NaviTEK NT 153800 Iss 1User Guide Page 6Switching ON and OFFTo switch the tester ON, press and hold the Power button. Wait until the home screen isvisible on the display; the tester is ready for use.To switch the tester OFF, press and hold the Power for approximately 1/2 second, a shutdownmessage is displayed on the screen. The currently stored setup is saved.Power SavingPower saving preferences are selected from SETUP>SYSTEM>PREF. Auto off can be Disabled(tester remains ON indefinitely), or set to switch the tester OFF after three, 10 or 30 minutesof inactivity. The backlight can be set to Always On, or to dim to 50% brightness after threeminutes of inactivity. Note that when mains power is connected the display is always on fullbrightness and the tester remains ON indefinitely.Master ResetIn the unlikely event of a system lock-up which prevents the tester from being switched OFF,it may be necessary to perform a master reset. This will not delete any stored data.• Remove the power module or battery pack to access a small aperture in the NaviTEKNT (Fig 2).• Insert a paper clip into the reset hole and press the internal reset switch.Fig 2• Replace the power module or battery pack.