HP Officejet 4620 - The printer is making some unexpected noises

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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 printheads.

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 off the printer.
Make sure all ink cartridges are installed. If any of the ink cartridges are missing,
the printer will perform extra servicing to protect the printheads.