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HP Color Laser MFP 178nw

My newly purchase HP Laser MFP178nf multifunction scanner/printer worked perfectly when copying or printing single-sided documents. However, after reversing a printer sheet and replacing it for printing on its reverse side, the paper emerged folded over in a corner with creases over the entire document. I could find no foreign bodies or jammed paper in the machine. I solved the problem by performing a hard reset by:

- disconnecting the printer by removing the power lead WITH THE PRINTER STILL SWITCHED ON.

Waiting for 3 minutes

Pressing the ON/OF power button for 30 seconds

Reconnecting the power lead from a wall socket direct into the machine - NOT via extender or power filter.

Switched back on and worked perfectly on both single- and double-sided printing.

 

Perhaps I should add that I first operated the printer after unboxing and removing adhesive tape  and other items as indicated on the setup diagrams quite successfully. However, after printing a few documents a narrow strip of cardboard fell out which had writing on it to say that "it should exit the machine when printing the first page". - which obviously didn't happen! This is not mentioned on the setup diagram sheet.

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