010
 (1) Do these steps at each audio selector panel (ASP) (AMM 23-51-00):
 (a)  
Push the MIC SELECTOR switch labeled PA.

 (b)  
Set the BOOM/OXY toggle switch to BOOM.

 (c)  
Use the boom microphone in the headset to speak through the PA speakers. 1) Make sure the boarding music stops. 2) Make sure you hear a clear voice in the passenger cabin.

 (d)  
Do these steps to do a test of the override function. 1) Use any attendant handset to speak through the PA speakers. 2) At the same time, use the boom microphone to speak through

 the PA speakers from the flight compartment.
 a)  Make sure the sound from the attendant handset stops, while the voice from the flight compartment comes through the PA speakers.
 (e)  
Set the BOOM/OXY toggle switch to OXY.

 (f)  
Use the oxygen mask microphone to speak through the PA speakers. 1) Make sure the boarding music stops. 2) Make sure you hear a clear voice in the passenger cabin.
　
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