(STA 78)
SERVICE
M545D4155
D125B
28V DC
F/O BAT INPH 21 9 MICROPHONEBUS 2
24-00-01 C56023 AUDIO
TD6057INTPH PWR
RRIGHT WHEEL WELL
M544 S
F/O NO. 2 BUS
(STA 665)AUDIO INTEGRATINGP6-2 CIRCUIT BREAKER PANEL
48
SHELF (E2-1)
50
ATTENDANT/SERVICECODE
31 R3
INTERPHONE STATIONS TYPE 40 TD6011A EXTERNAL POWER PANEL JACK49
51
R LEFT WHEEL WELL
SVC/ATT
S
B
(STA 665)
LEVEL
ELECTRONIC EQUIPMENT RACKJACK
39
R2
ATT INTPH
C WING REFUELING STATIONJACK
30 LEVEL
D FORWARD OF RIGHT WHEEL WELLJACK
M69 AUDIO ACCESSORY UNIT (E2-1)
TD6017
F
E FORWARD OF LEFT WHEEL WELL JACKR
AFT CABIN CEILINGJACKSERVICE
APUINTERPHONE
S
G
(STA 1040)
OFF
H
APU ACCESS PANELJACKFORWARD ATTENDANT'S PANEL HANDSETJ AFT ATTENDANT'S PANELHANDSET
NC 2
K CAPTAIN'S AUDIO SELECTOR PANEL
INTERPHONE 1
ON
T D6015
R
L FIRST OFFICER'S AUDIO SELECTOR PANEL INTERPHONE AFT CABIN
S50 SERVICE INTERPHONE
S
M
(STA 1004)
OBSERVER'S AUDIO SELECTOR PANEL INTERPHONE SWITCH (P5 AFT)
D6025R
TT
R ELECTRONIC
S
S
C
EQUIPMENT RACK
R2
D6021
(STA 350)
R3
P13 FORWARD
ATTENDANTS PANEL
A
LM
D F
B
TD6007
E J
K H
RSERVICE
G
T
S
INTERPHONES D6023P19 EXTERNAL POWER
RECEPTACLE PANELP14 AFTATTENDANTS PANEL
R
T
R
MF
S
G
KL
D6019
J
H
A
DE
B
P8 CONTROL STAND-AFT
FACE
Service Interphone System Schematic
Figure 3 (Sheet 1)
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23-41-00
ú ú 02 Page 5 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH REMOTE ELECTRONICS UNIT ú
23-41-00
ú ú 02 Page 6 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
5. Operation (Fig. 3)
_________
A. Functional Description
(1)
The SERV INPH AMPLIFIER (airplanes with AAUs) or the INTPH AND WARNING (airplanes with REUs) circuit breaker on load control center P6 controls power to the system. The system is on whenever power is provided to one of the buses.
(2)
Setting the service interphone switch (on the aft overhead panel P5) to ON connects the microphone circuits from the external service interphone jacks to the interphone amplifier. This allows ground crew at the various maintenance locations to talk with each other.
(3)
Attendants may communicate with each other, with the flight crew, and with the ground crew, by using the handsets installed at their stations.
(4)
The flight crew can communicate with the attendants and with crew at maintenance locations by pushing the ATTEND call switch and SERV INT audio listen switch on the pilots' overhead panel P5. On airplanes with digital control systems the service interphone switch may be on the audio selector panel.
(5)
On airplanes with AUDIO ACCESSORY UNIT, potentiometers on the front of the AAU are used to adjust amplifier gain and the attendants handset receiver audio to a comfortable listening level.
(6)
On airplanes with REMOTE ELECTRONIC UNIT, adjustment for gain is with the audio control knobs on the audio selector panel.
(7)
No stowage is provided for handsets at the switched service interphone jacks and the control stand jack. Therefore, to do maintenance, handsets must be furnished by ground crew personnel.
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