HP/Canon - Printhead cleaning -- ink tank/printhead permanently installed (modular)

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Clean the printer contacts

THESE STEPS MAY NOT BE REQUIRED ON ALL PRINTERS. If your printhead contact is similar, it is recommended to clean it regardless of the printer manufacturer.
(HP ONLY) Failure to clean this area may result in a Ink System Failure warning, and a lost calibration.
Using an alcohol wipe, clean the printhead interface to avoid any errors relating to poor printhead contact.

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