S 864-045

 (2)  
Make sure the six EICAS circuit breakers on the overhead circuit breaker panel (referred to as the P11 panel) are closed.

 S 864-047

 (3)  
Make sure these circuit breakers on the P6 panel are closed:

 (a)  
6C11, L DC VOLT SENSE

 (b)  
6H10, R DC VOLT SENSE

 S 714-011
 (4)  Do a test of the TRU installation, as follows:
 (a)  
Open this circuit breaker on the P6 panel:
 1) 6A6, DC BUS TIE CONT

 (b)  
After five seconds close this circuit breaker on the P6 panel: 1) 6A6, DC BUS TIE CONT

 (c)  
Push the ECS MSG switch on the EICAS MAINT panel on the right side panel, P61.

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 (d)  
Make sure the EICAS message, TR UNIT, message does not show on the bottom display.

 (e)  
Push the ELEC HYD switch on the EICAS MAINT panel.

 (f)  
Make sure the DC-V value under L or R (as applicable) is 28 |4 on the bottom EICAS display.

 (g)  
Make sure the DC-A value under L or R (as applicable) is not zero on the bottom EICAS display.

 S 864-048
 (5)  
Do the activation procedure for the spoilers if you did the deactivation procedure (AMM 27-61-00/201).

 S 864-046

 (6)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

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 DC TIE RELAY - REMOVAL/INSTALLATION
___________________________________
 1.  General
_______
 A.  The DC tie relay, K108, is in the main power distribution panel, P6, in the flight compartment.
 TASK 24-32-02-024-013
 2.  Remove the DC Tie 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 Zone
 211/212 Flight compartment

 C.  Prepare for Removal
 S 864-001
 WARNING: KEEP PERSONS AND EQUIPMENT AWAY FROM ALL CONTROL SURFACES
_______ WHEN HYDRAULIC POWER IS SUPPLIED. AILERONS, ELEVATORS, RUDDER, FLAPS, SLATS, SPOILERS, AND STABILIZER ARE FULLY POWERED SURFACES. INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR WHEN HYDRAULIC POWER IS SUPPLIED.
 (1)  
Do the deactivation procedure for the spoilers (AMM 27-61-00/201) or move all persons and equipment away from the spoilers.

 S 864-002

 (2)  
Remove electrical power (AMM 24-22-00/201).

 S 014-003
 WARNING: REMOVE ALL ELECTRICAL POWER FROM THE AIRPLANE BEFORE YOU
_______ OPEN THE P6 PANEL. VOLTAGES IN THE P6 PANEL CAN CAUSE SERIOUS TO PERSONS.
 (3)  
Open the P6 panel.

 S 024-004

 (4)  
Do these steps to remove the DC tie relay.

 (a)  
Identify the leads on the DC tie relay for installation.

 (b)  
Remove the leads from the DC tie relay.

 (c)  
Remove the four screws that hold the DC tie relay.

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