Transponder Interface Check - Garmin GTN 6 Series Maintenance Manual

6.7.2

Transponder Interface Check

If the GTN is interfaced to a GTX 32/33 remote transponder, or a GTX 327/328/330 configured as a
remote transponder, the following checks must be completed:
1. With the GTN unit running in Normal mode and the transponder powered on, go to the home page
and ensure there is no red "X" over the Transponder data field on the screen.
2. Check that a code can be entered into the Code field. Enter a code using the keypad and then touch
the Enter key. Check that the code that was entered is displayed in the transponder data field.
3. If dual transponders are installed, select Transponder 2.
4. Perform steps 1 and 2 for the second transponder.
5. To check that wiring is not crossed, pull the transponder 1 circuit breaker.
6. Check Transponder 1 data field is displaying a red "X".
7. Repeat steps 1 through 6 for GTN #2.
190-01007-B1
Rev. 4
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Page 6-22