L3 FA5000 Component Maintenance Manual With Illustrated Parts List page 61

12 CESSATION OF
RECORDING
13 SPARE
14 SPARE
15 CHANNEL 2 INPUT LOW
16 CHANNEL 2 INPUT HIGH
17 CVR MAINTENANCE
FAULT
18 FDR MAINTENANCE
FAULT
19 FDR STATUS
20 CHASSIS GND
21 SPARE
22 SPARE
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AVIATION RECORDERS
COMPONENT MAINTENANCE MANUAL
Model FA5000
IN Ground logic applied to this pin (or loss of aircraft
power, whichever occurs first) activates a CV/FDR
internal timer that stops the recorder from record­
ing after 10 minutes. Removal of the ground logic
when the recorder is powered will cause the re­
corder to begin recording within 250 ms. Informa­
tion recorded prior to the cessation of recording is
preserved.
ARINC 757­4. Shunt discrete input; ARINC 573
compliant.
GND = STOP ALL RECORDING (WITHIN 10
MIN.)
OPEN = START ALL RECORDING
IN Channel 2 audio differential input signal low; 150
Hz to 3.5 kHz bandwidth, 3V RMS maximum. Im­
pedance 5K ohm minimum.
IN Channel 2 audio differential input signal high; 150
Hz to 3.5 kHz bandwidth, 3V RMS maximum. Im­
pedance 5K ohm minimum.
OUT BITE status output of the voice recording section.
Shunt discrete output at standard ground indicates
correct CVR operational status. Functional and
signal characteristics are ARINC 757 compliant.
Open drain circuit sinks 100 milliamps maximum
with less than 0.5 volts out.
GND = NO CVR FAULT
OPEN = CVR FAULT (BITE status failure, CVR
not installed, or CVR not powered)
OUT BITE status output of the data recording section.
Shunt discrete output at standard ground indicates
correct FDR operational status. Functional and
signal characteristics are ARINC 757 compliant.
Open drain circuit sinks 100 milliamps maximum
with less than 0.5 volts out.
GND = NO FDR FAULT
OPEN = FDR FAULT (BITE status failure, FDR
not installed, or FDR not powered)
OUT Status output of the FDR system. Shunt discrete
OPEN/GND relay output. Standard ground indic­
ates an FDR non­operational status.
GND = FAULT/NO POWER
OPEN = STATUS GOOD
­ Chassis ground galvanically isolated from signal
and power returns.
­ ­
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23–70−40
Description and Operation
Initital Issue Page 19
Sep. 30/11