COMPONENT MAINTENANCE MANUAL
AVIATION RECORDERS
Model FA5000
Rev. 03 Page 228
Feb. 27/13
FDR Function Testing & Fault Isolation
23–70
−
40
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the restrictions on the cover page of this document.
Table 205. Main Processor Troubleshooting Chart (Continued)
Item
ID
Function Type
Failure
Mode
Local Effect
Next Effect
End Effect
Audio I/P
Audio I/P
Tone Test 4
is shorted
Audio CODEC
receives/re-
cords either no
audio tone test
or a continu-
ous tone test
from the DSP
No audio tone
test or a con-
tinuous tone
test is per-
formed
No Effect
B018
−
Ana-
log
Area
MIC
Audio
HI
Audio I/P HI
Analog Area
MIC I/P HI is
open
Inputs Channel
4 and the Area
Microphone
Channel HI
both get pro-
cessed at the
same time
The system is
unable to con-
vert the Area
Microphone in-
terface signal
to differential
format in order
to be compat-
ible with Chan-
nel 4 Audio Mi-
crophone HI in-
put
Loss of Channel 4 Audio Mi-
crophone HI
Audio I/P HI
Analog Area
MIC I/P HI is
shorted
Inputs Channel
4 and the Area
Microphone
Channel HI do
not get pro-
cessed at all
The system
does not to
convert the
Area Micro-
phone inter-
face signal to
differential
format in order
to be compat-
ible with Chan-
nel 4 Audio Mi-
crophone HI in-
put
Loss of Channel 4 Audio Mi-
crophone HI
B019
−
Ana-
log
Area
MIC
Audio
LO
Audio I/P LO
Analog Area
MIC I/P LO is
open
Inputs Channel
4 and the Area
Microphone
Channel LO
both get pro-
cessed at the
same time
The system is
unable to con-
vert the Area
Microphone in-
terface signal
to differential
format in order
to be compat-
ible with Chan-
nel 4 Audio Mi-
crophone LO
input
Loss of Channel 4 Audio Mi-
crophone LO
Audio I/P LO
Analog Area
MIC I/P LO is
shorted
Inputs Channel
4 and the Area
Microphone
Channel LO do
not get pro-
cessed at all
No Effect
No Effect
Rev.04 Page 228
Mar. 21/14
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