Dell 2355dn Multifunction Mono Laser Printer - Manual (Page 326)

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Installing an Optional Tray 2
You can increase the paper handling capacity of your printer by installing an optional tray 2. This
tray holds 250 sheets of paper.
1 Power the printer off and unplug all cables from the printer.
2 Remove the packing tape and the tape fastening the optional tray 2 cable from the bottom of
the optional tray 2.
3 Find the location of the paper option tray connector and alignment pins.