C.  Procedure
 S 715-026
 (1)  Do this task "Input Systems Test" (AMM 31-51-00/501).
 NOTE: This task will make sure all the airplane systems that
____ control the automatic mode of the passenger signs are operational.
 NOTE: The operational test for the automatic mode of the
____ passenger signs simulates an ON command from the (Modularized Avionics Warning Electronics Assembly) (MAWEA).
 S 865-030
 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 715-025

 (3)  
Do these steps to do the operational test:

 (a)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 1)  P7 Circuit Breaker Panel
 a) 7A01 MAWEA PWR A
 b) 7B01 MAWEA PWR B

 (b)  
Disconnect the connector (DW3403A) from the M7952 (MAWEA) module.

 (c)  
At the control stand, P8, set the switches for the NO SMOKING and FASTEN SEAT BELT signs to the automatic position. 1) Make sure the NO SMOKING, FASTEN SEAT BELT, and RETURN TO

 SEAT signs are off.

 (d)  
Connect a ground to pin A6 of the connector that you removed from the M7952 module. 1) Make sure all the NO SMOKING signs come on. 2) Make sure all the FASTEN SEAT BELT and the RETURN TO SEAT

 signs are off. 3) Make sure you hear a chime in the passenger cabin.

 (e)  
Remove the ground from pin A6 of the connector.

 (f)  
Connect a ground to pin A7 of the connector you removed from the M7952 module. 1) Make sure all the NO SMOKING signs go off. 2) Make sure all the FASTEN SEAT BELT and RETURN TO SEAT signs

 come on. 3) Make sure you hear a chime in the passenger cabin.

 (g)  
Remove the ground from pin A7 on the connector.

 (h)  
Connect the connector (DW3403A) to the M7952 (MAWEA) module.

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

 S 865-031
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A
747-400 MAINTENANCE MANUAL
 PASSENGER INFORMATION SIGNS - MAINTENANCE PRACTICES
___________________________________________________
 1.  General
_______
 A.  This procedure contains these tasks:
 (1) A task for the replacement of the lamps in the billboard sign.
 B.  The Passenger Information Signs get their power from the P414 Panel Power Distribution Center - L.
 (1)  
Open the applicable circuit breakers on the P414 panel to remove power from the Passenger Information Signs.

 (2)  
Control of the signs is by the NO SMOKING and the SEATBELTS switches on the P8 panel.

 NOTE: Close the lavatory door to control the lavatory OCCUPIED
____
 section of the sign.

 TASK 33-24-02-962-001
 2.  Billboard Sign Lamp Replacement
_______________________________
 A.  References
 (1)  AMM 24-22-00/201 Manual Control
 B.  Access
 (1)  Location Zone
 200 Upper Deck Passenger Compartment
 200 Flight Deck, Pilots Instrument Panel

 C.  Replacement Procedure
 S 862-002
 (1)  Prepare for the lamp replacement:
 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Put the NO SMOKING switch on the P8 panel to ON.

 (c)  
Put the SEATBELTS switch on the P8 panel to ON.

 (d)  
Close the lavatory doors for the applicable sign.

 (e)  
Identify the defective lamps.

 (f)  
Put the NO SMOKING switch on the P8 panel to OFF.

 (g)  
Put the SEATBELTS switch on the P8 panel to OFF.

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