2 Procedure. 2 Applicable products. 3 Product models. 3 Product numbers. 3 Introduction This procedure will calibrate the control panel of the HP LaserJet M3027, M3035, M5025, M5035, and M4345 MFP products. The steps for calibrating the control panel on these MFPs, are slightly different from other products. Procedure Note: For accurate calibration, use a pen; do not use your finger. Power OFF the device 2. Hold down the # and C keys while powering ON the device. Release keys when a small square appears at the upper left corner. Touch the small square using a pen. Note: Touch the small square in the upper left corner only once; the dot will not disappear when touched. As soon as the square in the upper left corner is touched, another square appears at the lower right corner. Both squares will be shown at the LCD screen. Touch the small square at the lower right corner using a pen. At this point, calibration is complete and the device will continue booting up...