COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 145
July 21/17
Testing & Fault Isolation
23–70
−
30
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Table 104 Main Processor Troubleshooting Chart (Continued)
Item
ID
Function Type
Failure
Mode
Local Effect
Next Effect
End Effect
B019
−
Analog
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
E020
−
CAM
and
Pre
Amp
Power
Audio I/P
−
Power
The CAM
and Pre Amp
Power are
open
The power is
note available
to the Cockpit
Area Micro-
phone or the
Preamplifier
Power
Loss of Cockpit
Area Micro-
phone &
Preamplifier
Power
Loss of Cockpit Area Micro-
phone & Preamplifier Power
Audio I/P
−
Power
The CAM
and Pre Amp
Power are
shorted
The output
voltage is not
disrupted and
the system
/FPGA/DAP
softeware is
not alerted
The system
softeware is
unable to dis-
rupt this output
via control pin
from the FPGA
Loss of Cockpit Area Micro-
phone & Preamplifier Power
F021
−
Analog
Audio
Monit-
or O/P
Ch HI
Audio O/P HI
The Analog
Audio Monit-
or O/P Ch HI
is open
The high out-
put is not
scaled up by
the output
stage and
does not pass
through the
output trans-
former
The Analog Au-
dio Monitor
Output Chan-
nel HI does not
function
Loss of the Analog Audio Mon-
itor Output Channel HI
Audio O/P HI
The Analog
Audio Monit-
or O/P Ch HI
is shorted
The high out-
put is not
scaled up by
the output
stage and
does not pass
through the
output trans-
former
The Analog Au-
dio Monitor
Output Chan-
nel HI does not
function
Loss of the Analog Audio Mon-
itor Output Channel HI
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