L3 FA2100 CVR Component Maintenance Manual With Illustrated Parts List page 174

ROC/6 − Audio Setup Procedure
E.
NOTE: L−3AR recommends that an Audio Setup check be performed
every two years, or if the Sound Blaster Audio card is replaced
on the ROC/6−CATS RIU System.
The Sound Blaster Audio Card in the ROC/6 must be set up to ensure that the prop-
er reference voltage levels of the audio test signals are sent to the RIU for testing
the FA2100CVR. The Audio Setup is only required when the RIU or Sound Blaster
Audio Adapter card is removed or replace by a new one or when the autotest results
indicate that the Audio Adapter Card is not outputting the proper signal levels. Indic-
ation of this is when a known good CVR is failing all of the the autotest audio test
functions.
The audio setup process requires the use of the Audio Setup Cable Assembly, p/n:
17TES0417, refer to Figure 121.
Figure 121. Audio Setup Cable Assembly, 17TES0417
NOTE: Selections on the toggle switches of the Audio Setup Cable Assembly, pn
17TES0417, override channel selections made in the CATS software. For
example, if the user selects channels 1,2,3,4 in the Audio Reference Setup
Utility, but selects CH1 on the cable toggle switches, the Audio Reference
Level will be calculated for Channel 1. Reference values calculated for
Channel 1 are functionally equivalent to reference values for channels 2−3.
Sound Card Input/Output Setup
(1)
CAUTION: Remove power from the the RIU before proceeding. If the connector is discon-
nected with power applied to the RIU, the RIU may be damaged.
(a)
(b)
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
LOOP BACK
CONNECTOR
Attach the loop−back connector of the Audio Setup Cable, p/n:
17TES0417, to the Recorder Interface cable, p/n: 17TES0416, coming
from the RIU. Connect the Audio Setup Cable, p/n 17TES0417, to multi-
meter set to "Volts AC".
Ensure that the RIU Sound Card In (SND IN (J3)) cable is connected to
the Sound Card Line−In (blue connector).
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Testing & Fault Isolation
Rev. 15 Page 125
Apr. 14/16