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 intended for bench adjustments only.Interphone Speaker (Fig. 1)
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 A.  AIRPLANES WITHOUT DIGITAL AUDIO CONTROL SYSTEM; Cockpit speakers are installed in the flight compartment ceiling over the captain's and first officer's positions. Each speaker contains a loudspeaker, amplifier, muting circuits, and a volume control.
 B.  AIRPLANES WITH DIGITAL AUDIO CONTROL SYSTEM; Cockpit speakers are installed in the flight compartment ceiling over the captain's and first officer's seats. The internal speaker amplifier is contained in the REU. The volume control for each speaker is located on the audio selector panel for the corresponding pilot position.
 C.  The speakers receive audio signals from the audio selector panels (for airplanes without Digital Audio Control System) or from the REU (for airplanes with Digital Audio Control System). The speakers are muted whenever a PTT switch is pushed at the captain's or first officer's station for transmission using the boom microphone. There will be no speakers muting when the oxygen mask microphone is keyed.
Handheld Microphones (Fig. 2)
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 A.  The handheld microphones contain PTT switches which complete audio circuits and provide a ground for control circuits. The handheld microphone PTT switch, when pushed, connects the handheld microphone output to the system selected by the microphone selector switch. The handheld microphones are plugged into jacks at each flight crewmember's station.
Boom Microphones (Fig. 2)
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 A.  The boom microphones are part of a small headset with a microphone. The microphone is placed in front of the mouth by means of a boom connected to the headset. A control wheel or audio selector panel PTT switch must be pushed before transmission can take place. The boom microphone headset is plugged into jacks at each flight crewmember's station.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 8.  Oxygen Mask Microphones (Fig. 2)
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 A.  The oxygen mask has a microphone built into the mask. Each mask is equipped with an oxygen connection and a microphone plug. A control wheel or audio selector panel PTT switch must be pushed before transmission can take place. The mask microphone is plugged into jacks at each flight crewmember's station.
 9.  Control Wheel Push-To-Talk Switch
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 A.  The Push-To-Talk (PTT) switch on the control wheel provides PTT input form the boom or oxygen mask microphones.
 B.  The PTT switch is a three position switch on the outboard horn of the captain's and the first officer's control wheel. In the MIC position, microphone audio is directed to the selected communication system. In the INT position, microphone audio is connected directly to the flight interphone system without making microphone selection on the audio selector panel. The switch is spring loaded to the center "OFF" position.
 10. Operation (Fig. 3)
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 A.  General
 (1)  
AIRPLANES WITH DIGITAL AUDIO CONTROL SYSTEM; All audio inputs from the flight interphone system, service interphone system, radio communication systems, and radio navigation systems are connected directly to the remote electronics unit where they are processed into multiplex channels. The flight crew can then use their audio selector panels to select the multiplex channel they wish to hear on their headphones or headsets. They can also connect the PA channel to the passenger address amplifier.

 (2)  
AIRPLANES WITHOUT DIGITAL AUDIO CONTROL SYSTEM; All audio inputs from the flight interphone system, service interphone system, radio communication systems, and radio navigation systems are connected directly to the audio accessory unit where they are processed. The flight crew can then use their audio selector panels to select the channel they wish to hear on their headphones or headsets. They can also connect the PA channel to the passenger address amplifier.

 (3)  
AIRPLANES WITH DIGITAL AUDIO CONTROL SYSTEM; The flight interphone system hand held, boom, and oxygen mask microphones provide the microphone audio inputs from the flight crew to the remote electronics unit. The MIC SELECTOR switches on each audio selector panel determine which one of the communication or interphone systems will receive the microphone input for transmission. All audio selector panels functions are connected in parallel to the REU. The same communications are monitored by all flight crewmembers.
　
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