(3)  
The system also provides speedbrake warning.

 (4)  
Two fault balls monitor operation of the two power supplies. A reset switch is provided to return tripped fault balls to their operational mode.

 (5)  
The modules located in the WEU and their functions are as follows:

 (a)  Power Supply Modules
 1)  The two redundant power supplies receive 115 volts ac power and develop the +5 volts and |12 volts dc power required for all warning modules. There are two ball type fault indicators, one for each module. Each ball latches to black when the corresponding power supply is operating properly and latches to yellow when a fault occurs. The RESET switch next to the fault indicator is provided to set the fault balls back to the operational mode.
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MAINTENANCE MANUAL

LEFT (RIGHT)DISCRETE CAPTAIN'S (FIRST OFFICER'S) AURAL WARNING
WARNING
WARNING MASTER WARNING LIGHTS LOUDSPEAKERS
MISCELLANEOUS  rDISPLAY
SEE A  TEST PANELMODULE
CAUTION
SEED  aSEE B
CAPTAIN'S (FIRST OFFICER'S) MASTER WARNING AND CAUTION LIGHTED SWITCH (P7)
A  CONFIGURATION WARNING LIGHT
SPEED BRAKES FIRE
CONFIG CAUTION LIGHT r
r
A/P
PULL UP r DISC r
P10 PANEL GND PROX/CONFIG SPEED CABIN
SEE E OVSPD
GEAR OVRD SWITCH  BRAKES ALT
r ra
SEE C
DISCRETE WARNING DISPLAY MODULE FLIGHT COMPARTMENT
B
CONFIGURATION GND PROX/CONFIG WARNING TEST
GEAR OVRD
SWITCH
TEST CONFIG T/O
OVRD
a
LDG
GND PROX/CONFIG GEAR OVRD SWITCH
NOTE:
C
REMOVE SIDE
PANEL FOR ACCESS
MISCELLANEOUS TEST PANEL
SPEED BRAKE HANDLE POSITION SWITCH
D
SEE F
INBD SPEED BRAKE HANDLE POSITION P10 PANEL SWITCH
FWD
E
FWD
SPEED BRAKE HANDLE POSITION SWITCH F Warning System - Component Location Figure 1 (Sheet 1)
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SEE

WEU BITE MODULE WARNING ELECTRONICS UNIT, P51

G F
Warning System - Component Location Figure 1 (Sheet 2)
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(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)

757 MAINTENANCE MANUAL
EMI Filter Module
 1)  There are two EMI filter modules in the WEU. Each filter module is paired with a power supply module. The EMI filter module connects to the power line and filters the AC line noise.
　
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