Why are the wrong keys responding to button presses?
A. It may be necessary to re-calibrate the touch-screen. To do this it will be necessary to power down the instrument. Apply power while holding a finger on the touch-screen until the unit powers up in to Diagnostics mode. Select the Touch calibration button, if the button cannot be operated because the calibration is very far out, wait approximately 5 minutes and the unit will automatically go to the screen calibration routine. Cross hairs will appear in the top-left corner. Using a suitable (blunt) pointing device, such as the stylus supplied, touch the centre of the cross hairs, repeat as requested. Once calibration has been completed the instrument will return to the diagnostic page, press Quit and confirm with Yes. The instrument will then re initialise.
