Oki ML3410 Handbook page 22

7. Unplug the bottom feed tractor cable and plug the CSF cable into the receptacle on the printer.
The arrow on the plug faces up.
8. Fit the wire rack(s) into the hole(s) on the back of the bins.
9. Slide the output tray into the channels on the sides of the CSF.
This is what the finished product should look like:
ML3410 ( 96-02-07 )