190-02207-02 Rev. 1 GPS 175/GNX 375 Pilot’s Guide 1-5System at a GlancePilot Interface1.3 Unit PowerThe unit receives power directly from the aircraft’s electrical system. Upon power-up,the bezel key backlight momentarily illuminates. System failure annunciationstypically disappear within the first 30 seconds after power-up.The start-up screen presents the unit software versions, the name and status of allinstalled databases, and the Database Updates page access key. These features areavailable only at power up.Tapping Continue advances to the Instrument Test page.1.3.1 Instrument TestTo ensure safe operation, continuous built-in test features exercise the unit’sprocessor, memory, external inputs, and outputs. The Instrument Test page displaysthe results of all external equipment checks performed by the unit.1.3.2 Power OffWARNINGNEVER ATTEMPT TO POWER OFF THE UNIT WHILE AIRBORNE UNLESSOPERATIONAL PROCEDURES DICTATE.If an instrument remains flagged after one minute, check the status of theassociated LRU, then contact a Garmin dealer for support.Review this list to ensure that allCDI outputs and other displayeddata are correct for theconnected equipment.Pushing and holding the Power key for0.5 seconds initiates the power off sequence.Shutdown occurs once the timer reaches zero.Power off annunciation temporarily replacesthe knob function indicator.
