HP OfficeJet Pro L7400 User Manual

NOTE:The ink levels shown are an estimate only. Actual ink volumes may vary.
After removing a cartridge from its package, install it right away. Do not remove a
cartridge from the device for long periods of time.
To find out which ink cartridges work with your device, see 
Supplies.
To replace the ink cartridges
1.Gently pull open the ink cartridge cover.
2.Remove the ink cartridge that requires replacement by grasping it between your
thumb and forefinger and pulling it firmly toward you.
3.Remove the...

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 
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 
Print the print quality diagnostic page.
3.Manually clean the printhead contacts. For more information, see 
Clean the
printheads.
4.Replace the...

1Printer Information: Shows device information (such as the product model number, serial
number, and firmware version number), the number of pages printed from the tray, the ink
level information, and the printhead health status.
2Test Pattern 1: If the lines are not straight and connected, align the printheads. For more
information, see Align the printheads.
3Test Pattern 2: If there are thin white lines across any of the colored blocks, clean the
printheads. For more information, see Clean the...

Calibrate the linefeed
•Control panel: Press the Setup button, select Tools, select Calibrate Linefeed,
and then press OK.
•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.
Clean the printheads
NOTE:Cleaning uses ink, so clean the printheads only when necessary.
The cleaning process takes up to 3.5 minutes. Some noise might be generated in
the...

4.Lift the handle of the printhead (which corresponds to the control panel message)
and use it to 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.
CAUTION:Do not use water.
6.Wipe the electrical contacts on the printhead but do not touch the nozzles.
NOTE:The electrical contacts are small copper-color squares, grouped on
one face of the printhead.
The nozzles are on a different...

CAUTION: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 paper.
8.Clean the electrical contacts in the printhead slot inside the device with a clean,
dry, soft and lint-free cloth.
9.Plug in the power cord and turn on the device. The control panel should indicate
that the printhead is missing.
10.Insert the printhead...

Replace the printheads
NOTE:To find out which printheads work with your printer, see Supplies.
To replace the printheads
1.Open the top cover.
2.If the carriage does not move to the left automatically, press and hold the OK
button for 5 seconds. Wait for the carriage to stop moving.
3.Lift the printhead latch.
4.Lift the handle of a printhead and use it to pull the printhead out of its slot.
Maintain the printheads63
 

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 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.
Clean the device
This section provides instructions for keeping the device in top working condition.
Perform these maintenance...

Clean the exterior
NOTE:Before cleaning the device, turn off the power and unplug the power cord
from the electrical socket.
Use a soft, damp, lint-free cloth to wipe dust, smudges, and stains off of the case. The
exterior of the device does not require cleaning. Keep fluids away from the interior of
the device, as well as from the control panel.
Troubleshooting tips and resources
Use the following tips and resources to resolve printing problems.
• For a paper jam, see 
Clear a jam in the device.
• For...