(l)  
Push the ECS MSG switch on the EICAS MAINT panel on the P61 panel.

 (m)  
Make sure the EICAS message, MAIN BAT CHGR, does not show on the top display.

 S 715-380
 (2)  AIRPLANES WITH EXTENDED STANDBY POWER; Do the Main and APU Battery Charger and Current Monitor test as follows:
 (a)  
Make sure the bottom EICAS display is in the ELEC HYD mode. Push the ELEC HYD switch on the EICAS MAINT panel on the right side panel P61 panel, if necessary.

 (b)  
Make sure the BAT switch, on the P5 panel, is set to the ON position.

 (c)  
Turn the STBY POWER switch, on the P5 panel, to the BAT position.

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 (d) (e) (f)  Make sure the MAIN BAT DISCH and APU BAT DISCH lights on the P5 panel come on.Make sure the EICAS messages, MAIN BAT DISCH and APU BAT DISCH, show on the top EICAS display.Make sure these values show below STBY/BAT on the bottom EICAS display: 1) DC-V = 25 |2 2) DC-A a number larger than 4 in quantity
 NOTE:____ This value will have a minus sign in front of it to show that it is a discharge current.
 (g) (h) (i) (j) (k)  Make sure these values show below APU/BAT on the bottom EICAS display: 1) DC-V = 25 |2 2) DC-A = 0After one minute, turn the STBY POWER switch, on the P5 panel, to the AUTO position.Make sure the MAIN BAT DISCH and APU BAT DISCH lights on the P5 panel go off.Make sure the DC-A value is 38 |5 below STBY/BAT and APU/BAT on the bottom EICAS display.Make sure the DC-V values below STBY/BAT and APU/BAT increase to 33 |4 volts and then decrease to 28 |2 volts.
 NOTE:____ It will usually take from 1 to 5 minutes for the voltage values to increase and then decrease. However, a fully discharged battery will extend this time to 75 minutes.
 (l) (m) (n)  After the DC-V value below STBY/BAT and APU/BAT decreases to 28 |2 volts, make sure the DC-A value below STBY/BAT and APU/BAT is 0 |5 amps.Push the ECS MSG switch on the EICAS MAINT panel on the P61 panel.Make sure the EICAS messages, MAIN BAT CHGR and APU BAT CHGR, do not show on the top display.

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 D. Put the Airplane Back To Its Usual Condition
 S 445-128
 (1)  
Do the activation procedure for the spoilers if you did the deactivation procedure (AMM 27-61-00/201).

 S 865-129

 (2)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 24-30-00-715-061
 4.  Operational Test - DC Tie Control Unit and DC Tie Relay_______________________________________________________
 NOTE: This is a scheduled maintenance task.
____
 A. References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

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

 B. Prepare for the Operational Test
 S 045-057
 (1)  Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or remove all the persons and equipment from the spoiler area.
 S 865-058
 WARNING: MAKE SURE THE SPOILERS ARE DEACTIVATED OR THAT ALL PERSONS AND
_______ EQUIPMENT ARE REMOVED FROM THE SPOILER AREA. POWER SOURCES ARE CHANGED AS SWITCHES ARE PUSHED OR CIRCUIT BREAKERS ARE OPENED, WHICH CAN CAUSE MOVEMENT OF THE SPOILERS. ACCIDENTAL MOVEMENT OF THE SPOILERS CAN INJURE PERSONS OR DAMAGE EQUIPMENT.
 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 715-139

 (3)  
Do the DC Tie Control Unit and DC Tie Relay Operational Test as follows:

 (a)  Make sure the two BUS TIE switches on the P5 panel are set to the AUTO (latched-in) position.
 NOTE: The ISLN light in each switch should be off.
____
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