How much paper can the HP LaserJet Pro 4004 series hold in total?
The printer supports a maximum input capacity of up to 900 sheets across all trays. This includes 100 sheets in Tray 1, 250 sheets in Tray 2, and an optional 550-sheet third tray. The standard output bin holds up to 150 sheets. (Page 3)
From the official HP Laserjet Pro 4001 4004n DN DW D Printer manual, page 3
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