B.  
All loads necessary for the indication are the usual airplane loads connected to each circuit.

 TASK 24-31-00-705-001
 2.  The Operation Test of the DC System___________________________________
 A.  General
 (1)  
This test uses the annunciator module M238 on the P6 panel. To get the indication from the M238, you must push the INDICATE / TEST switch S2 to the INDICATE position.

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 49-11-00/201, APU Power Plant

 C.  
Access

 (1)  
Location Zone
 101 Control Cabin, LH
 102 Control Cabin, RH
 205 Electronic Compartment

 D.  
Use the Airplane Battery to do a Test of the Battery Control and Indicator Circuits.

 (1)
Make sure that the BUS TRANS switch is in the AUTO position.

 (2)  
Remove the electrical power from the airplane (AMM 24-22-00/201).

 (3)  
Set the BAT switch to the OFF position.

 (4)  
Set the STANDBY POWER switches to the OFF position.

 S 865-002
 S 865-003
 S 865-004
 S 865-108
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737-300/400/500MAINTENANCE MANUAL
 S 865-109
 WARNING:_______MAKE SURE THAT PERSONS STAY CLEAR OF LEADING EDGE SLATS. THE LEADING EDGE SLATS CAN MOVE AUTOMATICALLY WHEN THE HYDRAULIC SYSTEM HAS PRESSURIZATION, OR THE AIR/GROUND RELAYS ARE IN THE AIR MODE.
 (5)  Open the following circuit breakers and attach the DO-NOT-CLOSE tags:
 (a)  
P6-4 Air Conditioning and Airstair Control AC Power Indication Panel. 1) C1065, DC BUS 1 2) C1066, DC BUS 2

 (b)  
P6-5 DC Power Indication Panel
 1) C145, BAT BUS CONT AUTO
 2) C790, GEN PWR CONT
 3) C789, BAT BUS CONT MANUAL
 4) C31, DC BUS PWR NO. 1
 5) C27, DC BUS PWR NO. 2
 6) C20, BAT BUS
 7) C167, BAT TRANS CONT
 8) C23, DC BUS INDICATION 1
 9) C134, DC BUS INDICATION HOT BAT
 10) C26, DC BUS INDICATION BAT
 11) C25, DC BUS INDICATION TRU 3
 12) C24, BUS/2 GALLEY PWR CONTROL

 (c)  
P18-5 Panel
 1) C22, HOT BATTERY BUS
 2) C169, SWITCHED HOT BAT BUS

 E. Procedure
 S 865-103
 (1) Remove the DO-NOT-CLOSE tag and close these circuit breakers:
 (a)  P18-5 Panel
 1) C22, HOT BATTERY BUS

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A 737-300/400/500MAINTENANCE MANUAL
 (b)  P6-5 Panel 1) C134, DC BUS INDICATION HOT BAT
 (2)  S 865-009Set the BAT switch to the ON position.
 (3)  S 865-005Turn the dc meter switch on the overhead panel to the BAT position. (a) Make sure that the dc voltmeter on the overhead panel shows 20 to 28 volts.
 (4)  S 865-008Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P6-5 Panel 1) C145, BAT BUS CONT AUTO 2) C167, BAT TRANS CONT 3) C26, DC BUS INDICATION BAT
 (5)  S 865-010Push the switch S2 to the INDICATE position. (a) Make sure that the BAT light on the M238 comes on.
 (6)  S 865-013Turn the dc meter switch to the BAT BUS position. (a) Make sure that the dc voltmeter shows 20 to 28 volts.
 (7)  S 865-014Turn the dc meter switch to the BAT position. (a) Make sure that the dc voltmeter shows 20 to 28 volts. (b) Make sure that the dc ammeter shows a negative value.
 (8)  S 865-020Open these circuit breakers and attach the DO-NOT-CLOSE tag: (a) P6-5 Panel 1) C145, BAT BUS CONT AUTO 2) C167, BAT TRANS CONT

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