COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 29
July 21/17
Description and Operation
23–70
−
30
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
P/N 500X-500X-( )
120‐Minute Audio Monitor Scheme
Legend:
CAM – Cockpit Area Microphone
CH – Channel
HQ – High Quality
Pilot Audio
Co‐Pilot Audio
CH 2
CH 1
CH 3
CH 1
(150‐3500 Hz)
FA5000 CVR
PUSH‐TO‐TEST
620 Hz - 660 Hz
TEST
∑
HQ CH1 ,
HQ CH2,
HQ CH3 ,
HQ CAM
BULK ERASE
400 Hz
ERASE “A” + “C”
3rd Crew Member/
Spare Audio
Cockpit Area Mic
(CAM) Audio CH 4
CH 2 (HQ)
(150‐3500 Hz)
CH 3 (HQ)
(150‐3500 Hz)
CH 4 (HQ)
(150‐6000 Hz)
ERASE
TO
CONTROL UNIT
HEADSET JACK
AUDIO OUT
CH1 (HQ)
CH 2 (HQ)
CH 3 (HQ)
CAM (HQ)
Figure 16.
Model FA5000 CVR, 120‐Minute Audio Monitor Schemes
(3) Control Unit Test and Bulk Erase Signals
The indicator signal is used to drive the TEST indicator in the Model S151/S161,
Model S152/S162, and Model S251/S261 Control Units. Refer to the Component
Maintenance Manual, ED
−
56A Control Units, Preamplifier, & Microphone Modules ,
ATA 23–70–05, Part Number 165E1747-00. The +18 Vdc is a short-circuit protected
30 mA line.
All control units provide the FA5000 CVR with three control signals: Erase “A”, Erase
“C”, and Push-To-Test. The Erase “A” and Erase “C” signals are used to initiate a
bulk erasure of the crash protected solid-state memory. The ERASE pushbutton
must be pressed for more than two seconds and then released to initiate the bulk
erase function. Landing gear and brake interlocks are provided in the aircraft wiring
to prevent memory erasures during flight conditions.
The Bulk Erase function will not be activated if Voice Erase “A” is grounded or con-
nected to Voice Erase “C” for 0.5 seconds or less. The function will be activated if
Voice Erase “A” is connected to Voice Erase “C” for 2 seconds or more then ground-
ed.
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 FA5000 which is used to test the circuitry of all the audio channels. In a
successful test, the FA5000 Recorder provides a TEST INDICATOR signal which
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