HP OfficeJet Pro K850dn User Manual

Testing media skew
If information on the printed pages is consistently slanted, perform a paper skew test and check if the
skew is within the acceptable range for the printer.
●Printer driver
Click the Services tab, click Service this device, and then follow the onscreen instructions.
●Toolbox (Windows)
Click the Printer Services tab, click Test Paper Skew, and then follow the onscreen instructions.
●HP Printer Utility (Mac OS)
Open Information And Support, click Test Paper Skew, and then follow the...

Calibrating the color
Whenever you replace a printhead, the printer automatically calibrates the colors to ensure the best
print quality. If you are not satisfied with the appearance of the colors, you can calibrate colors
manually.
●Printer driver
In Windows 2000 or XP, click the Services tab, click Service this device, and then follow the
onscreen instructions.
In Windows 98, click the Services tab, click Calibrate Color, and then follow the onscreen
instructions.
●Toolbox (Windows)
Click the Printer...

Troubleshooting
Troubleshooting tips and resources
●For a paper jam problem, see Clearing jams.
●For paper-feed problems, such as the paper skew, see 
Resolving paper-feed problems.
Some printer problems can be resolved by resetting the printer.
To reset the printer
1.
Press 
 (Power button) to turn off the printer.
2.Disconnect the power cord from the printer.
3.Wait about 10 seconds, and then reconnect the power cord.
4.
Press 
 (Power button) to turn on the printer.
General troubleshooting tips
Ensure...

●If the printer is connected directly to a computer, it is set up to point to the correct port.
●If the printer is connected to a network, the correct IP address is used.
Resolving printing problems
Printer shuts down unexpectedly
Check power and power connections.
Make sure the printer is connected firmly to a functioning alternating current (AC) power outlet. See
Printer specifications for voltage requirements.
All printer lights are blinking 
A non-recoverable error has occurred.
Reset the printer....

Check printer setup for network environment
Ensure the correct printer software and printer software port are being used. For more information
about network connections, see 
Configuring the printer (Windows), Configuring the printer (Mac OS),
or the documentation provided by your network vendors.
Check any personal firewall software installed on the computer
The personal software firewall is a security program that protects a computer from intrusion.
However, the firewall might block communication...

Check media settings
Make sure the page settings in the printer software matches the width and length of media loaded in
the tray. See 
Changing print settings.
Check the parallel port on your computer
If you are using a parallel cable, make sure the printer is connected directly to the parallel port. Avoid
sharing the port with other devices, such as a Zip drive or other printers.
Placement of the text or graphics is wrong
Check how the media is loaded
Make sure the paper guides fit snugly against the...

Poor print quality and unexpected printouts
Check the printheads and ink cartridges
Replace any clogged or worn printheads or low ink cartridges (see Maintaining the printheads), and
try to print again.
Check the paper quality
The paper might be too moist or too rough. Make sure the media used meets HP specifications (see
Selecting print media), and try to print again.
Check the type of media loaded in the printer
●Make sure the tray supports the type of media you have loaded. See Understanding...

Check print settings
●When you print documents that use a large quantity of ink, allow more time to dry before
handling the printouts. This is especially true for transparencies. In the printer software, select
the Best print quality. Also increase the ink drying time and reduce the ink saturation using 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...

Clean the print zone of the printer
After extensive printing, ink might be deposited on the print zone of the printer, causing ink to smear
on the non-printed side of the media or the edge of a stack of printed media. To remove the
deposited ink, use a lint free cloth to clean the print zone, including the plastic ridges.
Enable the printers output ramp
When printing in Fast Normal (default) print mode, the printer does not use the output ramp to hold
each printed page before releasing it onto the output...

Ink is not filling the text or graphics completely
Check the ink cartridges
Ink cartridges might have run out of ink. Replace any empty cartridge. Or try removing and
reinstalling the cartridges, make sure they snap firmly into place. See 
Replacing the ink cartridges.
Check the media type
Some media types are not suitable for use with the printer. See 
Selecting print media.
Output is faded or dull colored
Check the print mode
The Fast Normal printer mode allows you to print at a faster rate. It is good...