COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
FA2100CVR
Rev. 15 Page 103
Apr. 14/16
Testing & Fault Isolation
23–70–04
Use or disclosure of information on this sheet is subject
to the restrictions on the cover page of this document.
B.
Model S151/S161, S152/S162, and S251/S261 Control Units
The Model S151/S161, S152/S162, and S251/S261 Control Units have been de-
signed for use with the Model FA2100CVR’s in ED
−
56A compatible systems and
contain a Microphone Preamplifier PWA manufactured with SMT devices. Refer to
ED-56A Control Unit and Microphone CMM, p/n: 165E1747-00 for detail Testing Pro-
cedures for these units.
C.
MODEL S150/S160 MICROPHONE PREAMPLIFIER MODULES
The Model S150/S160 Preamplifiers have also been designed for use with the Mod-
el FA2100CVR’s in ED
−
56A compatible systems that do not require a control unit.
Refer to ED-56A Control Unit and Microphone CMM, p/n: 165E1747-00 for detail
Testing Procedures for these units.
D.
MODEL S055 AND S056 ELECTRET CONDENSER MICROPHONES
The Model S055 and Model S056 Microphones have also been designed for use
with the Model FA2100CVR’s in ED
−
56A compatible systems. Refer to ED-56A
Control Unit and Microphone CMM, p/n: 165E1747-00 for detail Testing Procedures
for these units.
3.
MODEL FA2100CVR RECORDER IN-SERVICE CHECKOUT
A continuous Built-In-Test (BIT) capability is provided at power up to establish and moni-
tor the mission fitness of the hardware. The built-in-test feature has been designed to
perform a continuous test of all bits within the solid-state memory located in the Crash
Survivable Memory Unit (CSMU). Any faults with the unit are stored in non
−
volatile RAM
as a fault history log to aid in troubleshooting.
An additional built-in-test is initiated by pressing a green TEST pushbutton located on the
front panel of the control units (Model S151/S161 or Model S251/S261). A green TEST
indicator is located on the front panel of the Model S151/S161 and Model S251/S261
Control Units to indicate successful completion of the manual test.
The TEST pushbutton is used to generate the 620- to 660-Hertz test tone used for unit
verification. This test tone is developed on the Audio Compressor PWA and applied to
each channel individually where it is processed, stored in memory, read from memory,
and checked for expected frequency and amplitude.
The Model FA2100CVR’s built-in-test (BIT) philosophy is in accordance with guidelines
set forth in ARINC Reports 604
−
1 and 624. Activating the BIT test is sufficient to deter-
mine the mission readiness of the Model FA2100 Cockpit Voice Recorder System. This
operational test is performed as a pre-flight functional checkout of the Model FA2100CVR
and is activated using front panel controls on its associated control unit.
In the GACVR, a continuous Bite Status Output or Recorder Fault is indicated on pin 23.
A ground at pin 23 represents a no fault, while an open equals fault or CVR not installed.
The document reference is online, please check the correspondence between the online documentation and the printed version.
