Dell 2130cn Color Laser Printer - Manual (Page 171)

2. Remove all packaging from the duplexer.
3. Push the side button and open the front cover.
4. Remove the connector cap.
5. Install the duplexer into the inside of the front cover.
NOTE: Ensure that the duplexer is parallel to the front cover when action is being carried out.
NOTE: Align the groove on the right tip of the duplexer to the projection on the front cover. Align the arrow mark on the left tip of the duplexer to
the arrow mark on the front cover.
NOTE: Align the connector on the right side of the duplexer to the connector on the front cover as shown in the illustration. The guiding rib on the
left side of the front cover needs to be well aligned to the window on the left side of the duplexer.