23-41-00
 ALL  ú ú 01 Page 7 ú Jul 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 SERVICE INTERPHONE SYSTEM - TROUBLE SHOOTING
____________________________________________
 1.  General_______
 A.  On airplanes with AUDIO ACCESSORY UNITS, the service interphone system is made up of attendants handsets and a control stand handset jack. Each component is directly connected to the service interphone amplifier. If nothing is heard at a given station, amplifier failure is apparent. If only the interphone jacks connected through the service interphone switch are not working then the switch is bad or a service interphone jack is shorted. Failure of one jack or handset can be found when a handset is moved from station to station.
 B.  On airplanes with REMOTE ELECTRONIC UNITs, The service interphone system is made up of attendants' handsets and a control stand handset jack. Each component is directly connected to the remote electronics unit. If nothing is heard at a given station, remote electronics unit failure is apparent. If only the interphone jacks connected through the service interphone switch are not working then the switch is bad or a service interphone jack is shorted. Failure of one jack or handset can be found when a handset is moved from station to station.
 C.  If the service interphone system is not working at all, check that power is available and the applicable circuit breaker on the load control center P6 is closed:
 SERV INPH AMPLIFIER (airplanes with AUDIO ACCESSORY UNIT) INTPH AND WARNING (airplanes with REMOTE ELECTRONIC UNIT)
 D.  If power is available, replace the audio accessory unit or remote electronic unit, as applicable.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 23-41-00
 ALL  ú ú 03 Page 101 ú Mar 15/90
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 SERVICE INTERPHONE SYSTEM - ADJUSTMENT/TEST
___________________________________________
 1.  General
_______
 A.  This procedure has one task. The task is a test of the service interphone system. Do the task that follows when a jack, handset, audio accessory unit or remote electronics unit is replaced.
 NOTE: Clean all handset plugs before you put the plug into the
____ jack. Dirt can cause the jack to operate intermittently.
 TASK 23-41-00-735-003
 2.  Service Interphone System Test
______________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 23-51-00/501, Flight Interphone System

 B.  Access
 (1)  Location Zone
 101/102 Control Cabin
 107/108 Cabin

 C.  Procedure
 S 865-001
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-002

 (2)  
Make sure the flight interphone system is serviceable (AMM 23-51-00/501).

 S 865-015

 (3)  
Set the service interphone ON-OFF switch on the overhead panel to the ON position.

 S 865-008

 (4)  
Push the SERV INT mic selector switch and its audio listen switch to ON position on all the audio selector panels.

 (5)  
Set the audio listening switch to the middle (mid range) position.

 S 715-011

 (6)  
Do the test for the Service Interphone System:

 S 865-009
 (a)  Use the handset at the control stand to make good communications with the stations that follow: 1) The forward attendant's station 2) The aft attendant's station 3) The aft cabin ceiling 4) The electronics equipment rack 5) The external power panel P19 6) The right wheel well station
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 23-41-00
 ALL  ú ú 02 Page 501 ú Nov 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 7) The left wheel well station 8) The right wing refueling station 9) The APU (Auxiliary Power Unit) access panel
　
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