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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B.  A handheld microphone provides a PTT signal to input No. 2 of the PA amplifier.
 C.  AIRPLANES WITH A TAPE REPRODUCER ON THE E2-1 SHELF; The forward attendant panel contains a MUSIC OFF switch that adjust the volume and turns on the boarding music from the tape reproducer.
 6.  Attendant PA Microphones________________________
 A.  Attendant microphones are located in the passenger cabin at the attendant stations. All microphones are identical. A push-to-talk switch on the microphone must be pressed to complete microphone audio and control circuits to the PA system. Each microphone is equipped with a plug connector so that it may be easily replaced or used at another station having a PA microphone receptacle.
 7.  Audio Accessory Unit____________________
 A.  AIRPLANES WITH AN AUDIO ACCESSORY UNIT; The audio accessory unit contains the relays for speaker muting of the appropriate speakers relative to the forward or aft attendant microphones used to key the PA system.
 8.  Remote Electronics Unit_______________________
 A.  AIRPLANES WITH A REMOTE ELECTRONIC UNIT;
 Refer to the data that follows:

 (1)  
The remote electronics unit contains the relays for speaker muting of the appropriate speakers relative to the fwd or aft attendant microphones used to key the PA system.

 (2)  
The Remote Electronics Unit is also used in the Flight Interphone System, and the Cabin Interphone System. The R/I procedure is found in the Flight Interphone System manual (AMM 23-51-11/401).

 9.  Microphone Jack_______________
 A.  A microphone jack is located at the rear of the aft pilots' control stand P8. A hand-held microphone connected to this jack can be utilized for PA voice announcements.
 10. Operation (Fig. 2)_________
 A.  The PA system supplies voice messages and chime signals via speakers to all passengers and attendants in the passenger cabin.
 B.  The PA system also supplies boarding music via the speakers to the passenger cabin.
 C.  AIRPLANES WITH A WALL-MOUNTED TAPE REPRODUCER; The PA system also supplies prerecorded announcements to the passenger cabin.
 D.  PA sidetone is provided to the flight deck crewmembers via their audio selector panels.
 E.  PA inputs have an order of priority, when the PA receives an input it will cancel any input with a lower priority.
 F.  The PA input priority is as follows:
 (1)  Announcements from the flight compartment have the highest priority.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
D121
BAT. BUS

28V DC 8
POWER
24-00-01

D147D125APASS ADDRESS
C82SUPPLY
7
1514AMPL BAT
AUDIO
COMPRESSOR 16 15
F
P6-1 CIRCUIT BREAKER PANEL(SH 3)27
16 D6001
MIC HI
MIC LO

3142 M69 AUDIO ACCESS
PTT
1DC MASTER UNIT OR
DC COMM
2
CONTROL 1
GAIN
M1353 REMOTE ELECT.PA MIC
TO AUDIO SELECTOR
SIDETONED121UNIT (E2-1)
12PANEL
(PROVISIONS) P8  PILOTS CONTROL
STAND - AFT

E 3 20
CONTROL 2
T251C(SH 3) 14222
1 TO AUDIO
CONTROL 3SELECTOR
M73 FWD LEFTPANELS CAL
LAV SPKRTONE T251ACONTROL 4
2NORMAL1
A6POWER
(SH 3) METER M67 AFT LEFT
D6003SPKR
MIC HI
MIC LO

34LAV SPKR
TEST 45
PTT
AUX
1
DC COMM
GAIN T251B
228
PA MIC
2B
MUSIC AUDIO 25 NORMAL DC
INPUT 4
P13 FORWARD ATTD 1
(SH 3)
(SH 3) 26
PANEL AFT RIGHTLAV SPKR
D147 D6005
MIC HI
D147
3
PTT 33-25-11SEAT BELTSLO

MIC LO  NO SMOKING LO
4  1013CHIME
1  C8
DC COMM PASS./LAV CALL HI
2 33-27-11 7
GENERATOR23-42-01
(SH 3) ATTD CALL HI/LO
PA MIC 9P14 AFT ATTENDANT
HI
HI/ LO TEST
PSU SPEAKERPANEL
17(TYPICAL)
LO TONE 18(SH 3)
20DC 14 21 79-34-11
D752
1

P
2

78-00-00 78-34-11
D125A D125AD121
3 34

13
25 S124ENGINE 1 LOW M69 AUDIOOIL PRESSURE SW ACCESS. UNITM63 PASSENGER ADDRESS AMPLIFIER (E2-1) (255-5 AMP)
　
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