HP 2425 - Manual (Page 107)

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1 Lightly press the top center area of the duplexing unit jam
release cover (on the front of the printer) to pop it open.
2 Open it and remove the jammed media.
▲ Caution: Do not force the jammed media out. Otherwise, the
media may tear and leave residual pieces in the duplexing unit.
3 Close the duplexing unit jam release door by pressing it until
it clicks.
4 Open the left cover.