S 864-015

 (4)  
Remove the DO-NOT-CLOSE identifiers and close these circuit
 breakers:

 (a)  
P183 Relay Panel
 1) APU BATTERY CHGR OUTPUT
 2) APU BATTERY CHARGER

 E. Do a Test of the APU Battery Charger
 S 864-012
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 714-009

 (2)  
Do a test of the APU battery charger:

 (a)  
AIRPLANES WITH BATTERY CHARGER AND BATTERY LIGHTS. Make sure the battery charger light is on.

 (b)  
Get access to the EXISTING FAULTS page for Chapter 24 (if any) on the CMCS (AMM 45-10-00/201).

 (c)  
Make sure the CMCS messages for the APU battery charger do not show.

 (d)  
Get access to the maintenance page for the electrical system (AMM 45-10-00/201).

 (e)  
Make sure the DC-Volts for the APU battery is more than 24 volts.

 (f)  
Make sure the charge mode for DC-Amps is positive (between 31 to 43 amps).

 (3)
Remove electrical power, if it is not necessary (Ref 24-22-00/201).

 S 864-013
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A
747-400 MAINTENANCE MANUAL
 APU BATTERY CHARGER DISABLE RELAY - REMOVAL/INSTALLATION
________________________________________________________
 1.  General_______
 A.  This procedure has two tasks. One task is the removal of the disable relay (R7218) for the APU battery charger. The other task is the installation of the disable relay.
 B.  The installation task includes an operational test of the disable relay.
 C.  The disable relay is installed behind the P183 panel, in the E-33 equipment rack. The equipment rack is on the left side of the closet at the aft end of the passenger cabin. Access to the E-33 equipment rack is through the E-33 access door.
 TASK 24-31-08-004-001
 2.  APU Battery Charger Disable Relay Removal (Fig. 401)_________________________________________
 A.  References
 (1)  
24-22-00/201, Manual Control

 (2)  
IPC 24-31-07 Fig. 2

 (3)  
WDM 24-31-21

 (4)  
SSM 24-31-02

 B.  
Access

 (1)  
Location Zone
 271 Passenger Cabin, LH

 (2)  
Access Panel
 P183 E-33 Equipment Center Panel

 C.  
Procedure

 (1)  
Make sure all electrical power is off (Ref 24-22-00/201).

 S 864-022

 (2)  
Make sure the BATTERY switch, on the P5 panel, is set to OFF and attach a DO-NOT-OPERATE tag.

 S 864-023

 (3)
Disconnect the electrical connectors from the APU battery.

 (a)  
Turn the knob on the APU battery connector (DM7432A) counterclockwise until the connector is free from the main battery receptacle.

 S 864-003
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A
747-400
MAINTENANCE MANUAL

NOTE:RELAY LOCATED BEHIND P183 CIRCUIT BREAKER/RELAY PANEL.
APU Battery Charger Disable Relay Installation
Figure 401

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A
747-400 MAINTENANCE MANUAL
 S 024-017
 (4)  
Remove the disable relay:

 (a)  
Remove the screws that attach the P183 panel to the E-33 equipment rack.

 (b)  
　
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