L3 FA2100 CVR Component Maintenance Manual With Illustrated Parts List page 153

The CVR test indicator wires, pins 15 and 16 (1mA) may be omitted in installations where
ARINC 557 compatibility is not needed.
REAL TIME
OPEN = FAULT
GND = NO FAULT
CVR
To checkout the operation of the Model FA2100CVR, its associated control unit, micro-
phone preamplifier PWA, and cockpit area microphone, connect a headset to the control
unit and, at a distance of approximately 6-inches, speak into the microphone at a normal
voice level. You should be able to hear your words without any significant distortion.
Bulk erasure of the Model FA2100CVR storage medium is accomplished using the
associated control unit red ERASE pushbutton switch. Aircraft wiring interlocks must be
set (that is, landing gear must be down and brakes locked) to allow the CSMU (solid-state
flash memory) to be erased. To erase the information stored in the flash memory, press
the ERASE pushbutton for more than 2 seconds and release. A 400-Hertz tone should
be heard via the headset for less than 10 seconds.
Should a problem be detected with the Model FA2100CVR and its associated control unit,
remove the units from the aircraft. To determine the fault, place the units on the test
bench for complete testing as listed in the procedures in the Testing Section.
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
ENERGIZE = OPEN (NO CVR FAULT)
DE-ENERGIZED = GRN (CVR FAULT)
Figure 101.
CVR Fault Circuit for Pin 23
CVR FAULT LIGHT
ANNUNCIATOR
PANEL
RELAY
23–70–04
Testing & Fault Isolation
Rev. 15 Page 104
+V
Apr. 14/16