User`s guide

5.
Replace the clear plastic paper-tension unit by placing the small
pegs into the notches on each side of the printer. Press down
until it locks into place.
2-
6.
Slide the print head back and forth to make sure it can move
freely. If it cannot, the paper-tension unit was incorrectly
installed. Remove it and install it again.
Warning:
Never move the print head while the print is turned on;
this can damage the printer. Also, the print head may become
hot during use. Always let it cool before you touch it.
7.
Replace the printer cover and paper guide.
2-20 Paper Handling