COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 36
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.
Table 4. Aircraft Interface PWA to Audio Compressor PWA Interface Signals
Signal Name
Description
CH 1 IN HI
Single ended, Channel 1 audio output to Audio Compressor. Signal
level is 2 Vrms
$
10% with reference signal applied to CVR Channel
1 input.
CH 2 IN HI
Single ended, Channel 2 audio output to Audio Compressor. Signal
level is 2 Vrms
$
10% with reference signal applied to CVR Channel
2 input.
CH 3 IN HI
Single ended, Channel 3 audio output to Audio Compressor. Signal
level is 2 Vrms
$
10% with reference signal applied to CVR Channel
3 input.
CH 4 IN HI
Single ended, Channel 4 audio output to Audio Compressor. Signal
level is 1.33 Vrms
$
10% with reference signal applied to CVR
Channel 4 input.
CH IN RTN
Return signal for channel 1, 2, 3, and 4 audio signals. Not con-
nected to ground on Aircraft Interface.
STOP L
Conditioned STOP RECORDING signal output. +5 V through 10
kohms for not asserted. Less than 0.4 V sinking 3.5 ma when as-
serted.
RECORD L
Conditioned RECORD ON signal output. +5 V through 15 kohms
when not asserted. Ground through 10 kohms when asserted.
TEST L
Conditioned PUSH TO TEST signal output. +5 V through 10 kohms
for not asserted. Less than 0.4 V sinking 3.5 ma when asserted.
AUDIO OUT
Audio monitor data input from Audio Compressor. Signal level is
2.55 Vrms
$
30% into 622 ohms when Reference Signal is applied
to one CVR audio input.
AUDIO OUT RTN
Return signal for AUDIO OUT. Grounded on Audio Compressor and
Aircraft Interface.
TEST GOOD L
Push-to-test BIT result input from Audio Compressor. Low indicates
test passed. DS1 on the Audio Compressor Board.
VOICE ERASE L
Conditioned voice erase signal output. +5 V through 10 kohms
when high. Less than 0.4 V sinking 3.5 ma when low.
ROTOR SPEED IN
Single ended rotor speed signal output. In phase with RO-
TOR SPEED IN HI. +5 V through 10 kohms when high. Less than
0.4 V sinking 3.5 ma when low.
CVR FAULT L
CVR fault indicator input from Audio Compressor. Low indicates
fault. DS2 on the Audio Compressor Board.
GMT IN
(A, B)
Provides conditioned, differential GMT input signal to Audio Com-
pressor.
PREAMP PWR FAIL L
Preamp power fail indication output to Audio Compressor. High is
+5V from 10 kohms and indicates no fault. When preamp power is
less than +15 V output goes low and sinks 3.5 ma at less than 0.4 V.
The document reference is online, please check the correspondence between the online documentation and the printed version.
