Epson 3260 - Manual (Page 20)

Caution:
Never move
the
print head while the printer is turned on; this
can damage the printer. Also, if you have just used the printer,
let the print head cool for a few minutes before you touch it.
3. Turn the ribbon-tightening knob in the direction of the arrow
to remove any slack in the ribbon.
4. Insert the ribbon cartridge into the printer as shown; then
press both sides of the cartridge firmly to fit the plastic
posts into the slots.
1-6 Setting Up the Printer