Garmin GTN 650 Cockpit Reference Guide - Page 42
The GTN cannot - problems
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Message CONFIGURATION Terrain/TAWS configuration is invalid. GTN needs service. CONFIGURATION MODULEGTN configuration module needs service. COOLINGGTN overtemp. Reducing backlight brightness. COOLING FANThe cooling fan has failed. CROSSFILL ERRORCrossfill is inoperative CROSSFILL ERRORGTN software mismatch. See CRG for crossfilled items. Description Action TAWS is inoperative due to a configuration problem with the GTN. This message will be accompanied by a TER FAIL annunciation. Contact dealer for service. The GTN cannot communicate with its configuration module. The GTN may still have a valid configuration. Contact dealer for service. Backlight brightness has been reduced due to high display temperatures. The backlight level will remain high enough to be visible in daylight conditions. Decrease cabin temperature and increase cabin airflow (especially near the GTN). Contact dealer for service if this message persists. The GTN cooling fan is powered, but it is not turning at the desired RPM. Decrease cabin temperature and increase cabin airflow (especially near the GTN) to prevent damage to the unit. Contact dealer for service. Crossfill is not working due to loss of communication with other GTN or due to one GTN needing service. Contact dealer for service. Crossfill is configured Contact dealer to have "on" but is not working software versions updated. due to software mismatch. Messages 36 GTN 625/635/650 Cockpit Reference Guide (CRG) 190-01004-04 Rev. C