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DC Annunciator Lights Simplified Schematic
Figure 3

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IF INSTALLED
DC Power System Simplified SchematicFigure 4
A 737-300/400/500MAINTENANCE MANUAL
F02412
A
737-300/400/500MAINTENANCE MANUAL
 B.  When the battery switch, located on the P5 panel, is set to the ON position, the GEN POWER CONTROL relay closes connecting the battery to the HOT SWITCHED BATTERY BUS.
 C.  When the STANDBY POWER switch is set to BAT, relay R326 is energized, and the battery provides power to the 28-volt dc bat bus.
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A
737-300/400/500MAINTENANCE MANUAL
 DC GENERATION SYSTEM - TROUBLE SHOOTING
_______________________________________
 1.  General_______
 A.  The trouble shooting procedures are based on the performance of the system adjustment/test and are presented in a tree-type format. The steps that make up the trouble shooting tree are connected by lines to sho OK condition path. When all steps on OK condition path check out, system is operable.
 B.  When a test step does not check out take corrective action listed. Perform specified corrective action, then repeat step at which failure occurred.
 C.  Trouble shooting procedures are based on the assumption that wiring is OK and electrical power is available. If corrective action does not correct problem, check wiring using the wiring diagram.
 D.  After completion of trouble shooting, check that system has been returned to normal.
 (1)  
Make sure that the circuit breakers on the P6-5 and P6-6 panels are closed.

 (2)  
Make sure that the BATTERY CHARGER circuit breaker on the battery control shield is closed.

 (3)  
Make sure that the STANDBY POWER switch is set to AUTO.

 (4)  
Make sure that the BUS TRANS switch is set to AUTO.

 (5)  
Remove electrical power if it is not necessary (Ref 24-22-00/201).

 (6)  
Make sure that the battery switch is set to OFF.

 2.  Prepare for Trouble Shooting____________________________
 A.  Supply external power (Ref 24-22-00/201).
 B.  Open DC circuit breakers on P6-5 and P6-6 panels ALL EXCEPT:
 (1)  
TR 3 DC INDICATION

 (2)  
DC BUS 2 INDICATION

 (3)  
DC BUS 1 INDICATION

 (4)  
HOT BAT BUS INDICATION

 (5)  
BAT BUS INDICATION

 (6)  
STDBY DC BUS INDICATION

 C.  
Make sure that the M238 electrical power annunciator panel is operable and DC BUS PWR ON lights on the module come on. Make sure that the M400 power system test module is serviceable.

 D.  
Make sure that the AC and DC meters on the P5 overhead panel operate and that the meters read correctly.

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A 737-300/400/500MAINTENANCE MANUAL

Troubleshoot DC Generation System
Figure 101 (Sheet 1)

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