Lexmark 3200 - Manual (Page 45)

Copy error messages
40
Close Door Message appears in the top line of the control panel display. Toner
cartridge door is open. This message does not display for all scanner and
printer combinations.
No Duplex Option
Installed
Message appears if user presses Duplex on the MFP control panel, but
the duplex option is not installed correctly on the printer.
Check printer documentation for information about installing the duplex
option.
Error Description