(2)  
Access Panel
 119AL Main Equipment Center

 C. Procedure
 S 424-003
 (1)  Install the relay as follows:
 (a)  
Attach the relay to the P34 panel with the installation screws.

 (b)  
Connect the wires to the relay.

 (c)  
Install the terminal cover on the relay.

 (d)  
Close the P34 panel.

 S 864-004
 (2)  Remove the DO-NOT-CLOSE tag, and close this P6 panel circuit breaker:
 (a)  6B4, BUS PWR CONT UNIT
 D. Do a test on the relay installation
 S 864-005
 (1)  
Supply external power to the ground service bus (AMM 24-22-00/201).

 S 714-006

 (2)  
Make sure the warning light on the P37 panel 115V GND SVCE HOT BUS is on.

 (3)  
Push the ground service switch on the P21 panel.

 (4)
Supply APU power to the ground service bus (AMM 24-22-00/201).

 S 864-009

 (5)  
Make sure the warning light on the P37 panel 115V GND SVCE HOT BUS is on.

 S 864-007
 S 864-008
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757 MAINTENANCE MANUAL
 S 864-010
 (6) Remove APU power if it is not necessary (AMM 24-22-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
 CENTER BUS TRANSFER RELAY - REMOVAL/INSTALLATION
________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the center bus transfer relay (referred to as the relay) from the aiirplane. The second task installs the center bus transfer relay on the airplane.
 TASK 24-51-05-024-001
 2.  Remove the Center Bus Transfer Relay (Fig. 401)
____________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 27-61-00/201, Speedbrake/Spoiler Control System

 B.  Access
 (1)  Location Zones
 211/212 Flight Compartment

 C.  Prepare for the Removal
 S 044-002
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPOILERS OR MOVE ALL
_______ PERSONS AND EQUIPMENT AWAY FROM THE SPOILERS. THE SPOILERS CAN RETRACT QUICKLY AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or move all persons and equipment away from the spoilers.
 S 044-003
 WARNING: REMOVE THE ELECTRICAL POWER FROM THE AIRPLANE WHEN YOU REMOVE
_______ OR INSTALL COMPONENTS IN THE POWER PANELS. HIGH VOLTAGES CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Remove electrical power (AMM 24-22-00/201).

 S 864-004

 (3)  
Open these main power distribution panel P6 circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
6D2, BAT XFR CONT

 (b)  
6L12, CENTER BUS DC

 D.  Procedure
 S 024-005
 (1)  Remove the relay as follows:
 (a)  
Open the P6 panel.

 (b)  
Remove the relay from the P6 panel.

 TASK 24-51-05-424-006
 3.  Install the Center Bus Transfer Relay (Fig. 401)
_____________________________________
 A.  References
 (1)  AMM 22-41-00/501, Maintenance Monitor
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