HP OfficeJet Pro K8600dn User Manual

When the quality of printouts deteriorates, complete the relevant steps based on the
following sequence:
1.Check the health of the printheads. For more information, see 
To check printhead
health.
2.Print the print quality diagnostic page on a clean sheet of white paper. Evaluate
any problem areas, and perform the recommended actions. For more information,
see 
To print the print quality diagnostic page.
3.Clean the printheads. For more information, see 
To clean the printheads.
4.Replace the printheads...

•Toolbox (Windows): Click the Services tab, and then click Print PQ (print
quality) diagnostic page and follow the onscreen instructions.
•HP Printer Utility (Mac OS): Click Print Quality Diagnostics from the
Information and Support panel.
1Printer Information: Shows device information (such as the product model number, serial
number, and firmware version number), the number of pages printed from the trays and
duplexer, the ink level information, and the printhead health status.
2Test Pattern 1: If the...

•Toolbox (Windows): Click the Services tab, and then click Calibrate Linefeed
and follow the onscreen instructions.
•HP Printer Utility (Mac OS): Click Calibrate Linefeed from the Information and
Support panel.
To clean the printheads
If printed characters are incomplete, or dots or lines are missing from printouts, ink
nozzles might be clogged and you might need to clean the printheads.
NOTE:Cleaning uses ink, so clean the printheads only when necessary.
The cleaning process takes up to 3.5 minutes....

1.Open the cover.
2.
If the carriage does not move to the left automatically, press and hold the 
(Resume button) until the carriage moves to the left. Wait for the carriage to stop
moving, and then unplug the power cord from the printer.
3.Lift the printhead latch.
4.Lift the handle of the printhead you want to replace and and pull the printhead out
of its slot.
5.Obtain clean, dry, soft and lint-free cleaning material. Suitable materials include
paper coffee filters and eyeglass lens cleaning paper....

6.Wipe the electrical contacts on the printhead but do not touch the nozzles.
CAUTION:The electrical contacts are small copper-color squares, grouped
on one face of the printhead.
The nozzles are on a different face of the printhead. Ink will be visible on the
nozzles.
Touching the nozzles can cause permanent nozzle damage. Also, ink can
permanently mark clothing.
7.After cleaning, place the printhead on a sheet of paper or paper towel. Make sure
the nozzles are facing up and are not in contact with the...

15.If the printhead light continues to blink, replace the printhead which corresponds to
the blinking printhead light.
16.Wait while the device initializes the printheads and prints the alignment pages. If
the device does not print the pages, start the alignment process manually. For
more information, see 
To align the printheads.
To replace the printheads
NOTE:To find out which printheads work with your printer, see Supplies.
1.Open the cover.
2.
If the carriage does not move to the left automatically,...

5.Before installing a printhead, shake the printhead up and down at least six times
while the printhead is still in its packaging.
6.Remove the new printhead from its package, and then remove its orange
protective caps.
CAUTION:Do not shake printheads after the caps are removed.
7.Insert the printhead into its color-coded slot (the label on the printhead must match
the label on the printhead latch). Press down firmly on the printhead to ensure
proper contact.
8.Pull the printhead latch all the way...

Store printing supplies
This section covers the following topics:
•
Store ink cartridges
•
Store printheads
Store ink cartridges
Ink cartridges can be left in the device for extended periods of time. If you remove the
ink cartridges, place them in an airtight container, such as a resealable plastic bag.
Store printheads
Printheads can be left in the device for extended periods of time. If you remove the
printheads, place them in an airtight container, such as a resealable plastic bag.
Troubleshooting...

◦Pause Printing is not selected if you are using a computer running Windows.
◦You are not running too many programs when you are performing a task.
Close programs that you are not using or restart the computer before
attempting the task again.
NOTE:Some problems can be resolved by resetting the device.
Solve printing problems
This section contains the following topics:
•
The device shuts down unexpectedly
•
All device lights are on or flashing
•
The device is not responding (nothing prints)
•
Device does...

Check the printhead initialization
When printheads are installed or replaced, the device automatically prints a few
alignment pages to align the printheads. This process takes about 10 minutes. Until
this process is complete, only the automatic alignment pages can be printed.
Check the device software installation
If the device is turned off when printing, an alert message should appear on your
computer screen; otherwise, the device software might not be installed correctly. To
resolve this, uninstall...