L3 FA5000 User Manual

COMPONENT MAINTENANCE MANUAL
AVIATION PRODUCTS
Model FA5000
Rev. 02 Page 131
July 21/17
Testing & Fault Isolation
23–70−30
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the restrictions on the cover page of this document.
Table 103 Aircraft Interface Troubleshooting Chart (Continued)
Pin
ID
Signal Type Signal Function Failure Mode Local Effect End Effect
11 Ground Internal Pre Amp At-
tenuator (Common)
The signal path
is open
The Internal Pre Amp
Attenuator (Com-
mon) Signal fails to
enable Pins 20, 21 or
22
Degraded functionality
11 Ground Internal Pre Amp At-
tenuator (Common)
The signal path
is shorted
No Effect No Effect
12 Discrete I/P Push To Test The signal path
is open
Unable to initiate
testing − cannot de-
tect fault
Unable to perform test −
no indication of fault
12 Discrete I/P Push To Test The signal path
is shorted
Testing runs only
once with a continu-
ous fault indication
Fault light is always on
13 Power/
Ground
Preamp Power Output
(Ground)
The signal path
is open
The Preamp Pwr
Output (Ground) Sig-
nal fails
Unable to hear the pi-
lot(s)
13 Power/
Ground
Preamp Power Output
(Ground)
The signal path
is shorted
No Effect No Effect
14 Power O/P Preamp Power Output
(Hot)
The signal path
is open
The Preamp Power
Output (Hot) Signal
fails
Unable to hear cockpit
audio − no audio is recor-
ded
14 Power O/P Preamp Power Output
(Hot)
The signal path
is shorted
The Preamp Power
Output (Hot) Signal
fails
Unable to hear cockpit
audio − no audio is recor-
ded
15 Differential
Analog
Test Indicator ()) The signal path
is open
No indication of test
status
Pilot(s) cannot determine
test status
15 Differential
Analog
Test Indicator ()) The signal path
is shorted
No indication of test
status
Pilot(s) cannot determine
test status
16 Discrete/
Ground
Test Indicator (−) The signal path
is open
No indication of test
status
Pilot(s) cannot determine
test status
16 Discrete/
Ground
Test Indicator (−) The signal path
is shorted
No Effect No Effect
17 Power/
Ground
Chassis Ground The signal path
is open
Degraded EMI/De-
graded Performance
(757A)
Loss
of power to the entire
recorder (757)
Degraded EMI/Degraded
Performance (757A)
Loss of entire re-
corder (757)
17 Power/
Ground
Chassis Ground The signal path
is shorted
No Effect (757A)
Degraded
EMI/Degraded Per-
formance (757)
No Effect (757A)
Degraded EMI/De-
graded Performance
(757)
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L3 FA5000 Specifications

General

Brand	L3
Model	FA5000
Category	Voice Recorder
Language	English