190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. B Page 6-13
6.5 Ground Checks (Configuration Mode)
The following checks are performed in configuration mode. To enter configuration mode, remove power
from the GTR/GNC. With the GTR/GNC turned off, press and hold the ENT key and apply power to the
GTR/GNC by turning the COM volume knob clockwise. Release the ENT key when the display activates
and ‘Garmin’ appears on the screen.
6.5.1 Calibrate Resolver (GNC Only)
After selecting ‘Resolver’ as the indicator head on the CDI Indicator page (Figure 6-10) of the NAV group,
it is necessary to calibrate the interface between the GNC and the resolver. The accuracy of the system is
dependent on this calibration. The GNC cannot drive multiple resolvers at the same time. It is not
recommended that external resolvers be switched through a relay or other means because the resolver must
be calibrated to the radio as described in this procedure. If multiple resolvers are desired in the installation,
the primary unit must be installed and calibrated as described here. The secondary unit should use the
composite output.
1. After selecting Resolver as the indicator head type, select ‘Cal Resolver’ to calibrate the OBS
resolver.
2. Press ENT.
3. Follow the directions on the GNC display.
Figure 6-23. Calibrate OBS Resolver Page
4. At the end of setup, press ENT to store results.
5. Tune to any VOR frequency.
6. Press the OBS key.
7. Verify that the OBS decoded properly from 0 to 360 degrees.
If the GNC will not accept the calibration, there may be a problem with the resolver interface. Verify
wiring and contact Garmin for assistance if necessary.
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