Troubleshooting
Problems printing an alignment page
Note: Printhead alignment takes approximately 8 minutes. At the
end of the process, two alignment pages print. Do not open any
covers or push any buttons until the alignment pages have printed.
Check the printer to ensure the following:
Power light is on and not blinking. When the printer is first
turned on, it takes approximately 45 seconds to warm up.
No lights on the control panel are lit or blinking and that the
printer is in the Ready state. If lights are lit or blinking, see
"Control panel" on page 14.
Power supply, power cord, and other cables are working and
firmly connected to the printer.
All packing tapes and materials are removed from the printer.
Printheads and ink cartridges are properly installed in their
correct color-coded slots. Press down firmly on each one to
ensure proper contact. Ensure you have removed the tape from
each printhead.
Printhead latch and all covers are closed.
Rear-access panel or duplex unit is locked into place.
Media is loaded correctly in the tray and is not jammed in
the printer.
Problems installing software
Verify installation preliminaries
The computer meets the system requirements (see the onscreen
user guide on the Starter CD).
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. Also, 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, run the uninstall utility to perform a clean printer driver
uninstallation. On the starter CD, click Utilities, and then click
Uninstaller. Restart your computer, and re-install the printer
driver.
Problems connecting to a network
Note: After correcting any of the following, run the setup
program again.
General network troubleshooting
If you are unable to install the printer software, verify that:
All cable connections to the computer and the printer
are secure.
The network is operational and the network hub is turned on.
All applications, including virus protection programs and
personal firewalls, are closed or temporarily disabled.
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, locate the IP address, and then enter the
IP address manually in the installation program.
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. For instructions, see
"Configuration page" on page 18.
2 From the Windows desktop, click Start, click Settings,
and then click Printers; or click Start, and then click Printers
and Faxes (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.
If the Link light on the network connector does not turn on,
make sure that all of the "General network troubleshooting"
conditions listed above are met.
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 doing so.
For more information, see the onscreen user guide on the
Starter CD.
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
button) three times, and then release
If you have installed the printer driver, uninstall and then
re-install the printer driver.
Note: For late-breaking information, see the Readme file and
release notes or visit the product support website at
www.hp.com/support/officejetprok850.
(Resume
(Power button).
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