757 MAINTENANCE MANUAL
 D. Do a Test of 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 115V GND SVCE HOT BUS on the P37 panel is on.

 S 864-007

 (3)  
Push the right BUS TIE switch on the P5 panel, to the AUTO position.

 S 714-008

 (4)  
Make sure the warning light on the P37 panel 115V GND SVCE HOT BUS is on.

 S 864-009

 (5)
Remove external power if it is not necessary (AMM 24-22-00/201).

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757 MAINTENANCE MANUAL
 GROUND SERVICE SELECT RELAY - REMOVAL/INSTALLATION
__________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the ground service select relay (referred to as the relay) from the airplane. The second task installs the relay on the airplane.
 TASK 24-51-04-024-001
 2.  Remove the Ground Service Select Relay (Fig. 401)
______________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

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

 B.  Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 211/212 Flight Compartment

 (2)  
Access Panel
 119AL Main Equipment Center

 C.  Prepare for the Removal
 S 044-011
 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 044-012
 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 864-013

 (3)  
Open this main power distribution panel P6 circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  6B4, BUS PWR CONT UNIT
 S 024-014
 (4)  Remove the relay as follows:
 (a)  
Open the P34 panel.

 (b)  
Remove the terminal cover on the relay.

 (c)  
Remove the wires from the relay.

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757
MAINTENANCE MANUAL

Ground Service Select Relay Installation
Figure 401

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757 MAINTENANCE MANUAL
 (d)  
Remove the installation screws which attach the relay to the P34 panel.

 (e)  
Remove the relay.

 TASK 24-51-04-424-002
 3.  Install the Ground Service Select Relay (Fig. 401)_______________________________________
 A. Reference
 (1)  AMM 24-22-00/201, Electrical Power - Control
 B. Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 211/212 Flight Compartment
　
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