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This site helps you pin point  print-quality problems and what to do to correct them. Often print- quality problems can be handled easily by
making sure that the printer is properly maintained,, or running a cleaning page.

Most  print-quality problems can be solved by following the list below.

  • Check the printer driver to make sure that you are using the best available print quality option.
  • Try printing with one of the alternative printer drivers. The most recent printer drivers area available for download from http://www.hp.
    com/go/lj4250_software or http://www.hp.com/go/lj4350_software .
  • Clean inside of the printer.
  • Check paper type & quality.
  • Check  EconoMode is off..
  • Troubleshoot general printing problems.
  • Install a new HP print cartridge, and then check the print quality again. (See the instructions provided with the print cartridge.  
             If the page is completely blank check to make sure that the sealing tape is removed    from the
             toner cartridge and ensure that the toner cartridge is installed correctly.
  1. Make sure that the print cartridge is fully
    installed.
  2. The toner level in the print cartridge might be
    low.
  3. Replace the print cartridge.
  4. The media might not meet HP specifications
    (for example, the paper is too moist or too
    rough).
  5. The printer might be due for maintenance.
    Check this by printing a copy of the supplies
    status page. If maintenance is due, order and
    install the printer maintenance kit.
Light print (partial page)
  1. Make sure that the print cartridge is fully
    installed.
  2. Make sure that the EconoMode setting is
    turned off at the control panel and in the printer
    driver.
  3. Open the Configure Device menu at the printer
    control panel. Open the Print Quality submenu
    and increase the TONER DENSITY setting.
  4. Try using a different type of paper.
  5. The print cartridge might be almost empty.
    Replace the print cartridge.
Light print (entire page)
Specks might appear on a page after a jam has
been cleared.
  1. Print a few more pages to see if the problem
    corrects itself.
  2. Clean the inside of the printer and run a
    cleaning page to clean the fuser.
  3. Try using a different type of paper.
  4. Check the print cartridge for leaks. If the print
    cartridge is leaking, replace it.  
Specks
  1. Make sure that the environmental
    specifications for the printer are being met.
  2. If the paper is rough, and the toner easily rubs
    off, open the Configure Device menu at the
    printer control panel. Open the Print Quality
    submenu, select FUSER MODES , and then
    select the paper type you are using. Change the
    setting to HIGH 1 or HIGH 2, which helps the
    toner fuse more completely onto the paper.
  3. Try using a smoother paper.
Dropouts
  1. Print a few more pages to see if the problem
    corrects itself.
  2. Clean the inside of the printer and run a
    cleaning page to clean the fuser.
  3. Replace the print cartridge.
  4. The printer might be due for maintenance.
    Check this by printing a copy of the supplies
    status page. If maintenance is due, order and
    install the printer maintenance kit.
Lines
  1. Do not use paper that has already been run
    through the printer.
  2. Try using a different type of paper.
  3. Print a few more pages to see if the problem
    corrects itself.
  4. Turn over the stack of paper in the tray. Also,
    try rotating the paper 180°.
  5. Open the Configure Device menu at the printer
    control panel. On the Print Quality submenu,
    increase the TONER DENSITY setting.
  6. Make sure that the environmental
    specifications for the printer are being met.
  7. Replace the print cartridge.
Gray background
  1. Print a few more pages to see if the problem
    corrects itself.
  2. Try using a different type of paper.
  3. Make sure that the environmental
    specifications for the printer are being met.
  4. Clean the inside of the printer and run a
    cleaning page to clean the fuser.
  5. The printer might be due for maintenance.
    Check this by printing a copy of the supplies
    status page. If maintenance is due, order and
    install the printer maintenance kit.
  6. Replace the print cartridge.
Toner smear
Loose toner, in this context, is defined as toner that
can be rubbed off the page.

