Lexmark C520 - Manual (Page 123)

Installing an optional memory card
123
Installing and removing options
3 Tighten the screws firmly.
Installing an optional memory card
The system board has one connector for an optional memory card.
CAUTION: If installing a memory card after setting up the printer, turn the printer off and unplug the power cord
before continuing.
1 Access the system board (see Accessing the system board).
2 Open both latches on the connector completely.
Warning: System board electrical components are easily damaged by static electricity.
Touch something metal on the printer before touching any system board
electronic components or connectors.