(c)  
Make sure only these stations can speak between each other: 1) The control stand handset 2) The forward attendant's handset 3) The aft attendant's handset

 (d)  
Do the step before again but use the audio selector panel for the first officer.

 (e)  
Do the step before again but use the audio selector panel for the observer.

 (f)  
Set the service interphone ON-OFF switch on the overhead panel to OFF position.

 S 865-012
 (7)  Remove electrical power if it is not necessary (AMM 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 FLIGHT AND GROUND CREW CALL SYSTEM - DESCRIPTION AND OPERATION
______________________________________________________________
 1.  General (Fig. 1)_______
 A.  The flight and ground crew call system provides for call signals between the flight compartment and cabin attendant stations, between the flight compartment and ground personnel, and between cabin attendant stations. The system is used to signal personnel that they are wanted on the service interphone.
 B.  The system includes the ATTEND CALL and GRD CALL switches and the captain's call light on the forward pilots' overhead panel, the ATTENDANT, CAPTAIN and RESET switches on the attendant panels, and the PILOT CALL switch on the external power receptacle panel. It also includes the ground crew call horn, and the attendant call lights on the exit locator signs.
 C.  The call system gets power from the 28v dc bus No. 1 through the circuit breaker on the P18 load control center labeled PASS AND CREW CALL/LAV SMK DET (or PASS AND CREW CALL on airplanes without lavatory smoke detectors).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
CALL SWITCHES 
CALL SYSTEM 
EXIT 
LOCATOR SIGN 
SEE  E  CAPTAIN  ATTENDANT  RESET 
LIGHTS 
BRT  BRT  ON 
EXTERNAL  DIM  DIM 
POWER  OFF  OFF  NORM  r 
RECEPTACLE  ENTRY  WORK  EMER EXIT 
PANEL, P19  ATTENDANT'S AFT  AFT ATTENDANT'S PANEL 
SEE  C  PANEL 
SEE  A  A 

LIGHTS
BRT ON ON
DIM
FORWARD
OFF OFF OFF
ATTENDANT'S  ENTRY WORK GROUND
SERVICE
OFF DIM
PANEL
BRT NIGHT BRT
SEE B
DIM
EXIT
OFF
OVERHEAD
CEILING WINDOW
LOCATOR SIGNPANEL, P5
MUSIC SEE E
PILOTS' CALL CALL SWITCHES OFF SWITCHES
CALL SYSTEM SEE D
CAPTAIN ATTENDANT RESET
FORWARD ATTENDANT'S PANEL
B
PA AMPLIFIER (ELECTRONIC
EXTERNAL INTERPHONE
CHIME)  POWER
LOAD CONTROL AURAL WARNING CENTER, P18 CALL SWITCHUNIT (CHIME)
CONN FLIGHT SERVICE
NO FASTEN
NOSE SMOKING BELTS
PILOT WHEELWELL OFF
ON AUTO
NORM ON
CALL LIGHT
NOT IN USE
GRD
EXTERNAL POWER RECEPTACLE PANEL
CEILINGATTEND CALL (REF)
C
CALL
B
ATTENDANT'S CALL LIGHT
PILOTS' CALL SWITCHES  EXIT LOCATOR SIGN
(PINK) DE
Flight and Ground Crew Call Systems 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
 2.  Pilots' Overhead Panel
______________________
 A.  The pilots' forward overhead panel (P5) contains an ATTEND CALL switch, GRD CALL switch, and captain's call light. The ATTEND call switch signals attendants and the GRD CALL switch signals the ground crew. The blue CALL light illuminates when the flight crew is called by either the attendants or the ground crew.
　
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