COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Page 9
Nov. 01/98
Description and Operation
23–70–04
The Push-To-Test signal is activated when the TEST pushbutton on the associated
control unit is pressed. During this time, a 620 Hz to 660 Hz signal is generated
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: 2100−1025−02/2100−1026−02/2100−1027−02, 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 2100−1025−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.
May 21/1
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