What precautions should I take when handling the paper trays on the HP LaserJet Enterprise M507?
Do not extend more than one paper tray at a time, and do not use a paper tray as a step. Keep hands out of paper trays when closing them, and ensure all trays are closed when moving the printer. (Page 4)
From the official HP LaserJet Enterprise M507 Printer manual, page 4
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