HP OfficeJet Pro K850 User Manual

Check ink cartridges
Make sure ink cartridges have not been tampered with. Refilling processes and the use of
incompatible inks can disrupt the intricate printing system and result in reduced print quality and
damage to the printer. HP does not guarantee or support refilled ink cartridges. For ordering
information, see 
HP supplies and accessories.
Colors do not line up properly
Check printheads
The printheads are not automatically aligned when a printhead is replaced. However, you might
notice...

Pages are skewing
●Make sure the paper guides in the tray are adjusted snugly against the media, but do not crinkle
or bend it.
●Avoid loading media of different types or sizes in the tray.
●Make sure media in the tray is not curled. Uncurl paper by bending it in the opposite direction of
the curl.
●Run a media skew test in the Toolbox. See 
Testing media skew.
Multiple pages are being picked up
●Make sure the paper guides are set to the correct markings in the tray for the media size you are
loading....

Troubleshooting installation issues
Problems printing alignment page
When new printheads are installed, the printer automatically prints two alignment pages to align the
printheads. This process takes about eight minutes. Do not open any covers or push any buttons
until the alignment pages have printed. The alignment pages may be discarded after they are
printed. If the printer does not print the pages, then see 
General troubleshooting tips or align the
printheads manually (see 
To align the...

●Make sure the printer is installed on the same subnet as the computers that will be using the
printer.
●If the installation program cannot discover the printer, print the configuration page and enter the
IP address manually in the installation program. See 
Understanding and printing the
configuration page.
●Ping the printer from an MS-DOS prompt (Windows) or Terminal (Mac OS) using the IP address.
For example, if the IP address is 123.123.123.123, type the following at the command prompt
and then press...

2.Check the rear-access panel or the duplex unit.
a.Push the button on either side of the rear-access panel or the duplex unit and remove it.
b.Locate any jammed media inside the printer, grasp it with both hands and pull it towards you.
c.If the jam is in the duplex unit, push the buttons in front of the duplex unit and remove the
cover. If the jam is inside, carefully remove it. Close the cover.
d.Reinsert the rear-access panel or the duplex unit into the printer.
3.If you cannot locate the jam, raise...

b.Pull the paper towards you.
c.Ensure the media is properly aligned in the tray, and then lower the output tray.
4.If you have not found the jam, open the top cover. If there is paper remaining inside the printer,
ensure the carriage has moved to the right of the printer, free any paper scraps or wrinkled
media and pull the media towards you through the top of the printer.
WARNING!Do not reach into the printer when the printer is on and the carriage is stuck.
When you open the top cover, the carriage...

●Always use media that conforms with specifications. See Selecting print media.
●If using recycled media, try another type of media. See 
Selecting print media.
●Make sure the output tray is not overly full when you send a job to print.
●Make sure media is aligned against the right side of the tray.
●Make sure the paper guides are adjusted snugly against the media, but do not crinkle or bend it.
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90 Chapter 5   Maintaining and troubleshooting ENWW
 

6 HP supplies and accessories
This section provides information on HP supplies and accessories for the printer. The information is
subject to change; visit the HP website (
www.hpshopping.com) for the latest updates. You can also
make purchases through the website.
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Ordering printing supplies online
Besides the HP website, you may order printing supplies through the embedded Web server (EWS)
or the Toolbox (Windows).
System requirements for ordering printing supplies
To use the Toolbox, ensure you have the following:
●Internet access
●Printer connected to your computer using a USB or parallel cable, or connected to the network
●Toolbox installed on your computer (supported for Windows only)
To use the EWS, ensure you have the following:
●Printer connected to the...