HP 220240 - Manual (Page 143)

CAUTION:
Do not attempt to remove jammed paper from the top or rear
paper trays by simply pulling the paper out. Pulling the paper from the
printer without releasing it from the fixing assembly first can cause damage
to the printer.
1. Open the top cover by pressing the release button forward and then
down.
— The top cover releases and opens slightly.
MLO-005342 (Figure 6-3; 15.5 picas)
Troubleshooting 6–15