Lexmark M410 Service Manual - Page 106

4045-XXX Adjustment Procedures Printhead Assembly This adjustment must be performed whenever the printhead is removed, replaced or the printhead mounting screws are loosened. An incorrectly adjusted printhead produces horizontally skewed images down the page. To perform the printhead adjustment: 1. Turn the printer off. 2. Press and hold Return and Go. 3. Turn the printer On and release the buttons when "Performing Self Test" displays. 4. Select Print Test, Tray 1 and Single from the menu. The test page should only be printed on letter or A4 paper from Tray 1. The Print Test page consists of horizontal lines that can be used for skew adjustment, page count setting, printer serial number code levels and print registration settings. 5. Check the Print Test page for any sign of skew by folding the paper in half (left edge to right edge). Check the horizontal lines at the top left and top right of the test page for equal distance from the top of the page. If any adjustment is necessary, perform the following: a. Remove the top cover. b. Loosen the three printhead mounting screws. c. Adjust the position of the printhead. d. Replace the top cover. e. Print a Print Test page and check for skew again. This procedure may take two or three attempts before you get satisfactory results. 6. When you have the correct printhead adjustment, gently tighten the three printhead mounting screws being careful not to move the printhead assembly. 4-2 Service Manual