HP LaserJet M9040/M9050 Service Manual - Page 351

Control panel touchscreen calibration If the touch screen seems unresponsive, try calibrating it: 1. Turn the product off. 2. Press and hold the number key (#) and the clear key (C) while turning the product on. A dot will display in the upper left corner of the screen. 3. Release the # and C keys. 4. Touch the dot with a blunt object, such as a pencil eraser, and another one will display in the lower right corner. 5. Touch that dot. The product will continue the startup sequence. Simplified scanner and ADF calibration This calibration adjusts the location of the leading edge, the location of the left edge, and the scaling (stretch) of the image. This is a simplified version of the original calibration procedure , which is recommended when full edge to edge scanning is desired. NOTE: Always back up the scanner settings before performing any scan engine calibration. Then you can restore the settings and start over if you encounter problems. NOTE: A service label is located inside the flatbed lower front cover to record the calibration values. If you enter new calibration values, download an new service label, record the new values, and place the new label over the old one. Figure 7-3 The scanner service label 1. Copy the following table to use as a worksheet: ENWW Other diagnostics 333