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 C.  The system gets power from the 28v dc battery bus, through a circuit
 breaker on overhead panel P11.Component Details (Fig. 1)
_________________
 A.  Audio Amplifier_______________
 (1)  Two identical audio amplifiers with parallel inputs are located in the audio accessory unit on shelf E4-3 in the main equipment center. The amplifiers are used by both the service interphone and the cabin interphone systems. A placard on the audio accessory unit identifies and locates the two amplifiers. There are two outputs from each amplifier. One output goes to the cabin interphone audio on the audio selector panels. The other output goes to the cabin interphone handsets and service interphone jacks. The amplifiers have internal adjustments preset for normal compression, squelch, and volume.
 B.  Service Interphone Switch_________________________
 (1)  The SERV INTPH switch is located on right sidewall panel P61. In the ON position, the switch connects the microphone lines from the service interphone jacks to the input of the interphone amplifiers. The OFF position disconnects the microphone lines to isolate the service interphone jacks during flight.
Operation (Fig. 2)
_________
 A.  Functional Description______________________
 (1)  
The INTERPHONE CABIN SERVICE circuit breaker on overhead panel P11 controls power to the system.

 (2)  
The SERV INTPH switch on panel P61 connects the mic lines from the phone jacks to the input of the interphone amplifiers. This switch activates the service interphone system. Then the interphone amplifiers distribute the amplified audio to the audio selector panels in the flight compartment, as well as to the cabin handsets, and to the audio line of the service interphone jacks located at convenient service locations. All microphone inputs from the handsets and from the audio selector panels mixes with that of the service interphone jacks onto a single-party system.

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A

757
MAINTENANCE MANUAL

FLIGHT RECORDER 
P11 PANEL  CONTROL PANEL 
SEE  A  AUDIO 
ACCESSORY 
UNIT 
(E4-3) 

P61 
PANEL 
FLIGHT COMPARTMENT 
FWD 
119BL 
FLT RCDR  SERV INTPH 
NORM ON  ON  MAIN EQUIPMENT CENTER 
OFF  OFF 
OFF 
w 
FLIGHT RECORDER CONTROL PANEL 
A  3 
5  8  2  7 
1 
6  4 
SERVICE INTERPHONE JACK LOCATIONS 
1. NOSE GEAR INTERPHONE PANEL (RIGHT SIDE), P62 
2. RIGHT MAIN WHEEL WELL SERVICE PANEL, P72 
3. RIGHT WING FUELING PANEL, P28 
4. APU COMPARTMENT PANEL 
5. MAIN EQUIPMENT CENTER 
6. HORIZONTAL STABILIZER PANEL 
7. AFT EQUIPMENT CENTER (STA 1351), P6-1 
8. E5 RACK  1  5  8  2  7  6  4 
SERVICE INTERPHONE JACK LOCATIONS 

Service Interphone System - Component Location
Figure 1

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A
757
MAINTENANCE MANUAL

E5 RACK
Service Interphone System Schematic
Figure 2

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A

757 MAINTENANCE MANUAL
 (3)  
The flight crew talks with the service interphone stations by pushing the MIC SELECTOR labeled CAB on the audio selector panels. This switch, along with the SERV INTPH switch on panel P61, connects a flight crew headset to the service interphone system. On the audio selector panel, the CAB switch is a push-on/push-off type and is lighted when on. The same knob also turns a volume control for that particular station.
　
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