Installation Manual Part 7

FCC ill: CDG-ARTU EXHIBIT C
MAGNAST AR C-2000 DIGITAL AIRBORNE TELEPHONE SYSTEM
The radio fault handset text message shown below will display a three digit code if the ARTU
detects a built in test fault. The red fault indicator on the front of the unit will also be illuminated
if this message appears. The fault codes may be an even or an odd number. Even numbered fault
codes indicate that the ARTU has experienced a recoverable fault. The fault may clear itself
within a few minutes. If the problem does not clear itself, then reboot the ARTU. This can be
accomplished by pulling the circuit breaker an removing power for greater than 15 seconds. If the
problem reoccurs, then the ARTU should be replaced. Odd numbered faults indicate a non-
recoverable fault and usually indicate an intermittent or broken ARTU. Intermittent problems may
be cleared by cycling power for greater than 15 seconds. If an ARTU is replaced, please include
the reported fault code and any other relevant information with the unit to explain the reason for
unit replacement.
Radio
Fault
xxx
The waiting on system warm-up handset text message shown below will be displayed when the
system is first powered up and has just completed built in test. The system warm-up is to allow
the ARTU reference oscillator to warm-up and meet the frequency accuracy required for the
system. This warm-up time lasts for four minutes after the system completes power-up built in
test.
The radio overternp fault handset text message shown below will be displayed if the radio detects
an abnormal over temperature problem The ARTU has over temperature protection and will shut
down if this occurs. The ARTU will automatically recover once the unit has cooled down. This
message will only be displayed for a short time prior to the ARTU shutting down.
Radio
OVertemp
Fault
Waiting on
System
Warm-up
Check Fan
9-33
RevB