757
MAINTENANCE MANUAL

 S 866-032
 (14)
 Turn the STBY POWER switch to the AUTO position.

 S 216-033

 (15)
 Make sure these values show below STBY/BAT on the bottom EICAS display:

 NOTE: These values show that the main battery is in a charge cycle.
____ A charge cycle of one to five minutes is usual, however, a fully discharged battery requires 75 minutes to charge.
 DC-A 38 |2 DC-V 33 |4
 S 216-034
 (16) When the battery charge cycle is complete, make sure the DC-A value below STBY/BAT decreases suddenly (1-2 seconds) from 38 + or - 5 to 0 + 5.
 NOTE: If the DC-A value decreases slowly, there is a failure in the
____ main battery charger or its external circuit.
 S 216-035
 (17) Make sure this value shows below STBY/BAT on the bottom EICAS display:
 DC-V 28 |2
 S 866-036
 (18)
 Push the STATUS switch on the EICAS display select panel on the forward electronics panel, P9.

 S 216-037

 (19)
 Make sure the EICAS message, MAIN BAT CHRG, does not show on the bottom display.

 S 866-018

 (20)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 24-33-00-726-017
 3. Functional Test - 115 volt AC Standby Power Generation
_______________________________________________________
 A. References
 (1)
AMM 24-22-00/201, Electrical Power - Control

 (2)
AMM 27-61-00/201, Spoiler/Speedbrake Control System

 B. Access
 (1)  Location Zones
 211/212 Flight compartment

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A

757 MAINTENANCE MANUAL
 C. Prepare for Examination
 S 866-002
 (1)  Supply electrical power (AMM 24-22-00/201).
 S 866-015
 WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES WHEN
_______ HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
 (2)  Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or remove all persons and equipment from the spoiler area.
 D. Procedure
 S 216-012
 (1)  Do a check of the standby power system as follows:
 (a)  
Make sure the BAT switch on the P5 panel is in the ON position.

 (b)  
Turn the STBY POWER switch on the P5 panel to the OFF position.

 (c)  
Make sure the yellow OFF light adjacent to the STBY POWER switch comes on.

 (d)  
Make sure the EICAS message, STANDBY BUS OFF, shows on the upper display.

 (e)  
Turn the STBY POWER switch on the P5 panel to the AUTO position.

 (f)  
Make sure the yellow OFF light adjacent to the STBY POWER switch goes off.

 (g)  
Push the ELEC HYD switch on the EICAS maintenance panel on the right side panel (P61).

 (h)  
Make sure the values that follow show on the bottom EICAS display:

 STBY BAT:  AC-V = 115 |5 FREQ = 400 |5 DC-V = 28 |2
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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757 MAINTENANCE MANUAL
 APU/BAT: DC-V = 28 |2
 (i)  Make sure the EICAS message, STANDBY BUS OFF, does not show on the bottom display.
 (j) AIRPLANES WITH 30-MINUTE STANDBY POWER; Do the Main Battery Charger and Current Monitor test as follows: 1) Turn the STBY POWER switch on the P5 panel to the BAT position. 2) Make sure the yellow DISCH light on the P5 panel comes on. 3) Make sure the EICAS message, MAIN BAT DISCH, shows on the
 top display. 4) Make sure the value that follows is below STBY/BAT on the bottom EICAS display:
　
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