1EFF : ALL 1 22-83-34Page 411 1 1 Aug 01/05 1 1 1CES 1 Make sure that the P/N shown on the LRU IDENTIFICATION page is the same as the computer P/N (given on the front face).

 NOTE : If the P/N is not the same, you must remove the computer and
____
 return it to the shop.

 5. Close-up
________ Subtask 22-83-34-410-050
 A. Close Access
 (1)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (2)
 Close the access door 824, (Ref. TASK 52-41-00-410-002).

 (3)
 Remove the access platform(s).

 ELECTRICAL POWER SUPPLY (FMGS) - DESCRIPTION AND OPERATION
__________________________________________________________
 1.
 Location of Circuit Breakers

____________________________ The circuit breakers associated with the FMGS circuits are located on the overhead C/B panel (49VU) and the rear C/B panel (121VU) (Ref 22-00-00 for A/C General Power Supply).

 2.
 System Description

__________________
 A. Power Supply of FMGCs
 (Ref. Fig. 001)

 (1)
 28VDC Power Supply
 The FMGCs are supplied with 28VDC.

 (2)
 Miscellaneous In addition to the 28VDC power supply, the following signals are fed to the FMGCs:

 -chassis ground,
 -side 1 signals (C and M) wired to the ground on the FMGC1 only (priority).
 B. Power Supply of FCU
 (Ref. Fig. 002)

 (1)
 28VDC Power Supply The FCU is supplied with 28VDC. The chassis ground of the FCU is connected to the aircraft ground.

 (2)
 Lighting
 The FCU is supplied with three lighting power supplies:

 (a)
 Lighting voltages for engaged modes.

 -The 5VAC/3VAC variable voltage is controlled by means of the INT LT/ANN LT switch located on the overhead panel (Ref. 33-14-00).
 -At system or mode engagement, this voltage enables the illumination of the green indication on the corresponding pushbutton switch.

 (b)
 FCU lighting voltage

 -The 5VAC/3VAC variable voltage is controlled by means of a potentiometer located under the FCU (Ref. 33-13-00).
 -This voltage enables the illumination of the front panel of the FCU.
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 Power Supply of FMGCs
 Figure 001
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 Power Supply of FCU
 Figure 002
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 (c)
 Integral lighting voltage

 -The 5VAC/3VAC variable voltage is controlled by means of a potentiometer located under the FCU (Ref. 33-13-00). Considering the dissipated power, this voltage is delivered to the FCU in two steps
 -This voltage is used for LCD and placard lighting.

 (d)
 Lamp test A lamp test signal can be fed to the FCU by means of the INT LT/ANN LT switch on the overhead panel (Ref. 33-14-00). During the test, this signal activates the lighting of the LCD "engaged mode" indications and placards.

 C. Side Stick and Rudder Pedals Locking Circuits The aircraft 28VDC is delivered through relays controlled by the FMGCs to:
 -
the Captain and First Officer side-stick locking solenoids,

 -
the artificial feel stiffening solenoids (Ref. 22-11-00, Para. 2).

 **ON A/C 001-049, 051-061, 101-105,
 D. Power Supply of MCDUs and Carry on Data Loader
 (Ref. Fig. 003)

R **ON A/C 062-099, 106-149, 151-199, 201-299, 301-399, 401-499,
 D. Power Supply of MCDUs
 (Ref. Fig. 003A)

 **ON A/C ALL
 (1)
 115VAC Power Supply The MCDUs are supplied with 115VAC/400Hz. The connectors associated with the data loader are supplied with the same 115V as the MCDUs.

 (2)
 Lighting Voltages Each MCDU is supplied with two types of lighting voltages.

 (a) Annunciator lighting The 5VAC/3VAC voltage is controlled by means of the INT LT/ANN LT switch located on the overhead panel (Ref. 33-14-00).
 1EFF : ALL 1 22-84-00Page 4 1 1 Aug 01/05 1 1 1CES 1

 MCDUs and Data Loader - Power Supply
 Figure 003

 MCDUs - Power Supply
 Figure 003A

 (b)
 Integral lighting The 5VAC/3VAC variable voltage is controlled by means of the potentiometer associated with the center pedestal and instrument panel lighting (Ref. 33-13-00).
　
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