What safety precautions should I follow when using this printer?

Always unplug the printer from wall outlets before cleaning, do not install it near water or use it with wet hands, and install it securely on a stable surface. Also ensure the power cord is in a protected location where no one can trip over it or damage it, and use only the power cord and adapter supplied by HP.

From the official HP Envy 4520 All-in-One Printer manual, page 2

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Answers from the official manual.

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