(a)  Make sure the sound level is approximately the same as in step D. (5) (c).
 F.  Test the #2 Low Oil Pressure Switch
 NOTE: If the oil pressure switch from the #2 engine is not connected to
____
 the PA amplifier, do not do these steps.

 S 865-419
 (1)  
Remove the electrical connector from the low oil pressure switch on the #2 engine.

 S 755-420

 (2)  
Measure the sound level of the speakers:

 (a)  
Move the sound level meter across the same speaker panel.

 (b)  
Write the value down.

 1)  Make sure the value is approximately 6 dBs more than the value you measure in step D. (5) (c).
 S 865-421
 (3)  
Reconnect the electrical connector to the low oil pressure switch on the #2 engine.

 S 755-422

 (4)  
Measure the sound level across the same speakers.

 (a)  Make sure the sound level is approximately the same as in step D. (5) (c).
 G.  Put the Airplane to Its Usual Condition
 S 865-409
 (1)  
Put the Audio Selector Panels (ASP) back to the usual condition (Ref 23-51-00/501).

 (2)  
Set the noise generator PWR/PTT switch to OFF.

 S 865-424

 (3)  
Disconnect the noise generator from the microphone jack in the Flight Compartment.

 (a)  Remove the test equipment from the airplane.

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

 S 865-423
 S 865-408
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A
737-300/400/500MAINTENANCE MANUAL
 PASSENGER ADDRESS AMPLIFIER - REMOVAL/INSTALLATION
__________________________________________________
 1.  General_______
 A. This procedure contains these tasks:
 (1)  
Passenger Address Amplifier Removal

 (2)  
Passenger Address Amplifier Installation

 (3)  
Passenger Address Amplifier Test

 TASK 23-31-01-024-042
 2.  Passenger Address Amplifier Removal (Fig. 401)___________________________________
 A. General
 (1)  This task removes the PA amplifier from the E2-1 shelf in the Electronics Compartment.
 B. References
 (1)  20-10-07/201, Electrical/Electronic Black Box
 C. Access
 (1)  Location Zone
 205 Electronic Compartment

 D. Procedure
 S 864-022
 (1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Load Control Center - Right 1) PASS ADDRESS AMPL BAT
 S 024-023
 (2) Remove the Passenger Address Amplifier (Ref 20-10-07/201).
 TASK 23-31-01-424-044
 3.  Passenger Address Amplifier Installation (Fig. 401)________________________________________
 A. General
 (1)  This task installs the PA amplifier on the E2-1 shelf in the Electronic Compartment.
 B. References
 (1)  20-10-07/201, Electrical/Electronic Black Box
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A 737-300/400/500MAINTENANCE MANUAL

AIRPLANES WITH 255-5 AMPLIFIER AIRPLANES WITH 346D-2B AMPLIFIER

Passenger Address Amplifier Installation Figure 401
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A
737-300/400/500MAINTENANCE MANUAL
 C. Access
 (1)  Location Zone
　
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