In The Multi-Purpose Tray; Inside The Printer - Samsung CLP-550 Setup Manual

In the Multi-purpose Tray

'Jam0 In MP Tray' appears on the display when you print using
the Multi-purpose Tray and the printer detects that there is
either no paper or the paper is improperly loaded.
If the paper is not feeding properly, pull the paper out of the
printer.
To resume printing, open and close the right cover.

Inside the Printer

If paper is jammed inside the printer, 'Jam Inside Printer'
appears on the display.
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Using the handle, open the right cover.
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OLVING ROBLEMS