HP Officejet Pro 8500 - To clean the printhead contacts manually

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To clean the printhead contacts manually

After the printheads are installed, you might get a control-panel message telling you
the device will not print. If you receive this message, you might need to clean the
electrical contacts on the printheads and in the device. Make sure there is paper in the
printer before you start.

CAUTION: Electrical contacts contain sensitive electronic components that can
be damaged easily.

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, and then unplug the
power cord from the printer.

3. Lift the printhead latch.

Chapter 11


Maintain and troubleshoot

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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 face of the printhead. Ink will be visible on the

CAUTION: Touching the nozzles can cause permanent nozzle damage.

CAUTION: 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.

Maintain the printheads


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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 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.

11. Where necessary, repeat the steps for the remaining printheads.
12. Pull the printhead latch all the way forward, and then press down to ensure that

the latch is properly engaged. You might have to apply some pressure to engage
the latch.

13. Close the top cover.
14. If the control-panel message remains, repeat the cleaning procedure for the

printhead that corresponds to the message.

15. If the control-panel message remains, replace the printhead which corresponds to

the message.

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