GCC Printers 21 Series - Manual (Page 76)

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4. Gently lower the front edge of the
Upper Output Bin into position, inserting
the tab at the front of the tray into the
slot on the printer as shown.
5. Lower the rear of the tray into position,
making sure that the two plastic tabs at
the rear of the tray match up with the
slots in the printer. The tabs should
click securely into place.
6. Close the rear cover, making sure it
latches completely.