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737-300/400/500MAINTENANCE MANUAL
 4) Close the DC STBY POWER BAT circuit breaker.
 S 735-016
 (4)  Do a test of the inverter supply to standby power bus:
 (a)  
Open the STANDBY POWER AUTO CONT circuit breaker on the P6-5 panel. 1) Make sure that the STANDBY PWR OFF light is not on. 2) Make sure that the ac meters switch is in the STBY PWR

 position.
 a) Make sure that the AC voltmeter shows 115 |5 volts.
 b) Make sure that the frequency meter shows 400 | 5 Hz.

 (b)  
Turn the DC meters switch to BAT BUS. 1) Make sure that the DC voltmeter shows 26 |4 volts.

 (c)  
Close the STANDBY POWER AUTO CONT circuit breaker on the P6-5 panel.

 (d)  
Open the STBY BUS PWR circuit breaker on the P6-4 panel. 1) Make sure that the ac voltmeter shows zero volts. 2) Make sure that in approximately two seconds the ac

 voltmeter shows 115 |5 volts ac. 3) Close the STBY BUS PWR circuit breaker on the P6-4 panel.
 S 735-017
 (5)  Do a test of the manual selection of the standby power bus:
 (a)  
Move the STANDBY POWER switch to OFF.
 1) Make sure the STANDBY PWR OFF light comes on.
 2) Turn the ac and dc meters switches to STBY PWR.
 3) Make sure that 0 volts shows on the two meters.
 4) Turn the dc meters switch to BAT BUS.
 5) Make sure 26 |4 volts dc shows on the meter.

 (b)  
Move the STANDBY POWER switch to BAT. 1) Make sure that the STANDBY PWR OFF light goes off. 2) Make sure that the DC voltmeter shows 26 |4 volts. 3) Make sure that the AC voltmeter shows 115 |5 volts. 4) Turn the dc meters switch to STBY PWR. 5) Make sure that the dc voltmeter shows 26 |4 volts.

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 6) Push the INDICATE/TEST switch (S2) on the annunciator
 lights module (M238) to INDICATE.
 7) Make sure that these lights on the annunciator lights
 module (M238) come on:
 a) The DC BUS PWR ON STBY light
 b) The AC BUS PWR ON STBY light.
 S 735-018
 (6) Do a test of the standby power off/master caution time delay:
 (a) If it is necessary, push the MASTER CAUTION light to make it go
 off.
 (b) Move the STANDBY POWER switch to OFF.
 1) Make sure that the STANDBY PWR OFF light comes on.
 2) Make sure that approximately 1 second subsequently the
 MASTER CAUTION light comes on.
 ú
 ú  S 865-038
 ú  (7) Supply external or APU generator power (AMM 24-22-00/201).
 ú  (a) Put the STANDBY POWER switch to BAT.
 ú  1) Make sure the DC voltmeter shows 24 +/- 4 volts.
 E.  Put the airplane back to its usual condition.
 S 865-019
 (1) Make sure that these circuit breakers on the P6-5 panel are closed:
 (a) The BAT BUS CONT AUTO circuit breaker
 (b) The BAT BUS circuit breaker
 S 865-021
 (2) Move the STANDBY POWER switch to AUTO.
 S 865-022
 (3) Remove external power if it is not necessary (Ref 24-22-00/201).

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 DC POWER DISTRIBUTION - DESCRIPTION AND OPERATION
　
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