31-51-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
MAWEA POWER SUPPLY UNITS - REMOVAL/INSTALLATION
_______________________________________________
1. General_______
A. This procedure has two tasks. These tasks are the removal and the installation of the MAWEA power supplies.
B. There are two MAWEA power supply units. Each unit receives 115 volts AC and supplies the MAWEA chassis with +5.7 volts and |12.7 volts dc power. There are two lights, one for each power supply unit, on the MAWEA monitor panel. The lights come on when a power supply does not operate.
C. There are jacks on the MAWEA monitor panel to do a check for the +5.7V and |12.7V outputs.
TASK 31-51-01-004-001
2. MAWEA Power Supply Removal__________________________
A. References
(1) WDM 31-51-11 thru WDM 31-51-18
B. Access
(1) Location Zone 116 Area Between Nose Gear Well and Fuselage-RH
C. Procedure
S 864-002
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7, Overhead Circuit Breaker Panel
1) 7A01, MAWEA PWR A
2) 7B01, MAWEA PWR B
S 014-023
(2)
Loosen the four screws on the access door for the MAWEA power supply.
S 014-024
(3)
Remove the access door.
(4)
Loosen the wedge clamps on each side of the power supply unit.
(5)
Loosen the screw in the center of the power supply unit.
(6)
Remove the applicable power supply unit.
S 034-025
S 034-026
S 024-027
TASK 31-51-01-404-008
3. MAWEA Power Supply Installation_______________________________
A. Equipment
(1) Multimeter.
B. References
(1) WDM 31-51-11 thru WDM 31-51-18
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A
747-400
MAINTENANCE MANUAL
MAWEA CARD FILE SEE A
MAIN EQUIPMENT CENTER
MAWEA POWER SUPPLY UNIT
SEE B
MAWEA CARD FILE A
MAWEA Power Supply Installation
Figure 401 (Sheet 1)
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31-51-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E52959
A
747-400
MAINTENANCE MANUAL
(2 LOCATIONS)
MAWEA POWER SUPPLY UNIT
A-A
MAWEA Power Supply Unit Installation
Figure 401 (Sheet 2)
E50447
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31-51-01
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747-400
MAINTENANCE MANUAL
C. Access
(1) Location Zone
116 Area Between Nose Gear Well and Fuselage-RH
D. Procedure
S 424-032
(1) Install the MAWEA power supply A:
(a)
Connect one terminal of the meter to the electrostatic jack located at the bottom right corner of the MAWEA chassis.
(b)
Connect the other terminal of the meter to the "A" GND test point on the MAWEA POWER SUPPLY monitor panel located at the top center of the MAWEA chassis. 1) Make sure the meter value is greater than 10 megaohms.
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