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757 
MAINTENANCE MANUAL
 (b)  Make sure the bottom EICAS display is in the ECS MSG mode.
 Push the ECS MSG switch on the EICAS MAINT panel on the right
 side panel P61, if necessary.
 (c)  Make sure the EICAS message, T-R UNIT, does not show on the
 bottom display.
 (d)  Push the ELEC HYD switch on the EICAS MAINT panel.
 (e)  Make sure these values are below L and R on the bottom EICAS
 display:
 1) DC-V = 28 |5
 2) DC-A = larger than 5
 (f)  Open this circuit breaker:
 1) 6C23 or 32EE2, R TRU
 (g)  Make sure these values are below R on the bottom EICAS display
 for 11 |5 seconds:
 1) DC-V = 0 |1
 2) DC-A = 0
 (h)  After 11 |5 seconds make sure these values are below R on the
 bottom EICAS display:
 1) DC-V = 28 |5
 2) DC-A = 0
 (i)  Push the ECS MSG switch on the P61 panel.
 (j)  Make sure the EICAS message, T-R UNIT, shows on the bottom
 display.
 (k)  Close this circuit breaker:
 1) 6C23 OR 32EE2, R TRU
 (l)  Make sure the EICAS message, T-R UNIT, still shows on the
 bottom display.
 (m)  Push the left BUS TIE switch on the P5 panel to the ISLN
 position (out position).
 (n)  Make sure the amber ISLN light in the switch comes on.
 (o)  After 3 seconds (minimum), push the left BUS TIE switch on the
 P5 panel to the AUTO position.
 (p)  Make sure the ISLN light in the switch goes off.
 (q)  Make sure the EICAS message, T-R UNIT, does not show on the
 bottom display.

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757 MAINTENANCE MANUAL
 (r)  
Push the ELEC HYD switch on the EICAS MAINT panel.

 (s)  
Open this circuit breaker:
 1) 6C17 OR 31EE2, L TRU

 (t)  
Make sure these values are below L on the bottom EICAS display: 1) DC-V = 0 |1 2) DC-A = 0

 (u)  
After 11 |5 seconds, make sure these values are below L on the bottom EICAS display: 1) DC-V = 28 |5 2) DC-A = 0

 (v)  
Push the ECS MSG switch on the EICAS MAINT panel.

 (w)  
Make sure the EICAS message, T-R UNIT, shows on the bottom display.

 (x)  
Close this circuit breaker:
 1) 6C17 OR 31EE2, L TRU

 (y)  
Make sure the EICAS message, T-R UNIT, still shows on the bottom display.

 (z)  
Push the left BUS TIE switch on the P5 panel to the ISLN

 position (out position).
 (aa) Make sure the amber ISLN light in the switch comes on.
 (ab) After 3 seconds (minimum), push the left BUS TIE switch on the
 P5 panel to the AUTO position.
 (ac) Make sure the ISLN light in the switch goes out.
 (ad) Make sure the EICAS message, T-R UNIT, does not show on the
 bottom display.
 C. Put the Airplane Back To Its Usual Condition
 S 445-137
 (1)  
Do the activation procedure for the spoilers if you did the
 deactivation procedure (AMM 27-61-00/201).

 (2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 865-138
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757 MAINTENANCE MANUAL
 BATTERIES - DESCRIPTION AND OPERATION
_____________________________________
 1.  General_______
 A.  The battery system is composed of the main battery system and the APU battery system. System components include batteries, battery chargers, battery shunts, a battery current monitor, main battery charger disable relay, APU battery charger interlock relay, main battery relay, main battery transfer relay, DC under voltage sensing relay, main battery charger detection relay, and main/APU battery charger detection enable relay.
　
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