(d)  
Identify the wires on the terminals for installation.

 (e)  
Remove the wires from the terminals on the battery charger.

 S 024-005
 (4)  Remove the battery charger (AMM 20-10-01/401).
 TASK 24-31-04-404-005
 3. Install the APU Battery Charger
_______________________________
 A. References
 (1)  
AMM 20-10-01/401, E/E Rack Mounted Components

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 B. Access
 (1)  
Location Zone
 154 Aft cargo compartment (Right)
 211/212 Flight compartment

 (2)  
Access Panel
 822 Aft cargo compartment door

 C. Install the battery charger
 S 424-006
 (1)  
Install the battery charger (AMM 20-10-01/401).

 S 434-007

 (2)  
Do these steps to connect the battery charger:

 (a)  
Install the wire, washer, lockwasher and nut on the positive terminal of the battery charger.

 (b)  
Tighten the nut on the positive terminal of the battery charger to 170-190 inch-pounds (19.2-21.5 Newton meters).

 (c)  
Install the wire, washer, lockwasher and nut on the negative terminal of the battery charger.

 (d)  
Tighten the nut on the negative terminal of the battery charger to 135-145 inch-pounds (15.3-16.4 Newton meters).

 (e)  
Install the terminal cover on the battery charger.

 (f)  
Connect the electrical connector to the battery charger.

 (g)  
Close the front cover on the E6 rack.

 S 864-008
 CAUTION: CLOSE THESE CIRCUIT BREAKERS IN THE SEQUENCE SHOWN TO PREVENT
_______
 DAMAGE TO THE APU BATTERY CHARGER.

 (3)  Remove the DO-NOT-CLOSE tag and close this circuit breaker on the E6 rack:
 (a)  APU BAT CHGR
 S 864-009
 (4)  Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P37 panel:
 (a)  37B5 OR 37K2, BATTERY CHARGERS APU
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757 MAINTENANCE MANUAL
 D.  Do a test of the battery charger installation
 S 864-010
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-011

 (2)  
Make sure the six EICAS circuit breakers on the overhead circuit breaker panel, P11, are closed.

 S 714-012

 (3)  
Do a test of the APU battery charger, as follows:

 (a)  
Push the ELEC HYD switch on the EICAS MAINT panel on the right side panel, P61.

 (b)  
Make sure the BAT switch on the standby power panel (P5) is in the ON position.

 (c)  
Turn the STBY POWER switch on the P5 panel to the BAT position for approximately one minute.

 (d)  
Make sure this value is below APU/BAT on the bottom EICAS display: 1) DC-V = 24 | 4

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

 NOTE:____Watch the EICAS display closely. The values on the display will change quickly.

 (f)  
Make sure these values show below APU/BAT on the bottom EICAS display: 1) DC-A value increases quickly to 38 | 5 2) DC-V value increases to 32 | 4 then decreases to 28 | 2

 NOTE: It will usually take less than one minute for the
____ voltage value to increase and then decrease. A fully discharged battery can extend this time to 75 minutes.
 3)  After the DC-V value decreases to 28 | 2, make sure the DC-A value is 0 | 5.
 S 864-013
 (4) Remove electrical power if it is not necessary (AMM 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL
　
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