L3 FA2100 CVR Component Maintenance Manual With Illustrated Parts List page 85

(1) Stop Recording Command
Assertion of the "Stop Recording" command stops the FA2100 CVR recording within
ten minutes. Removal of the "Stop Recording" command or "Push-To-Test" resumes
the recording. If the recording is resumed due to the "Push-To-Test" function being
activated, the recording will again cease within 10 minutes if the "Stop Recording"
signal is still active.
(2) Control Unit Operating Power and Monitor Audio Signals
The FA2100 CVR provides the control unit with +18 Vdc operating power, monitor
audio to the headset jack, and a TEST indicator signal.
Refer to Figure 4, an Audio Output channel for test monitoring provides a combina-
tion of four High Quality (for 30-minute recorders) or two Standard Quality (for
120-minute recorders and 2100−1020−XX pre MOD−DOT #7) or four High Quality
(for P/N: 2100−1X25/1X26/1X27−XX and 2100−1X20−XX MOD−DOT #7) repro-
cessed ADPCM data channels. This monitored Audio Output signal is accessible at
the front panel of the control unit via a 600-ohm headset. The monitor audio signal
has a reference input level of 2.55 Vrms into 600 ohms applied to one input channel.
In the 2100-1010-( ), 30-minute recorders, the monitored Audio Output signal to the
control unit is developed by summing together the High Quality Voice for Channels
1, 2, 3, and the Cockpit Area Microphone (CAM) Channel 4. In the 2100-1020-( )
pre MOD−DOT #7, 120-minute recorders, the Audio Output signal consists of the
same High Quality Voice and CAM channels and Test signal as found in the 30-min-
ute recorder, in addition to a Standard Quality Voice and Standard Quality CAM out-
put for up to 120 minutes. In the 2100−1X25/1X26/1X27−( ) and 2100−1X20−( )
MOD−DOT #7 the monitored audio is a combination of Channel 1 through Channel 4
High Quality audio. There are no Standard Quality audio channels in the full 2−hour
High Quality Recorder. This monitored Audio Output is the Adaptive Differential
Pulse Code Modulated (ADPCM) digital data which is reprocessed back to PCM and
converted from digital to analog audio prior to being recorded into flash memory. It
should not to be confused with the downloaded digital audio retrieved from memory
with the Portable Interface Unit, from the front panel ATE connector.
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
The document reference is online, please check the correspondence between the online documentation and the printed version.
AVIATION RECORDERS
COMPONENT MAINTENANCE MANUAL
FA2100CVR
23–70–04
Description and Operation
Rev. 15 Page 8
Apr. 14/16