1)  Put the rod in the holes of the PSU face panel to open the assembly.

 (b)  
Hold the PSU panel. 1) Push the spring clip with the rod to release the assembly.

 (c)  
Slowly lower the PSU panel assembly until the lanyard can hold the PSU.

 (d)  
Disconnect the PSU electrical connector.

 (e)  
Identify the location of the electrical wires on the speaker transformer terminals.

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A

737-300/400/500MAINTENANCE MANUAL
OVERHEAD STORAGE BIN
HOLE
HOLE
SEE A
SPEAKER SEE B
PSU (FACE VIEW) A
LANYARD 
PSU 
(REF)  TORSION 
SPRING 
PSU (LOWERED) 
TORSION 
SPRING 
PSU SPEAKER MOUNTING 
B 
PSU Loudspeaker Installation 
Figure 401 

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A 737-300/400/500MAINTENANCE MANUAL
 (f)  
Disconnect the two speaker wires from the speaker transformer terminals.

 (g)  
Move the torsion springs at the speaker (2 locations) until you can remove the speaker from the PSU assembly.

 (h)  
Carefully remove the speaker from the PSU.

 NOTE: Do not cause damage to the speaker gasket between
____ the speaker and PSU assembly.
 (i)  Release the torsion springs on the PSU.
 TASK 23-31-11-424-003
 3.  PSU Speaker Installation
________________________
 A.  General
 (1)  This task installs a PSU speaker in a PSU assembly.
 B.  Access
 (1)  Location Zones
 100 Upper Half of Fuselage

 C.  Procedure
 S 424-004
 (1)  Install the PSU Speaker:
 (a)  
Install the speaker gasket.

 (b)  
Move the torsion springs on the PSU assembly to permit the installation of the speaker.

 (c)  
Install the speaker on the PSU assembly.

 1)  Make sure the gasket is level after the speaker installation.

 (d)  
Release the torsion springs.

 1)  Make sure the torsion springs will hold the speaker in its position.

 (e)  
Connect the electrical wires to the speaker transformer terminals.

 (f)  
Connect the PSU electrical connector.

 (g)  
Push the PSU panel assembly up until it closes to the usual position.

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A 737-300/400/500MAINTENANCE MANUAL
 S 864-009
 (2) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  P6 Load Control Center - Right
 1) PASS ADDRESS AMPL BAT

 S 714-011
 (3)  Do the "PSU Speaker Installation Test" (Ref para. 4).
 TASK 23-31-11-714-006
 4.  PSU Speaker Installation Test
_____________________________
 A.  General
 (1)  This task does a test of the PSU speaker installation.
 B.  References
 (1)  24-22-00/201, Manual Control
 C.  Access
 (1)  Location Zones
 100 Upper Half of Fuselage

 D.  Procedure
 S 864-005
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 714-007

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

 (a)  
Lift the PA microphone from an attendant station holder.
　
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