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A 737-300/400/500MAINTENANCE MANUAL
HEADSET 
JACK 
AFT CARGO 
DOOR 
VOICE RECORDER
UNDERWATER 
SEE  A  LOCATOR 
BEACON 
(ULB) 

UNDERWATER LOCATING DEVICE  LOCATING UNDERWATER (ULD) DEVICE 
SOLID STATE VOICE RECORDER 
A 
OVERHEAD PANEL P5 
SEE  B 
LOAD CONTROL CENTER P6 

TEST
1
MONITOR
600 OHMS

2
TEST SWITCHES
3
4
ALL
MODIFICATIONS
FAIRCHILD VOICE RECORDER MODEL A100
A
FAIRCHILD VOICE RECORDER MODEL A100A
A
TEST ERASE
HEADSET 600 OHMS COCKPIT VOICE RECORDER
CONTROL UNIT
B
Voice Recorder System - Component Location
Figure 1

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F13468
A 737-300/400/500MAINTENANCE MANUAL
 E.  AIRPLANES WITH LORAL/FAIRCHILD SOLID STATE VOICE RECORDER; Bulk erasure requires the ERASE switch be pushed a minimum of 2 seconds when the airplane is on the ground with the parking brake set. When the ERASE switch is released after being pushed for 2 seconds, the header data is removed so the data can not be read and a modulated sound is heard in the headset for 13 seconds.
 F.  An Underwater Locating Beacon (ULB) that is not part of the voice recorder system is installed on the front panel of the voice recorder. The ULB is an acoustic beacon that energizes when it is immersed in water, thereby assisting to locate the recorder in case of an accident over the ocean or other body of water. Three types of ULB are in service. One type (the N15F210B) is powered by a replaceable battery. The second type (DK100) is powered by a replaceable battery, but must be returned to the vendor for battery replacement or for disposal. The third type (Datasonics ELP-362) is powered by a replaceable battery.
 G.  Operating power for the voice recorder system is 115 volts, 400 Hz AC obtained from the unswitched electronics bus through the VOICE RECORDER circuit breaker on the P18 panel.
 2.  Voice Recorder Control Panel (Fig. 2)
____________________________
115V AC ELEX BUS-1
FLIGHT COMPARTMENT AREA SOUND

Voice Recorder System Block Diagram
Figure 2

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A
737-300/400/500MAINTENANCE MANUAL
 A.  The voice recorder control panel is located in the pilots' overhead panel P5. It contains a microphone and preamplifier, a meter, a test pushbutton, a headphone jack, and an erase pushbutton. The microphone and the preamplifier pick up the conversation in the flight compartment and supply audio to channel four of the voice recorder. When the TEST pushbutton is pushed, it activates a test circuit in the recorder. If all channels are recording properly, the meter needle indicates in the green area and a 600-Hz test tone is supplied to the HEADSET jack. Push the ERASE pushbutton for a minimum of 2 seconds will erase either the entire tape for the tape recorder or the memory contents for the solid state recorder. However, the bulk erase circuit will operate only with the airplane on the ground, power applied to the airplane, and the parking brake set.
 3.  Voice Recorder Unit___________________
 A.  The voice recorder is installed in the aft cargo compartment on the right side of the airplane. It is housed in a thermally insulated, impact resistant, 1/2 ATR short case. All electrical connections are made through a single multipin connector at the rear of the unit.
 (1)  
AIRPLANES WITH LORAL/FAIRCHILD TAPE BASED VOICE RECORDER; The voice recorder contains a tape transport, a 65-kHz bias generator, four recording amplifiers, a monitoring amplifier, a test module, a power supply and a monitor jack. In addition to the tape drive mechanism and tape, the tape transport contains the recording heads, the erase head, the monitor head, and the bulk erase coil. A monitor jack is located on the front panel of the recorder. A600 Hz modulated tone is supplied to the monitor jack while the TEST pushbutton on the voice recorder control panel is pushed.
　
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