TASK 33-51-04-902-001
 2.  Power Supply - Battery Replacement (Fig. 201)__________________________________
 A. General
 (1)  Before you install a new battery pack, you can do a test of the power supply with a voltmeter. This is to make sure the power supply will charge the new battery pack.
 B. References
 (1)  
AIPC 33-51-04

 (2)  
AMM 25-21-02/401, Upper Deck Window Reveal and Shade

 (3)  
AMM 25-22-03/401, Upper Deck Ceiling Panels

 (4)  
SSM 33-51-01 thru 33-51-99

 (5)  
WDM 33-51-12 thru 33-51-99

 C. Access
 (1)  Location Zone
 200 Upper Half of the Fuselage

 D. Battery Replacement
 S 862-063
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  On the overhead circuit breaker panel, P7: 1) 7G14, CHG EMER LT
 S 012-051
 (2)  Get access to the power supply.
 (a)  
On the upper deck, for a power supply above a ceiling panel, open the ceiling panel (AMM 25-22-03/401 and SSM 33-51-01 thru 33-51-06).

 (b)  
On the upper deck, for a power supply outboard of the floor, remove the window reveal (sidewall) panel (AMM 25-21-02/401 and SSM 33-51-01 thru 33-51-06).

 NOTE: It is not necessary to remove the seats.
____
 S 962-052
 (3)  Replace the battery pack.
 (a)  Remove the battery pack. 1) Loosen the fasteners on the battery pack.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

QUICK-RELEASE FASTENERS (2 LOCATIONS)

NOT INSTALLED ON ALL POWER SUPPLIES
Power Supply Installation Figure 201
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 CAUTION: BEFORE YOU LIFT THE BATTERY PACK, MAKE SURE THE PINS
_______ ON THE BATTERY PACK ARE CLEAR OF THE SOCKET. FAILURE TO DO THIS CAN CAUSE DAMAGE TO THE PINS OR THE BATTERY PACK.
 2)  Move the battery pack away from the power supply until the pins are clear of the socket.
 (b)  Install the replacement battery pack.
 1)  If it is necessary to know if the power supply can charge the new batteries, then do this test of the power supply: a) Connect a resistor between the probes of a voltmeter.
 NOTE: Use a 22 ohm, 10 watt resistor.
____
 b) With the voltmeter, make sure there is 8 volts dc between the battery connector pins of the power supply. 2) Look at the installation date on the battery pack to make sure the battery pack can be used. 3) Put the replacement battery pack in its position on the
 power supply. 4) Move the battery pack forward to engage the pins. 5) Tighten the fasteners.
 S 862-064
 (4) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  On the overhead circuit breaker panel, P7:
 1) 7G14, CHG EMER LT

 E.  Power Supply Test
 NOTE:____You can do a test of all the power supplies together. Each power supply with a test switch can be tested independently.
 S 712-053
 (1) To do a test of all the power supplies together, do these steps:
 CAUTION: KEEP THE OPERATION OF THE EMERGENCY LIGHTS TO LESS THAN A
_______ ONE MINUTE. THE BATTERIES MUST KEEP A SUFFICIENT CHARGE TO OPERATE THE EMERGENCY LIGHTS FOR 15 MINUTES.
 (a)  
On the pilot's overhead panel, P5, set the EMER LIGHTS switch to the ON position. 1) Make sure the emergency lights connected to the power

 supply come on (SSM 33-51-01).

 (b)  
Set the EMER LIGHTS switch to the OFF position. 1) Make sure the emergency lights go off.

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