G1000 / GFC 700 System Maintenance Manual - 300/B300 Series King Air Page 5-89
190-00716-01 Revision 4
5.26 GSR 56 Troubleshooting
Symptom Recommended Action
No communication with GSR 56
• Check power wiring and pin out of GSR 56 unit.
• Ensure GSR 56 configuration option has been loaded.
No or low-quality Iridium signal
• Ensure the Iridium antenna has an unobstructed view of satellite
constellation.
• Check the Iridium antenna cable and connectors.
• Verify antenna ground plane is adequate.
No audio output
• Check wiring from GSR 56 toGDL 59 or from GSR 56 to GIA #1 (stand-
alone), as applicable to the installation.
• Verify subscription with Garmin Connext (reference Section 7.28).
Unable to make a phone call
• Verify signal quality is adequate
• Verify communication between GSR 56 and the display/control device
• Verify subscription with Garmin Connext (reference Section 7.28).
5.27 GTS 820/850 Troubleshooting
Problem Cause Solution
Unit does not power up – Data
failed message
Improper wiring; circuit breaker open Ensure power is properly wired to the
GTS 820/850 and the TRFC circuit
breaker is closed
Improper configuration Verify that the GTS 820/850 is
configured correctly for the desired
display
Traffic Display erroneously
indicates TA at own ship position
Suppression bus I/O fault Check the mutual suppression line to
ensure it is connected to the correct
pins at the GTS 820/850 as well as
the installed transponder. Ensure
there are no fractures in the wire, and
that the suppression line is
functioning properly.
No Audio alerts Improper wiring; Volume not set correctly Ensure the audio is properly wired
from the GTS 820/850 and volume is
not set too low
Calibration Fault Factory calibration invalid If the unit fails to go into operate
mode then return to Garmin for
service
Configuration Fault Both internal and external configuration
checks failed
Verify the configuration
Verify wiring to the configuration
module and replace if necessary
FPGA Fault Internal Fault Return to Garmin for service
ROM Fault Internal Fault Return to Garmin for service
Execution Fault Internal Fault Return to Garmin for service
Electrical Fault Internal Fault Return to Garmin for service
Whisper Shout Fault Internal Fault Return to Garmin for service
Transmit Power Fault Internal voltages are out of tolerance Check power connections to the GPA
65 to verify that they are not
connected to ground or each other.
Ensure that power and ground
connections to the GPA 65 are
connected in their proper place.
Verify input voltage and if it continues
return to Garmin for service.
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