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# External Options

This section provides explanations about external options.

1. Paper feed unit

   Holds up to 550 sheets of paper. Up to two units can be stacked.

2. Paper feed unit with the casters

   Holds up to 550 sheets of paper. Stack the paper feed unit with the casters to the bottom of the machine. To set the machine directly on the floor, install this unit to the bottom of the machine.

- Install the options in recommended order. For details, see “Order of Option Installation”.

- For details about how to install the paper feed unit, see “Installing the Paper Feed Unit (Optional)”.

- Order of Option Installation

- Installing the Paper Feed Unit (Optional)