Epson 4500 - Manual (Page 33)

Assembling the Printer
5. Slide the print head from side to side to make sure it moves
smoothly. Also check that the ribbon is not twisted or creased.
6. Fit the rear notches of the paper tension unit over the pins of the
printer. Lower the unit, pressing on both sides to lock it in place.
Setting Up the Printer 1-11