COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 150
July 21/17
Testing & Fault Isolation
23–70−30
Use or disclosure of information on this sheet is subject to
the restrictions on the cover page of this document.
Table 105. CSMU Troubleshooting Chart
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 Inter-
ference
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 −
Connector
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
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