COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 11
Apr. 14/16
Description and Operation
23–70–04
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
within the FA2100 which is used to test the circuitry of all the audio channels. In a
successful test, the FA2100 Recorder provides a TEST INDICATOR signal which
lights the green TEST indicator mounted on the front panel of the S151/S161,
S152/S162, and S251/261 Control Units.
NOTE:
For all P/N: 2100
−
1025
−
02/
−
22/
−
24, 2100
−
1X26
−
02,
2100
−
1X27
−
02, no test tone will be heard and the Monitor
Output will be muted during the test. After the test, if the
−
Test Good
−
tone is not heard, then the 2100CVR has failed
and the test. Monitor Output will resumes in both a passed
and failed test.
NOTE:
The Model 2100
−
1X25
−
XX, when used with the S161
−
1390
−
01
Control Unit, does not have a LED test indicator present. Ho-
wever, the audible test tone is still present.
D.
Voice Data Interface Characteristics
The FA2100 CVR is used in an ARINC 557/757A configuration, with interface to the air-
craft provided through a 57-pin DPXB rear panel connector. The Reference Signal, as
required by ED-56A & ED
−
112, is defined as an input signal with a frequency of 1 kHz at
an input level of 3 Vrms for Channels 1, 2, and 3, and 2 Vrms for Channel 4. The Audio
input sensitivity level is .05 Vrms
−
3 Vrms for Channels 1, 2, and 3, and .02
−
2 Vrms for
Channel 4.
The Model FA2100 CVR provides for four audio inputs which are connected as fol-
lows:
Channel 1 – Cockpit Spare Audio Input (3rd crew member
−
CAA)
Channel 2 – Co-Pilot’s Audio, Boom, Mask, and Hand-Held Microphone Input
Channel 3 – Pilot’s Audio, Boom, Mask and Hand-Held Microphone Input
Channel 4 – Cockpit Area Microphone (CAM) Input
These audio signals are applied through the rear connector to the Aircraft Interface
PWA, then are digitally converted into 16
−
Bit words, compressed and stored in
memory. Refer to Paragraph 5 for detailed pin-outs of the rear interface connector.
In the
−
02 FSK version of the FA2100 CVR, CH 1 or CH 3 may have an FSK GMT
input applied along with the standard audio signal.
The document reference is online, please check the correspondence between the online documentation and the printed version.