GCC Printers 21 Series - Manual (Page 66)

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4. Remove the paper tray from the
printer.
5. Lift the printer up vertically and lower it
onto the optional paper feeder. Align
the five posts on the feeder with the
corresponding holes on the bottom of
the printer.
Be sure to lower the printer gently, as
lowering it too quickly may damage the
printer or feeder.
6. Insert the three supplied screws into
the holes inside of the paper feeder as
shown to secure the feeder to the
printer.