(21)
Press call button at a PSU and check for a high tone.

(22)
Reset call button.

(23)
Press ATTENDANT call button at forward attendant's panel and check for a high tone followed by a low tone.

(24)
Set FASTEN BELTS switch on overhead panel P5 to ON and check for low tone in passenger cabin.

(25)
Set FASTEN BELTS switch on overhead panel P5 to OFF and check for low tone in passenger cabin.

(26)
Remove electrical power if no longer required.

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5C8 
Oct 20/89  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  23-31-0 Page 503 

PASSENGER ADDRESS LOUDSPEAKERS - REMOVAL/INSTALLATION
1.  General
A.  The passengers' loudspeakers are installed in the PSU's (passenger service units) in the passenger cabin; each attendant's loudspeaker is installed in a center ceiling panel at the attendant's station, lavatory speakers are installed in the ceiling PSU's in the lavatories. Instructions for removal and installation of PSU speakers are in par. 3 thru 5. Attendants' speakers are covered in par. 6 and lavatory speakers are covered in par. 7.
B.  After installation, the speaker should be checked using the test in par. 8.
2.  Prepare for Speaker Removal and Installation
A.  Open PA AMPLIFIER circuit breaker on P6.
3.  Removal/Installation of PSU Loudspeaker (Carry all Interiors) (Fig. 401)
A.  Remove Loudspeaker
(1)  
Insert small rod or similar device into hole near each inboard corner of PSU and push to release latch (use care not to mar PSU surface) and lower PSU until lanyard is taut.

(2)  
Identify and then detach two leads from loudspeaker.

(3)  
Unfasten speaker and remove.

(4)  
Raise PSU and check that latches are engaged.

B.  Install Loudspeaker
(1)  
Insert small rod or similar device into hole near each inboard corner of PSU and push to release latch (use care not to mar PSU surface) and lower PSU until lanyard is taut.

(2)  
Install loudspeaker with fasteners or spring clips.

(3)  
Attach speaker leads.

(4)  
Raise PSU and check that latches are engaged.

4.  Removal/Installation of PSU Loudspeaker (New Look Interiors) (Fig. 402)
A.  Remove Loudspeaker
(1)  
Release two 1/4-turn fasteners on PSU or insert small rod or similar device into hole near each inboard corner of PSU and push to release latch (use care not to mar PSU surface) and lower PSU until lanyard is taut.

(2)  
Identify and then detach two leads from loudspeaker.

(3)  
Unfasten speaker and remove.

(4)  
Raise PSU and check that latches are engaged.

B.  Install Loudspeaker
(1)  
Release two 1/4-turn fasteners on PSU or insert small rod or similar device into hole near each inboard corner of PSU and push to release latch (use care not to mar PSU surface) and lower PSU until lanyard is taut.

(2)  
Install loudspeaker with fasteners on spring clips.

(3)  
Attach speaker leads.

(4)  
Raise PSU and check that latches are engaged.

5.  Removal/Installation of PSU Loudspeaker (ATI Interior) (Fig. 403)
A.  Remove Loudspeaker
(1)  Access speaker by opening PSU Oxygen/light panel assembly:
(a)  
Insert rod into holes in PSU face panel to unlatch assembly.

(b)  
Support PSU panel, press spring clip through hole in frame.

(c)  
Lower PSU panel assembly until supported by lanyard.

5C8 
Jun 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  23-31-11 Page 401 

H42678 H34429
PSU Loudspeaker Installation (Carry-All-Interior)  557 
23-31-11  Figure 402 (Sheet 2)  Feb 15/79 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

557  PSU Loudspeaker Installation (New Look Interior) 
Feb 15/79  Figure 402  23-31-11 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

(2)  
Disconnect PSU electrical connector.

(3)  
Note location of electrical wires on speaker transformer terminals COM and 2K. Disconnect the two speaker wires from the transformer terminals.
　
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