(h)  
Do the Maintenance Message Erase procedure (AMM 31-41-00/201).

 (i)  
Make sure the EICAS messages, MAIN BAT CHGR and APU BAT CHGR, stay shown on the lower display.

 NOTE: The messages can blink when erase procedure is tried,
____ but must remain shown.
 (j)  
Turn the STBY POWER switch on the P5 panel to the BAT position and permit the switch to stay in this position for at least 5 seconds.

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

 (l)  
Do the Maintenance Message Erase procedure (AMM 31-41-00/201).

 (m)  
Make sure the EICAS messages, MAIN BAT CHGR and APU BAT CHGR, do not show on the upper display.

 G. Put the Airplane Back To Its Usual Condition
 S 445-393
 (1)  
Do the activation procedure for the spoilers if you did the deactivation procedure (AMM 27-61-00/201).

 S 865-394

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

 TASK 24-30-00-715-049
 3. Operational Test - Battery Charger and Current Monitor
______________________________________________________
 NOTE: This is a scheduled maintenance task.
____
 A. References
 (1)  AMM 24-22-00/201, Electrical Power - Control
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757 MAINTENANCE MANUAL
 (2)  AMM 27-61-00/201, Spoiler/Speedbrake Control System
 B. Prepare for the Operational Test
 S 045-055
 (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 865-056
 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 THE SPOILERS TO MOVE. ACCIDENTAL MOVEMENT OF THE SPOILERS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Supply electrical power (AMM 24-22-00/201).
 C. Do the operational test
 S 715-381
 (1)  AIRPLANES WITH 30-MINUTE STANDBY POWER; Do the Main 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.

 (d)  
Make sure the DISCH light on the P5 panel comes on.

 (e)  
Make sure the EICAS message, MAIN BAT DISCH, shows on the top display.

 (f)  
Make sure these values show below STBY/BAT on the bottom EICAS display: 1) DC-V = 25 |2

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MAINTENANCE MANUAL

 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)  
After one minute, turn the STBY POWER switch, on the P5 panel, to the AUTO position.

 (h)  
Make sure the DISCH light on the P5 panel goes off.

 (i)  
Make sure the DC-A value is 38 |5 below STBY/BAT on the bottom EICAS display.

 (j)  
Make sure the DC-V value below STBY/BAT increases to 33 |4 volts and then decreases to 28 |2 volts.

 NOTE: It will usually take from one to five minutes for the
____ voltage value to increase and then decrease. But a fully discharged battery can extend this time to 75 minutes.
 (k)  
After the DC-V value below STBY/BAT decreases to 28 |2 volts make sure the DC-A value below STBY/BAT is 0 |5 amps.
　
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