Garmin GTN 6 series Maintenance Manual page 34

Problem
OBS Resolver won't calibrate.
OBS indication on GTN does
not agree with OBS setting.
GTN HTAWS Audio not
heard.
GTN is not receiving heading
from compass system
(ARINC 429 heading input
used).
ARINC 429 device is not
receiving data from the GTN.
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Page 4-2
Table 4-1. GTN Troubleshooting Guide
Possible Cause
Incompatible resolver or
improper connection.
GTN resolver input not
calibrated correctly.
Resolver has not been
calibrated.
HTAWS audio volume level
set too low.
Check audio panel volume
and audio wiring.
1. Allow up to 5 minutes for the TAWS audio clips to load.
Main software version has
just been updated. 2. Cycle power on the GTN and verify that the HTAWS audio is working properly.
ARINC 429 input port speed
not correct.
Wiring connections are
incorrect.
GTN ARINC 429 output not
configured correctly.
Receiving LRU ARINC 429
input port speed not correct.
Wiring connections are
incorrect.
Corrective Action
Check the resolver specifications and wiring.
Check wiring and calibration.
Increase HTAWS audio volume level.
Check wiring.
Check ARINC 429 input port speed setting for port that device is connected to and verify that
the speed is correct for that device.
The raw data being received by the GTN can be monitored on the ARINC Inputs page found on
the GTN Diagnostics page. See Section 3.3.5
Check wiring.
Check ARINC 429 output port setting for port that device is connected to.
Check ARINC 429 input port speed setting for port that device is connected to and verify that
the speed is correct for that device.
Check wiring.
190-01007-B1
Rev. 1