(c)  
Put the replacement battery pack in the power supply assembly.

 (d)  
Carefully move the battery pack forward until the pins of the two connectors are fully engaged.

 (e)  
Turn the quick-release fasteners clockwise to the detent position.

 S 862-035
 (3)  Remove the DO-NOT-CLOSE tag and close this circuit breaker:
 (a)  Load Control Center - Left, P18
 1) EMER EXIT LTS AND PWR

 S 712-004
 (4)  Do a test of the battery pack.
 NOTE: You can do a test of each battery pack independently or all
____
 the battery packs together.

 (a)  To do a test of each battery pack independently, do these steps: 1) Push the test switch on the power supply.
 a)  Make sure the emergency lights connected to the battery pack come on (SSM 33-51-00). b) Make sure the emergency lights go off automatically after approximately 1 minute.
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 (b)  To do a test of all the battery packs together, do these steps: 1) Set the emergency lights switch on the P5 panel to ON. a) Make sure the emergency lights connected to the replacement battery pack are on (SSM 33-51-00).
 2)  Set the switch to OFF. a) Make sure the emergency lights are off.
 F.  Put the airplane back to its usual condition.
 S 412-020
 (1)
Close the panels you opened to get access to the power supplies.

 S 862-019

 (2)  
If the batteries in the replacement battery pack are not fully charged, supply electrical power for 16 hours (AMM 24-22-00/201).

 NOTE: This will prepare the emergency lights for a flight of the
____
 airplane.

 TASK 33-51-51-962-016
 4.  Power Supply Replacement (Fig. 201)
________________________
 A.  References
 (1)  
AMM 20-40-12/201, Electrostatic Discharge Sensitive Devices

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

 (3)  
AMM 25-21-45/401, Sculptured Ceiling Panels

 (4)  
AMM 25-21-71/401, Lowered Ceiling Panels

 (5)  
SSM 33-51-00

 B.  Access
 (1)  Location Zone
 107 Forward Half of Cabin
 108 Aft Half of Cabin

 C.  Prepare for the replacement of the power supply.
 S 862-031
 (1)  Open this circuit breaker and attach a DO-NOT-CLOSE tag:
 (a)  Load Control Center - Left, P18
 1) EMER EXIT LTS AND PWR

 S 012-024
 (2)  Get access to the power supply (SSM 33-51-00).
 (a)  
For a power supply installed on or above an entry light, lower the hinge panel for the entry light (AMM 25-21-71/401).

 (b)  
For a power supply installed on an air outlet duct, lower the sculptured ceiling panel below the power supply (AMM 25-21-45/401).

 (c)  
For a power supply installed on an overhead stowage bin, lower the sculptured ceiling panel above the overhead stowage bin (AMM 25-21-45/401).

 (d)  
For a power supply installed above a lowered ceiling panel, remove the lowered ceiling panel (AMM 25-21-71/401).

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 (e)  For a power supply installed behind a sidewall carpet riser, remove the sidewall carpet riser.
 S 862-034
 CAUTION: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ POWER SUPPLY. A FAILURE TO DO THE STEPS CORRECTLY CAN CAUSE DAMAGE TO THE EQUIPMENT.
 (3)  Do this task to remove the power supply: "Electrostatic Discharge Sensitive Devices" (AMM 20-40-12/201).
 D. Procedure
 S 962-027
 (1)  Replace the power supply.
　
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