SUPPLY 5V DC SERVICE INPH
OBS MICCIRCUITMIXINGFLIGHTFLT INTERPHONE SQUELCH COMPRESSOR
F/O MIC  INTER-PHONEP11 FWD
MIDSERVICEINPH AFTW
5V AC LTG RESET
COMPRESSOR
SQUELCH28V DC
ALERT A
D
MASTER DIMHOOK SWMAGNETICAND TEST
BB
FWD
OFF
HOOK
PTT

SENSOR
BBFWDMID28V DC
TONE
PILOTS
ENCODER

MID
CALLINTER-AFT
BB
AFT
TONEDECODER
FACE
PILOT

DATA BUS AA
PA
ALERT ALERT INTERFACE (TYPICAL)PA SYSTEM PILOTS CALL PANELHANDSET (TYPICAL)
CONT-ROLLER
P
FWD ATTENDP
CALL LIGHTATTEND-EMERG EXIT
ANTSCALLLCTR LT 2
P
INTER-28V DC
TO OTHER
FACEHANDSETS'
EMERG EXITINTERFACE
LCTR LT 3
P
EMERG EXITLCTR LT 4 PILOT CHIME
AURAL WARN CHIME
BELL/CHIME MODULEINTER-
PA HI/LO CHIMEFACE 28V DC
ATTENDANT ALERT
PASSENGERAUDIO ACCESSORY UNIT ADDRESS AMPL
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
Cabin Interphone System Schematic
Figure 2

A

757
MAINTENANCE MANUAL

 (4)  
Any attendant can call the pilot. Multiple calls by attendants to the pilot are possible. After a call, the attendant must put the handset back on the hook (cradle) or push the RESET switch to reset the unit. When the attendant at the called station removes the handset from the hook, a magnetic switch closes and connects the microphone to the system.

 (5)  
Any handset can be used to make an alert call. To make an alert call the attendant pushes the guarded ALERT call switch on the handset. The pilot can also make an alert call with the ALERT button on the call panel. When an alert call is made, it has priority over all other functions of the cabin interphone system.

 (6)  
For attendant stations, when an alert call occurs, stations with handset on the hook will receive a flashing pink attendant call light and three hi/lo chimes through the PA system. If the handset is off the hook, the station will receive the three hi/lo chimes only.

 (7)  
In the flight compartment, when a alert call occurs, the alert light on the pilots call panel comes on, and the high chime sounds once, regardless of the handset being on or off the hook.

 (8)  
The stations reset as they respond to the alert call by putting the handset back on the hook, or by pressing the RESET button on the handsets. The alert call is also reset when the caller's handset is put back on the hook. Alert calls placed from the pilots call panel cannot be reset.

 (9)  
When the pilot or attendant calls an attendant, the pink call light at the attendant station comes on. A hi/lo chime through the PA system is also heard. When the attendant at the called station removes the handset from the hook, the pink call light goes off and two-way communication is possible.

 (10)
 When an attendant calls the pilot, the blue attendant call light on the pilots' call panel comes on and a single hi chime is heard in the flight compartment.

 (11)
 The pilots' call panel permits the pilot to make a call to any attendant station. He pushes an attendant call switch (FWD, MID, or AFT) to connect the related attendant station and to signal the attendant to answer. The pilot must also push the CAB microphone-selector-switch on the audio selector panel to connect the microphone to the cabin interphone system. The pilot can then use the hand-held or the boom microphone to talk to the attendant stations.

 (12)
 On the pilots' call panel, the attendant call lights (FWD, MID, and AFT) come on when the attendants call the pilot. A call light does not come on while the pilot makes a call to its related station. The pilot's call to an attendant station cannot be reset from the call panel, the call can only be reset from the attendant station. The system makes it possible for the pilot to make multiple calls to the attendant stations. The pilot must push the attendant call switch again to make a new call.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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