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747-400 MAINTENANCE MANUAL
 (b)  The discrete signals are routed to discrete input interfaces. The information is then applied to analog to digital converters. These digital discretes and any ARINC 429 inputs are sent to the EIUs by an ARINC 429 transmitter.
 B. Reset and Power Up BITE
 (1)  
When power is first applied, each power supply provides reset pulses to each card.

 (a)  
Reset of the microprocessors

 (b)  
Power up BITE

 (2)  
Power Up BITE

 (a)  A power up BITE tests the card circuitry except for the output drivers and input receivers.

 (3)  
Full BITE

 (a)  
The proximity switch electronic unit (PSEU) provides air/ground status information. The air data computers (ADCs) provide airspeed information. A full BITE is enabled only if these three conditions are sent to the master monitor cards: 1) Air/Gnd = Gnd 2) Landing gear is down and locked 3) Airspeed = 0

 (b)  
A discrete is sent from both master monitor cards to other MAWEA cards so that they can perform their own full BITE.

 (c)  
During a full BITE both the red and yellow LEDs turn on to assure proper operation of the LEDs. If no fault is detected, the LEDs will go out after approximately 20 seconds. If a fault is detected, the appropriate LED will remain on.

 (d)  
A full BITE tests the cards circuitry including the output drivers and input receivers.

 (4)  
If an internal fault is detected, the red CARD FAULT LED will turn on. If an input fault is detected, the yellow INTERFACE FAULT LED will turn on. If both an internal and an input fault is detected, then only the red CARD FAULT LED turns on.

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747-400
MAINTENANCE MANUAL

MAWEA Printed Circuit Cards Characteristics
Figure 6

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747-400 FAULT ISOLATION/MAINT MANUAL
MAWEA
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  AMM REFERENCE 
FIRE DETECTION, M826CARD FILE - (FIM 26-11-00/101) 
CARD FILE - MAWEA, M7952  -- 1  117AL, MAIN EQUIP CTR  * 
STALL WARNING MANAGEMENT RIGHT, YMXA10 STALL WARNING MANAGEMENT LEFT, YMXA05 SIGNAL COLLECTION/ID 2, YMXA14 MASTER MONITOR B, YMXA11 DIGITAL FLT DATA RECORDER, YMXA18 CONFIGURATION WARNING, YMXA13 AURAL SYNTHESIZER RIGHT, YMXA12 AURAL SYNTHESIZER, LEFT, YMXAO6 AIRPLANE TAIL ID, YMXA17 CREW ALERTING, YMX0A07 SIGNAL COLLECTION/ID 1, YMXA01 MASTER MONITOR A, YMXA03 CARD - MAWEA  -- 1  117AL, MAIN EQUIP CTR  31-51-02
CIRCUIT BREAKER - -- FLT COMPT, P7 
AURAL WARN SPEAKER L, C10297 1  7A3 * 
AURAL WARN SPEAKER R, C10298 1  7A4  * 
MAWEA PWR A, C10295 1  7A1  * 
SELCAL, B20 CABIN INTERPHONE, B7445 MAWEA PWR B, C10296 CONTROLLER - (FIM 23-42-00/101) DECODER - (FIM 23-21-00/101) C FLIGHT CONTROL, B7078 L FLIGHT CONTROL, B7077 R FLIGHT CONTROL, B7079 COMPUTER - (FIM 22-10-00/101) AIR DATA C, B166 AIR DATA L, B163 AIR DATA R, B164 COMPUTER - (FIM 34-12-00/101) GROUND PROX, X85 COMPUTER - (FIM 34-46-00/101) L FLIGHT MANAGEMENT, M7442 R FLIGHT MANAGEMENT, M7443 COMPUTER - (FIM 34-61-00/101) L CENTRAL MAINTENANCE, M7373 R CENTRAL MAINTENANCE, M7373 COMPUTER - (FIM 45-10-00/101) 1  7B1  * 

* SEE THE WDM EQUIPMENT LIST
MAWEA - Component Index
Figure 101 (Sheet 1)

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