QMS 1660 Reference Manual page 143

3 Remove the connector cover on the lower-right rear of the
printer.
Lift the back side of the printer with your left hand, and pull the
connector cover away from the printer.
4 Place the paper feeder on a stable, flat surface, with the cas-
sette installation slot toward you.
5 Pull the green lock levers, located on the right and left of the
paper feeder bottom, toward you to release them.