HP 220240 - Manual (Page 180)

3. Press the release button forward and then down.
— The top cover releases and opens slightly.
MLO-005118 (Figure 7-27; 15.5 picas)
4. Open the top cover to its halfway position.
MLO-004893 (Figure 7-28; 14.5 picas)
7–24 Operator’s Guide