Epson 4500 - Manual (Page 32)

Assembling the Printer
3. Hold the ribbon cartridge by its handles and push it firmly down
into position, making sure the plastic hooks fit into the slots.
Note: Press lightly on both ends of the cartridge to make sure the
plastic hooks are properly seated.
4. Use a pointed object, such as a ball point pen, to guide the ribbon
between the print head and ribbon guide while you turn the
ribbon-tightening knob to help feed the ribbon into place.
1-10 Setting Up the Printer