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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 - TROUBLE-SHOOTING
_____________________________________________________
 1.  General_______
 A.  This procedure has one task, to do trouble-shooting on the flight and ground crew call system.
 B.  To do this task the wiring must be good and electrical power must be available. If the steps in the procedure do not correct the problem, use the wiring diagrams to do more trouble-shooting.
 2.  Flight and Ground Crew Call System Trouble-shooting Chart_________________________________________________________
 A.  References
 (1)  24-22-00/201, Manual Control
 B.  Access
 (1)  Location Zone
 101/102 Control Cabin

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

 (2)  
Make sure this circuit breaker is closed:

 (a)  P18 Load Control Center - Left
 1) PASS & CREW CALL/LAV SMK DET

 PASS & CREW CALL  (on airplanes without lavatory smoke detectors)
 (3)  Do the trouble-shooting procedure:
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | PROBLEM | CAUSE | PROCEDURE | CORRECTION | ................................................................................ | Pilots' CALL | CAPTAIN call | Call from a different | Replace the| | light and | switch on that | station. If both the call | CAPTAIN call| | chime do not | panel | light and chime operate --| switch at the| | operate. | | | unserviceable| | | | | station.| | | | | | | Pilots' chime| Aural warning | Remove the D940 electrical | Replace the| | does not | unit module, M315| connector from the aural | module.| | operate from | | warning unit module.| | | any attendant| | Connect a voltmeter across| | | station | | pins 6 and 7 of the| | | | | connector. Push a CAPTAIN| | | | | call switch. The voltmeter| | | | | will show 28v dc. If the| | | | | correct voltage shows --| | | | | | | | CALL light | CALL light | Push the MASTER DIM & TEST | Replace the| | does not | | switch. If the CALL light | unserviceable| | operate from | | does not come on --| bulbs in the| | any station | | | CALL light.| | | | | | | | | | |
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~.............................................................................. | PROBLEM | CAUSE | PROCEDURE | CORRECTION | ................................................................................
 |  The attendant|  ATTENDANT call  |  Call from another station.  |  Replace the |
 |  call lights  |  switch at that  |  If the call lights and  |  ATTENDANT call|
 |  and chime do  |  station  |  chime operate -- |  switch at the |
 |  not operate  |  |  |  unserviceable |
 |  |  |  |  station. |
 |  |  |  |  |
 |  Call lights  |  RESET switch in  |  Push and release the ATTEND|  Replace the |
 |  stay on only  |  an attendant  |  call switch on the P5  |  unserviceable |
 |  as long as  |  panel  |  panel.  If the related call|  RESET switch |
 |  you push the  |  |  light also stays on only as|  in one of the |
 |  ATTENDANT  |  |  long as you push the call  |  attendant |
 |  call switch  |  |  switch -- |  panels.  They |
　
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