HP LineJet Série Guide De Référence Rapide page 78

Chapter 1
Troubleshooting
4.
Remove the paper from the tractors to check the paper path
and tractors for jammed or torn paper. Remove any pieces of
paper by turning the vertical position knob.
5.
Check that the ribbon mask has not been deformed in such a
way as to block the paper path. If the ribbon mask is damaged
or bent, contact a Hewlett-Packard Customer Service
Engineer.
6.
Gently pull the paper up through the paper slot to get the
jammed paper above the tractors.
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