HP Deskjet 642c Printer - Manual (Page 5)

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3 Plug the other end into the computer and tighten the screws.
Step 3: Plug in the power cord
1 Leave the computer and the printer turned off.
2 Plug the power adapter cord firmly into the connector on
the back of the printer.
3 Plug the appropriate end of the power cord into the power
adapter.
4 Plug the other end of the power cord into an electrical
outlet.
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4
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Note: Always use the Power button on the front of the
printer to turn the printer on and off. Using a power strip,
surge protector or a wall outlet switch to turn the printer on
and off may cause premature failure.