D. Procedure
 S 424-024
 (1)
Install the Passenger Address Amplifier (Ref 20-10-07/201).

 S 864-021

 (2)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P6 Load Control Center - Right
 1) PASS ADDRESS AMPL BAT

 S 714-047
 (3) Do the "Passenger Address Amplifier Test" (Ref para. 4).
 TASK 23-31-01-714-020
 4.  Passenger Address Amplifier Test________________________________
 A. General
 (1)  This task does a test of the PA amplifier after installation.
 B. References
 (1)  24-22-00/201, Manual Control
 C. Access
 (1)  Location Zones
 100 Upper Half of Fuselage
 205 Electronic Compartment

 D. Procedure
 S 864-044
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 714-046

 (2)  
Do a Test of the PA Amplifier Operation:

 (a)  AIRPLANES WITH A 346D-2B AMPLIFIER; Put the TEST/NORM/CAL switch in the CAL position. 1) Make sure that the -1 and 0 db LEDs come on.
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 2)  If the -1 and the 0 db LEDs do not come on, adjust the MASTER GAIN potentiometer until the -1 and 0 db LEDs come on.
 NOTE: The MASTER GAIN control potentiometer can be
____ found below the handle on the front panel of the amplifier.
 (b)  
Put the TEST/NORM/CAL switch to the TEST position.

 1)  Make sure you can hear a high chime sound on the passenger address speakers.

 (c)  
Put the TEST/NORM/CAL switch back to the NORM position.

 (d)  
AIRPLANES WITH A 255-5 AMPLIFIER; Put the NORM/CAL switch to the CAL position. 1) Make sure the meter shows 0 db. 2) If the meter does not show 0 db, adjust the MASTER GAIN

 control potentiometer until the meter shows 0 db.
 NOTE: The MASTER GAIN control potentiometer can be found
____ below the handle on the front panel of the amplifier.
 (e)  
Put the NORM/CAL switch back to the NORM position.

 (f)  
Put the NORM/SPKR TEST switch to the SPKR TEST position.

 1)  Make sure you can hear a high chime sound on the passenger address speakers.

 (g)  
Put the NORM/SPKR TEST switch back to the NORM position.

 S 864-043
 (3)  Remove electrical power if it is not necessary (AMM 24-22-00/201).
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 PASSENGER SERVICE UNIT SPEAKER - REMOVAL/INSTALLATION
_____________________________________________________
 1.  General_______
 A.  This procedure has three tasks. The first task is the removal of a passenger service unit (PSU) speaker. The second task is the installation of a PSU speaker. The third task is a installation test of a PSU speaker.
 B.  PSUs have speakers installed as necessary to supply equal sound in the passenger compartment.
 TASK 23-31-11-004-001
 2.  PSU Speaker Removal___________________
 A.  General
 (1)  This task removes a PSU speaker from the passenger service unit (PSU).
 B.  Access
 (1)  Location Zones
 100 Upper Half of Fuselage

 C.  Standard Tools and Equipment
 (1) Rod - 0.10 inch dia. max. x 3.0 inches (commercially available)
 D.  Procedure
 S 864-008
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Load Control Center - Right
 1) PASS ADDRESS AMPL BAT

 S 024-002
 (2)  Remove the PSU Speaker:
 (a)  
Open the passenger service unit (PSU).
　
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