Lexmark Optra S1625 User Manual page 303

Installing Options
6
Rotate the output expander tray upward from the front
the upper tabs on the tray into the upper
and slide
slots on the output expander
. The tabs click in place.
Note: At this point, you may attach another output expander to
the output expander you just installed. To do this, complete
step 3 on page 284 again, but install the mounting brackets
of the second expander into the mounting slots on the first
output expander you installed. Complete step 4 on page 286
to step 6 on page 287 to install the second output expander
tray.
287
Output Expanders