COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
Model FA5000
Rev. 03 Page 235
Feb. 27/13
FDR Function Testing & Fault Isolation
23–70
−
40
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Table 206. CSMU Troubleshooting Chart(Continued)
Item ID
Function Type
Failure Mode
Local Effect
Next Effect
End Effect
Non
−
Volatile
Memory
Over/Under
Voltage
The Flash Memory
fails: unable to store
data and the
SDRAM is unable to
copy data
The CSMU fails
to operate prop-
erly
The CVDR does not operate
properly: Some data may be
corrupt and may not be re-
corded, stored or copied
Non
−
Volatile
Memory
Electrical In-
terference
Software glitch flips
data bits, causing
data corruption such
as lost, missing or
scrambled data
The CSMU
does not oper-
ate properly:
Some data may
be corrupt and
may not be
copied
The CVDR initially does not
operate: Some data may be
corrupt, lost and/or may not
be recorded, stored or
copied NOTE: The Flash
Memory resets and is able
to store data
0004A
−
Connect-
or J001
Connectivity to
power and commu-
nication
The connector
is open
No power and no
communication
The CSMU fails
to operate
The CVDR fails to operate
Connectivity to
power and commu-
nication
The connector
is shorted
No power and no
communication
The CSMU fails
to operate
The CVDR fails to operate
Rev.04 Page 235
Mar. 21/14
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