Lexmark 3455 - Manual (Page 16)

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7. Press the option down toward the system board until it snaps into place. Make
sure both metal clips on the connector are fastened and the two pins on the
connector are pushed through the holes in the option. Refer to the figure matching
your printer.
Optra S/Se
Optra K
8. You must have at least 4 MB of installed memory to use the SIMM for IPDS.
Refer to the menu settings page you printed before beginning the SIMM
installation to determine the amount of printer installed memory. Refer to your
printer User’s Guide to install additional user memory and any other options.
After installing additional options, proceed to step 9.
9. Close the printer system board. Refer to your printer User's Guide and follow the
instructions on how to close the Printer System Board. After closing the Printer
System Board, proceed to step 10.
10. Reconnect the printer cables.