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757 MAINTENANCE MANUAL
 D. Do a Test of the Control Panel Installation
 S 864-015
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 714-012

 (2)  
Do a test of the control panel, as follows:

 (a)  
Push the BAT switch on the control panel to the ON position.

 (b)  
Make sure the white light in the switch comes on.

 (c)  
Push the BAT switch on the control panel to the OFF position.

 (d)  
Make sure the white light in the switch goes off.

 (e)  
Make sure the yellow light in the switch comes on.

 S 864-013
 (3)  
Do the activation procedure for the spoilers if you did the deactivation procedure (AMM 27-61-00/201).

 S 864-014

 (4)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

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757 MAINTENANCE MANUAL
 DC METERS - DESCRIPTION AND OPERATION
_____________________________________
 1.  General_______
 A. EICAS computers measure the DC currents and voltages on the DC buses.
 2.  Operation_________
 A. Functional Description
______________________
 (1)  
EICAS computers measure the output voltages of the main and APU batteries, and the left and right transformer-rectifier units (TRU's).

 (2)  
The main battery has an external shunt installed in the ground lead. A voltage proportional to battery current is measured by the EICAS computers.

 (3)  
The APU battery charger has an external shunt installed in the ground lead. A voltage proportional to charging current is measured by the EICAS computers.

 (4)  
Each TRU has an internal shunt installed in the ground lead. A voltage proportional to TRU current is measured by the EICAS computers.

 (5)  
AIRPLANES WITH HYDRAULIC MOTOR GENERATOR; the DC output voltage of the hydraulic motor-driven generator is measured at the HYD GEN DC SENSE circuit breaker on the hydraulic generator power panel P71.

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3.

757 MAINTENANCE MANUAL
 AC EXTERNAL POWER - DESCRIPTION AND OPERATION
_____________________________________________
General
_______
 A.  AC external power can be used on the ground to supply the main AC buses, the ground handling bus, and ground service bus. System components include bus power control unit, external power panel, external power receptacle, external power contactor, and ground power current transformer.
Component Details (Fig. 1)
_________________
 A.  Bus Power Control Unit______________________
 (1)  The bus power control unit (BPCU) monitors the external power system. Protection circuits in the BPCU isolate faults and disconnect poor quality power. The BPCU shares status information with the generator and auxiliary generator control units. The BPCU controls all AC electrical buses, and controls load shedding. The BPCU is located in forward equipment center rack E5.
 B.  External Power Panel____________________
 (1)  The external power panel P30 is located on the lower right side of the fuselage, aft of the nose gear wheel well. The panel contains the external power receptacle, a white AC PWR CONNECTED light, and a clear PWR NOT IN USE light.
　
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