IBM S544-5343-03 - Manual (Page 183)

9. Facing the back of the printer, insert the locating hook on the paper output bin into
the far right ventilating slot located on the top right of the printer. Carefully seat the
paper output bin onto the printer, taking care to align the plug on the paper output
bin with the corresponding receptacle on the top of the printer.
10. Make sure the paper output bin is correctly aligned and firmly seated on the top of
the printer.
Chapter 7. Installing Printer Options 163