  1. If paper is heavy or rough, open the Configure
    Device menu at the printer control panel. On
    the Print Quality submenu, select FUSER
    MODES , and then select the paper type you
    are using. Change the setting to HIGH 1 or
    HIGH 2, which helps the toner fuse more
    completely onto the paper. (See Print Quality
    submenu .) You must also set the type of paper
    for the tray you are using.
  2. If you have observed a rougher texture on one
    side of your paper, try printing on the smoother
    side.
  3. Make sure that the environmental
    specifications for the printer are being met.
  4. Make sure that type and quality of the paper
    you are using meet HP specifications.
  5. The printer might be due for maintenance.
    Check this by printing a copy of the supplies
    status page. If maintenance is due, order and
    install the printer maintenance kit.
Loose toner
  1. Print a few more pages to see if the problem
    corrects itself.
  2. If the distance between defects is 38 mm (1.5
    inches), 55 mm (2.2 inches), or 94 mm (3.7
    inches), the print cartridge might need to be
    replaced.
  3. Clean the inside of the printer and run a
    cleaning page to clean the fuser.
  4. The printer might be due for maintenance.
    Check this by printing a copy of the supplies
    status page. If maintenance is due, order and
    install the printer maintenance kit.
Repeating defects
Repeating image
This type of defect might occur when using
preprinted forms or a large quantity of narrow
paper.
  1. Print a few more pages to see if the problem
    corrects itself.
  2. Make sure that type and quality of the paper
    you are using meet HP specifications.
  3. The printer might be due for maintenance.
    Check this by printing a copy of the supplies
    status page. If maintenance is due, order and
    install the printer maintenance kit.
  4. If the distance between defects is 38 mm (1.5
    inches), 55 mm (2.2 inches), or 94 mm (3.7
    inches), the print cartridge might need to be
    replaced.
  1. Print a few more pages to see if the problem
    corrects itself.
  2. Make sure that the environmental
    specifications for the printer are being met.
  3. The printer might be due for maintenance.
    Check this by printing a copy of the supplies
    status page. If maintenance is due, order and
    install the printer maintenance kit.
Misformed characters
  1. Print a few more pages to see if the problem
    corrects itself.
  2. Verify that there are no torn pieces of paper
    inside the printer.
  3. Make sure that paper is loaded correctly and
    that all adjustments have been made. Make
    sure that the guides in the tray are not too tight
    or too loose against the paper
  4. Turn over the stack of paper in the tray. Also,
    try rotating the paper 180°.
  5. Make sure that the type and quality of the paper
    you are using meet HP specifications.
  6. Make sure that the environmental
    specifications for the printer are being met.
Page skew
  1. Turn over the stack of paper in the tray. Also,
    try rotating the paper 180°.
  2. Make sure that the type and quality of the
    paper you are using meet HP specifications.
  3. Make sure that the environmental
    specifications for the printer are being met.
  4. Try printing to a different output bin.
  5. If paper is lightweight and smooth, open the
    Configure Device menu at the printer control
    panel. On the Print Quality submenu, select
    FUSER MODES , and then select the paper
    type you are using. Change the setting to LOW
    , which helps reduce the heat in the fusing
    process. You must also set the type of paper
    for the tray you are using.
Curl or wave
  1. Print a few more pages to see if the problem
    corrects itself.
  2. Make sure that the environmental
    specifications for the printer are being met.
  3. Turn over the stack of paper in the tray. Also,
    try rotating the paper 180°.
  4. Make sure that paper is loaded correctly and
    all adjustments have been made.
  5. Make sure that the type and quality of the
    paper you are using meet HP specifications.
  6. If envelopes are creasing, try storing
    envelopes so that they lie flat.
Wrinkles or creases
  1. Print a few more pages to see if the problem
    corrects itself.
  2. Make sure that the type and quality of the paper
    you are using meet HP specifications.
  3. Replace the print cartridge.
Vertical white lines
This defect typically occurs when the print
cartridge has far exceeded its rated life of pages.
For example, if you are printing a very large
quantity of pages with very little toner coverage
  1. .Replace the print cartridge.
  2. Reduce the number of pages that you print
    with very low toner coverage.
Tire tracks
  1. Print a few more pages to see if the problem
    corrects itself.
  2. Make sure that the type and quality of the paper
    you are using meet HP specifications.
  3. Make sure that the environmental specifications
    for the printer are being met.
  4. Replace the print cartridge.
White spots on black
Scattered lines
  1. Make sure that the type and quality of the paper
    you are using meet HP specifications.
  2. Make sure that the environmental specifications
    for the printer are being met.
  3. Turn over the stack of paper in the tray. Also, try
    rotating the paper 180°.
  4. Open the Configure Device menu at the printer
    control panel. Open the Print Quality submenu
    and change the TONER DENSITY setting.
  5. Open the Configure Device menu at the printer
    control panel. On the Print Quality submenu,
    open OPTIMIZE and set LINE DETAIL=ON .
  1. Make sure that the type and quality of the
    paper you are using meet HP specifications.
  2. Make sure that the environmental
  3. specifications for the printer are being met.
  4. Turn over the stack of paper in the tray. Also,
    try rotating the paper 180°.
  5. Do not use paper that already has been run
    through the printer.
  6. Decrease the toner density. Open the
    Configure Device menu at the printer control
    panel. Open the Print Quality submenu and
    change the TONER DENSITY setting.
  7. Open the Configure Device menu at the printer
    control panel. On the Print Quality submenu,
    open OPTIMIZE and set HIGH TRANSFER=ON .
Blurred print
  1. If an image that appears at the top of the page
    (in solid black) repeats further down the page
    (in a gray field), the toner might not have been
    completely erased from the last job. (The
    repeated image might be lighter or darker than
    the field it appears in.)
  2. Change the tone (darkness) of the field that the
    repeated image appears in.
  3. Change the order in which the images are
    printed. For example, have the lighter image
    at the top of the page, and the darker image
    farther down the page.
  4. From your software application, rotate the
    whole page 180° to print the lighter image first.
  5. If the defect occurs later in a print job, turn the
    printer power off for 10 minutes, and then turn
    the printer power on to restart the print job.
Random image repetition
Printer Quality Descriptions
Poor Print Quality Trouble Shooting