Oki C 130n - Manual (Page 166)

166 - C130n User’s Guide
4
Install the duplexer.
Align the duplex option with its
installation position, and then
push down on the bottom of the
duplex option until it locks into
place.
Important!
When attaching the duplex option, attach the bottom of the option
first. If the duplex option is attached incorrectly, it may be
damaged.