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 improvement in the print quality by performing the alignment procedure yourself. See
Maintaining the printheads.
Check graphics placement
Use the zoom or print preview feature of your software to check for gaps in the placement of
graphics on the page.
Lines or dots are missing from text or graphics
The printheads or printhead contact pads might need cleaning. See Maintaining the printheads.
Resolving paper-feed problems
For information on resolving jams, see Clearing jams.
Media is not supported for the printer or tray
Use only media that is supported for the printer and the tray being used. See Understanding
specifications for supported media.
Media is not picked up from the tray
●Make sure the paper guides are set to the correct markings in the tray for the media size you are
loading. Also make sure the guides are snug, but not tight, against the stack.
●Make sure media in the tray is not curled. Uncurl paper by bending it in the opposite direction of
the curl. Also, check the ink saturation. To increase the ink drying time and reduce the ink
saturation, use an ink slider in conjunction with drying time under Advanced Printing Features
(Windows) or Ink Features (Mac OS) in the printer software. However, note that decreasing ink
saturation might give printouts a washed-out quality.
Media is not coming out correctly
●Make sure the output tray extension is extended, otherwise, printed pages might fall off the printer.
●Remove excess media from the output tray. There is a limit to the number of sheets the tray can
hold.
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							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. Also make sure the guides are snug, but not tight, against the stack.
●Make sure that the tray is not overloaded with paper.
●When you load paper, avoid fanning the stack. Fanning paper can cause static electricity to build
up and intensify multiple-pick problems.
Embedded Web server (EWS) cannot be opened
Check your network setup
●Make sure you are not using a phone cord to connect the printer to the network.
●Make sure the network cable is securely connected to the printer.
●Make sure the network hub, switch, or router is on and working properly.
Check the computer
Make sure the computer that you are using is connected to the network.
Check your Web browser
Make sure the Web browser meets the minimum system requirements. See Operating system and
network protocol specifications.
Check the printer IP address
●Print a configuration page, and then locate the printers IP address on the second page. 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 the Enter key:
ping 123.123.123.123
If a reply appears, the IP address is correct.
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							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 printheads).
Problems installing software
Verify the computer requirements
Make sure the computer meets the system requirements. See 
Operating system and network
protocol specifications.
Verify installation preliminaries
●The computer meets the system requirements. See 
Operating system and network protocol
specifications.
●Before installing software on a Windows computer, ensure all other programs are closed.
●If the computer does not recognize the path to the CD drive that you type, ensure you are
specifying the correct drive letter.
●If the computer cannot recognize the Starter CD in the CD drive, inspect the CD for damage. You
can download the printer driver from 
www.hp.com/support/officejetprok850.
Reinstall the printer software
If you are using Windows and the computer cannot detect the printer, insert the Starter CD, click
Utilities, and then click Uninstaller to perform a clean printer driver uninstallation. Restart your
computer, and re-install the printer driver. See 
Uninstalling the printer software.
Problems connecting to a network
NOTEAfter correcting any of the following, run the setup program again.
General network troubleshooting
If you are unable to install the printer software on the computer, verify that:
●All cable connections to the computer and the printer are secure.
●The network is operational and the network hub is turned on.
●If the Link light on the network connector does not turn on, make sure that all of the
Troubleshooting tips and resources conditions are met.
●All applications, including virus protection programs and personal firewalls, are closed or
temporarily disabled.
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							●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 the Enter key:
ping 123.123.123.123
If a reply appears, the IP address is correct.
If you are using a computer running Windows, make sure that the network ports created in the printer
driver match the printer IP address:
1.Print a configuration page. See 
Understanding and printing the configuration page.
2.From the Windows desktop, click Start, point to Settings, and then click Printers. Or, click
Start, click Control Panel, and then click Printers and Faxes or Printers (depending on the
operating system).
3.Right-click the printer icon, click Properties, and then click the Ports tab.
4.Select the TCP/IP port for the printer, and then click Configure Port.
5.Compare the IP address listed in the dialog box and make sure it matches the IP address listed
on the configuration page. If the IP addresses are different, change the IP address in the dialog
box to match the address on the configuration page.
6.Click OK twice to save the settings and close the dialog boxes.
Though it is not recommended that you assign the printer a static IP address, you might resolve
some installation problems (such as a conflict with a personal firewall) by assigning the printer a
static IP address. For more information, see 
Configure network options.
Resetting printer network settings
If the printer is unable to communicate with the network, reset the printer network settings:
While holding down 
 (Power button), press  (Resume button) three times, and then release 
(Power button).
Uninstall and then re-install the printer driver.
NOTEFor late-breaking information, visit the product support website at www.hp.com/
support/officejetprok850.
Clearing jams
To clear a jam
1.Remove all media from the output tray.
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							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 the output tray, and then check for a jam in the input tray. If
media is jammed in the tray, do the following:
a.Extend the input tray.
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							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 should return to its position on the right side of
the printer. If it does not move to the right, turn off the printer before you remove any jam.
5.After clearing the jam, close all covers, turn on the printer (if you turned it off), and then press 
(Resume button) to continue printing.
The printer will continue printing the next page. You will need to resend any page that was jammed in
the printer.
To avoid jams
●Make sure the printer is placed on a flat surface.
●Make sure that nothing is blocking the paper path.
●Do not overload the tray. See 
Understanding specifications for supported media.
●Load paper properly. See 
Loading media.
●Do not use media that is curled or crumpled.
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							●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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							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 network
●Web browser installed on your computer (either Microsoft Internet Explorer 5.5, Netscape 7.0,
Opera 7.54, Mozilla Firefox 1.0, or Safari 1.2, or later)
To order printing supplies
●Toolbox (Windows)
On the Printer Status tab, click Order Supplies. Your default Web browser starts and displays
a website.
●HP Printer Utility (Mac)
Open Information And Support, click Supplies Status, and then click Order HP Supplies.
●Embedded Web server
In the Other Links section, click Order Supplies. Follow the instructions on the website to select
and order printing supplies.
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