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HP Officejet Pro K850 Color Printer support

Cleaning the Printheads

  • PrintPrint


The printheads have microscopic nozzles that can clog when exposed to the air for more than a few minutes. The printer is designed to prevent nozzles from drying out when the printer is idle. A printhead that is not used for long periods of time can also clog, resulting in a noticeable decrease in print quality. To unclog the nozzles, clean the printheads.
Clean the printheads when lines or dots are missing from printed text or graphics.
NOTE:Cleaning uses ink, so clean the printheads only when necessary. The cleaning process takes up to 3.5 minutes.

Cleaning the printheads

Choose one of the methods below to clean the printheads.

Clean the printheads from the control panel

  1. Press and hold the Power button.
  2. While holding down the Power button, use one of the following cleaning level methods.
    NOTE:Perform the next level of cleaning only if results from the previous level are not satisfactory.
    • For level 1 cleaning, press the Resume button six times.
    • For level 2 cleaning, press the Resume button five times.
    • For level 3 cleaning, press the Resume button seven times.
  3. Release the Power button. The printer begins the cleaning process.

Clean the printheads from the Embedded Web Server (EWS)

  1. Launch the EWS by using one of two methods:
    • A Web browser - type the IP address assigned to the printer in the address bar of the Web browser.
    • The Information tab of the printer Toolbox - click the Launch button in the Embedded Web Server group.
  2. Click the Settings tab.
  3. Click Maintenance in the left pane.
  4. In the Printhead section, select the option to clean printheads from the drop-down list.
  5. Click Apply.

Clean the printheads from the printer driver (Windows)

  1. From the Windows desktop, perform one of the following steps:
    • Click Start, and highlight Settings, and then click Printers.
    • Click Start, and highlight Control Panel, and then click Printers and Faxes or Printers.
  2. Right-click the printer icon, click Properties, and then click the Printing Preferences button.
  3. Click the Services tab.
  4. Click the Printer Services tab, and then click Clean Printheads.

Clean the printheads from the Toolbox (Windows)

  1. Click the Printer Services tab.
  2. Click Clean Printheads, and then follow the onscreen instructions.

Clean the printheads manually

CAUTION:Clean the printhead contacts only after you have attempted to clean the printheads using the instructions above. Printhead contacts contain sensitive electronic components that can be damaged easily.
  1. Open the top cover.
  2. Make sure the printer is turned on.
  3. Wait two or three seconds.
    Then unplug the printer power cord.
    Unplug the power cord from the wall outlet.
    NOTE:Do not turn the printer off by pressing the Power button. This causes the print carriage to move out of reach.
  4. Lift the printhead latch.
  5. Lift the handle of a printhead. Use the handle to pull the printhead out of the slot.
    Figure 1: Printhead handle
  6. Carefully remove any ink from the contact pads on the printhead using a dry, soft, lint-free cloth that will not come apart or leave fibers behind.
    CAUTION:Only wipe the contact pads. Wiping the nozzles (located on the underside of the printhead) can cause severe damage to the printhead.
    Figure 2: Remove ink from contact pads
  7. If some residue remains, slightly moisten the swab with distilled, filtered, or bottled water. Continue wiping the contact pads until the contacts are clean.
  8. After cleaning, place the printhead on a sheet of paper or paper towel. Make sure the nozzles are not in contact with the paper.
  9. Clean the contact points in the printhead slot inside the printer with a dry, soft, lint-free cloth. Make sure all the electrical contacts have had at least five minutes to dry.
  10. Plug the power cord back into the wall outlet.
  11. Plug in the power cord and turn on the printer. The control panel should indicate that the printhead is missing.
  12. Insert the printhead into its color-coded slot. Press down firmly on the printhead to ensure proper contact.
  13. Pull the printhead latch all the way forward, and then press down to ensure that the latch is properly engaged. You might have to apply some pressure to engage the latch.
  14. Where necessary, repeat the above steps for the remaining printhead.
  15. Close the top cover.
  16. Wait while the printer initializes the printheads.
HP Officejet Pro K850 Color Printer

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