HP Officejet Pro 251dw Printer series - Manual (Page 59)

NOTE: The printer can operate with one or more depleted cartridges.
However, printing with depleted cartridges slows the printer and affects the
quality of printed documents. If the black cartridge is depleted, blacks are not
as dark. If a color cartridge is depleted, output is in grayscale. When possible,
replace the depleted cartridge. Do not remove the depleted cartridge until you
have a new ink cartridge available. For information about how to install new
cartridges, see Replace the ink cartridges.
CAUTION: While ink cartridges are not damaged when left outside of the
printer, the printhead does need to have all cartridges installed at all times
after the printer is set up and in use. Leaving one or more cartridge slots
empty for an extended period may lead to print quality problems and possibly
damage the printhead. If you have recently left a cartridge out of the printer
for an extended period, or if you have had a recent paper jam, and have
noticed poor print quality, clean the printhead. For more information, see
Clean the printhead.
For more information, see:
Check the estimated ink levels
Cause: The ink cartridges might have insufficient ink. Printing with depleted
cartridges slows the printer.
If this did not solve the issue, try the next solution.
Solution 3: Contact HP support
Solution: Contact HP support for service.
Go to: www.hp.com/support. This website provides information and utilities that
can help you correct many common printer problems.
If prompted, choose your country/region, and then click Contact HP for
information on calling for technical support.
Cause: There was a problem with the printer.
The printer is making some unexpected noises
You might hear some unexpected noises made by the printer. These are the servicing
sounds when the printer performs automatic servicing functions to maintain the health
of the printhead.
NOTE: To prevent any potential damage to your printer:
Do not turn off the printer while the printer is performing any servicing. If you are
turning off the printer, wait for the printer to come to a complete stop before turning
it off using the (Power button). For more information, see Turn the printer off.
Make sure all ink cartridges are installed. If any of the ink cartridge is missing, the
printer will perform extra servicing to protect the printhead.
Solve printer problems 55