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A 737-300/400/500MAINTENANCE MANUAL
HANDSET AT AFT ATTENDANT'S PANEL
HANDSET AT FORWARD ATTENDANT'S PANEL
SERVICE INTERPHONE SWITCH
SEE A
AFT OVERHEAD PANEL, P5
LOAD CONTROL
CENTER, P6-2
EXTERNAL POWER RECEPTACLE PANEL
SEE B
SERVICE
INTERPHONE
OFF
ON
AUDIO ACCESSORY UNIT OR
REMOTE ELECTRONICS UNIT
EXTERNAL INTERPHONE
HANDSET JACK ON POWER
CONTROL STAND -
AFT FACE
CONN FLIGHT SERVICE
NOSE
PILOT WHEELWELL
ON
NORM
NOT CALL LIGHT
IN USE
SERVICE INTERPHONE SWITCHEXTERNAL POWER RECEPTACLE PANEL AB Service Interphone System Component Location Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
Switched Service Interphone Jacks Location
Figure 2
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
2. Audio Accessory Unit or Remote Electronic Unit
______________________________________________
A. On airplanes with digital control system, the audio accessory unit (AAU) card is installed in the remote electronics unit (REU) and is located on the E2-1 shelf. On airplanes without digital control system, the audio accessory unit (AAU) is also installed on E2-1 shelf. The AAU performs the same function as the AAU card in the REU.
B. The AAU provides the necessary dc voltage to the system microphones and amplifies the audio signal. Either carbon or transistorized microphones may be used. Automatic level control ensures a constant output regardless of the number of microphones connected to the system. Since the system has no on-off switch, it will operate whenever the battery bus or dc bus No. 2 has power. Gain controls for the service interphone system are on the audio control panel.
3. Service Interphone Switch
_________________________
A. The service interphone switch is located on the aft overhead panel P5. In the ON position, the switch connects the microphone lines from the external service interphone jacks to the input of the interphone amplifiers. The OFF position disconnects the microphone lines to isolate the external service interphone jacks during flight.
4. Handsets
________
A. The handset may be of the press-to-use or press-to-talk type. The button on a press-to-use type handset completes both microphone and receiver audio circuits when the handset button is pressed. The button on a press-to-talk type handset completes only the microphone circuits when it is pressed; receiver circuits are connected directly to the system.
B. The service interphone amplifier provides the necessary voltage for operation of carbon or transistorized handsets. Handset impedance is approximately 150 ohms.
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