HP 2566C - Manual (Page 25)

Pull downward on the paper shield to move it out of the way (Figure
3-4, A) and then open the lower ribbon access cover (Figure 3-4, B).
4. Lower the paper shield.
5. Remove the lower ribbon spool.
Remove the lower ribbon spool from its drive hubs by sliding it to the
left (Figure 3-5).
3-4 PREPARING THE PRINTER FOR OPERATION