C. Procedure
 S 862-103
 (1)  
Turn the applicable engine(s) off (AMM 71-00-00/201).

 S 212-104

 (2)  
Make sure that the DRIVE lights on the DRIVE DISC 1, 2, 3, and 4 switches are on.

 NOTE: Most of the switches and lights you must use are on the
____ P5 overhead panel. Other panels you must use will be identified in the procedure.
 S 212-105
 (3)  Make sure that the OFF lights on the GEN CONT 1, 2, 3, and 4 switches are on.
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747-400 MAINTENANCE MANUAL
 S 862-106
 (4)  
Set the STANDBY POWER switch to OFF. S 862-114

 THE APU WILL NOT START IF THE APU BATTERY IS DISCHARGED.

 (5)
Set the BATTERY switch to OFF.

 CAUTION:_______ THE BATTERY SWITCH MUST BE OFF WHEN ELECTRICAL POWER IS REMOVED
 FROM THE AIRPLANE.  IF THE BATTERY SWITCH IS ON WITH NO AC
 POWER ON THE AIRPLANE, THE BATTERIES CAN BECOME DISCHARGED.

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747-400 MAINTENANCE MANUAL
 ELECTRICAL SYSTEM CONTROL MODULE - REMOVAL/INSTALLATION
_______________________________________________________
 1.  General_______
 A.  This procedure has three tasks. The first task is a removal of the control module (M7307) for the electrical system. The second task is an installation of the control module. The third task is an operational test of the control module.
 B.  The control module is installed in the P5 panel.
 TASK 24-22-01-004-001
 2.  Electrical System Control Module Removal (Fig. 401)________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AIPC 24-22-55, Fig. 1

 (3)  
WDM 24-11-11 thru WDM 24-11-14, WDM 24-22-11 thru WDM 24-22-41, WDM 24-22-72 thru WDM 24-22-74, WDM 24-27-21 thru WDM 24-27-31, WDM 24-31-11 thru WDM 24-31-21, WDM 24-33-21, WDM 24-41-12, WDM 24-41-22

 (4)  
SSM 24-11-01 thru SSM 24-11-04, SSM 24-22-01 thru SSM 24-22-05, SSM 24-31-01 thru SSM 24-31-02, SSM 24-33-01 thru SSM 24-33-02, SSM 24-34-02 thru SSM 24-34-03, SSM 24-41-01 thru SSM 24-41-03

 B.  
Access

 (1)  
Location Zone
 221 Control Cabin, LH

 (2)  
Access Panel
 P5 Overhead Panel

 C.  
Procedure

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

 (2)
Make sure the BATTERY switch, on the P5 panel, is set to OFF.

 S 034-004

 (3)  
Disconnect the main battery connector (DM7423B) and the APU battery connector (DM7432B) from the batteries.

 S 864-002
 S 864-003
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747-400
MAINTENANCE MANUAL

PILOTS'OVERHEAD PANEL P5
SEE A
ELECTRICAL SYSTEM CONTROL MODULE (M7307)
A
Electrical System Control Module Installation Figure 401
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