HP 2425 - Manual (Page 98)

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5 If nothing prints at all, do an engine test print.
Use a paper clip that has been straightened and insert it gently
into a small square access hole on the right side of the printer
near the back. The printer should print a vertical line test print.
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Understanding how media travels inside the printer helps you better
handle media jams.
After a sheet of media is fed manually or from a tray, cassette, or input
bin, it travels to the toner cartridge where toner is attracted onto the
media by means of the laser beam. Then, the media moves to the fix-
ing assembly area where toner is fused to it. Finally, the media comes
out from either the face-down or face-up tray, depending on the media
delivery selected.