C. Procedure
 S 424-005
 (1)  Install the Lavatory Speaker:
 (a)  
Hold the speaker and the cover in the correct position.

 (b)  
Install the lavatory speaker with the four screws.

 (c)  
Attach the two speaker wires to the speaker.

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A 737-300/400/500MAINTENANCE MANUAL
 (d)  Push the PSU up to engage the latches. 1) Make sure you install the PSU correctly.
 S 864-006
 (2) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6 Load Control Center - Right
 1) PASS ADDRESS AMPL BAT

 S 714-007
 (3) Do the "Lavatory Speaker Installation Test" task (Ref para. 4).
 TASK 23-31-13-714-008
 4.  Lavatory Speaker Installation Test
__________________________________
 A.  General
 (1) This task does a test of the installed lavatory speaker.
 B.  References
 (1)  24-22-00/201, Manual Control
 C.  Access
 (1)  Location Zones
 100 Upper Half of Fuselage

 D.  Procedure
 S 714-009
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 714-010

 (2)  
Do a Test of the Lavatory Speaker Operation:

 (a)  
At an attendant station, lift the PA microphone from the holder.

 (b)  
Push the PTT button on the microphone.

 (c)  
Make an announcement on the PA system.

 1)  Make sure you can hear the announcement on the installed lavatory speaker.

 (d)  
Put the microphone back in the holder.

 (3)  
Remove electrical power if it is not necessary (Ref 24-22-00/201).

 S 864-012
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A
737-300/400/500MAINTENANCE MANUAL
 BOARDING MUSIC TAPE REPRODUCER - MAINTENANCE PRACTICES
______________________________________________________
 1.  General
_______
 A.  This subject has two tasks, one for the replacement of the tape and one to clean the tape track in the tape reproducer.
 TASK 23-31-21-902-063
 2.  AIRPLANES WITH TAPE REPRODUCERS IN THE EE BAY; Tape Replacement
________________
 A.  General
 (1)  The source tape can not be replaced on the flight line, the tape has to be replaced in a maintenance facility shop.
 TASK 23-31-21-902-072
 3.  AIRPLANES WITH TAPE REPRODUCERS IN THE LAVATORY WALL; Tape Replacement
________________
 A.  General
 (1)  This procedure replaces the source program tape in the tape reproducer.
 B.  References
 (1)  AMM 24-22-00/201, Manual Control
 C.  Access
 (1)  Location Zone
 103 Forward Lavatory

 D.  Tape Replacement.
 S 862-074
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 962-075

 (2)  
Replace the source program tape:

 (a)  
Push the 2 number code (90) on the keyboard.

 (b)  
Push the MUSIC 1 button to open the tape cassette door.

 (c)  
Remove the tape cassette.

 (d)  
Install the replacement tape cassette in the tape reproducer.

 1)  Make sure the tape cassette is against the tape reproducer head.
 NOTE: The tape is correctly installed when you see the
____
 label.

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