The Two Types of Skew
There are two types of skew that can occur on the base printer: Paper Feed skew and Printhead skew. IMPORTANT! It is possible for the printer to have both these issues at the same time.
Note: The best way to see the skew is to print a page with a border around it. Enter the printer's menus and print a Network Setup page. Compare the border on that p age with the examples below.
Correcting Paper Feed skew
- Check the paper guide in the paper tray. Confirm that the guide on the back and right-hand sides are lightly touching the paper stack, thereby holding the stack in place straight while not binding or bending the paper. This is the most common cause for this issue.
- Check the paper pick rollers for each tray. Clean off the rollers with a dry cloth and try printing again. If cleaning the feed rollers does not correct the issue, see if the feed rollers are worn or dirty. If they are, replace the rollers. The part number for a pair of pick rollers is 40X4308.
- Adjust the paper feed alignment assembly. To do this, you will need both a 7mm nut driver and a 5.5 mm open-end wrench. The 7mm driver is inserted through an access hole in the system card, and the 5.5mm wrench is placed around the nut in the slot to the left of the paper feed alignment assembly. Click here for an image. For the full details on how to perform this procedure, see the printer's Service Manual.
- If the issue continues after checking all of the above items, replace the pick rollers (PN 40X4308) for each of the installed paper trays. If replacement of the pick rollers does not correct the issue, please contact Lexmark Technical Support or your next level of support before arranging any additional service.
Correcting Printhead skew
Note: For the full details on how to perform any procedure listed in the table below, please see the pri nter's Service Manual.
Power off the printer.
Enter the printer's Diagnostic mode. To do so:
Press and hold the down arrow and right arrow buttons.
Then power on the printer while keeping both buttons held down.
Keep both buttons held down until the Diagnostic menu appears or after ten seconds have elapsed. At that point, let go of the buttons.
Enter the Registration menu and sele ct Quick Test. The printer should print out an alignment page. Save this page to use as a guide.
Power off the printer and disconnect the power cord.
Remove the laser (top) cover.
Remove the output cover assembly.
Remove the fuser wiper cover assembly.
Remove the left-hand side cover.
Remove the right-hand side cover.
Remove the five screws securing the laser cover to the machine. IMPORTANT! When removing the laser cover, ensure that the standard bin actuator (flag) does not becomedamaged.
Remove the laser cover.
Loosen the three screws holding the printhead unit in place. Rotate the printhead slightly and secure the printhead into place again.
- If the left-hand side of print is higher than the right, slightly adjust the printhead counter-clockwise.
- If the left-hand side of print is lower than the right, slightly adjust the printhead clockwise.
Reinstall the laser cover.
With the laser cover installed and the operator panel reconnected, you can power on the printer and print another Quick Test page to see if the printhead is now properly aligned. Do not install the remaining covers until after you have confirmed that the printhead is properly aligned.
- You may have to readjust the printhead a few times to make this correct. If further adjustment is required, simply power off the printer, disconnect the power cord, a nd remove the top cover to access the printhead unit and adjust it again.
- The printer has a tolerance of 1mm from left to right. Try to get the top and bottom borders as straight as possible. However, 1mm or less from left to right is within the printer's specifications.
- Use the triangle dots on the top and bottom of the Quick Test page to help determine the skew.
Once you have the skew fixed or within tolerance, reinstall the remaining covers. Once the printer has been reassembled, print one more additional Quick Test page to confirm the issue is corrected.
NOTE: If adjusting the printhead unit does not correct the issue, please contact Lexmark Technical S upport or your next level of support. There are no parts that can be replaced to fix printhead skew.
If only the trailing edge is skewedThe only way to correct this type of issue is to adjust the paper feed alignment assembly to create a small amount of skew along the left and right hand sides to offset the printhead skew at the bottom.IMPORTANT! This will cause the top margin to become skewed as well.The objective here is to get the overall skew, or the desired position of the print, to 1mm or as close as possible. This is within the printer's specifications. Use the directions in the table above to get the top border parallel with the edge of the page. Once the top border is set correctly, adjust the paper feed alignment assembly. Again, the objective is to get the overall skew, or the desired position of the pr int, to 1mm or as close as possible. To adjust the paper feed alignment assembly, you will need both a 7mm nut driver and a 5.5 mm open-end wrench. The 7mm driver is inserted through an access hole in the system card, and the 5.5 mm wrench is placed around the nut in the slot to the left of the paper feed alignment assembly. Click here for an image. For the full details on how to perform this procedure, see the printer's Service Manual. If adjusting the printhead unit and the paper feed alignment assembly does not correct the issue, please contact Lexmark Technical Support or your next level of support.
Note: There are no parts that can be replaced to correct this issue.