Here are some suggestions from Lexmark as to why the printer will not duplex:
The ability to select duplex printing requires the following:
of duplex option
-The printer must recognize the physical duplex option.
-The duplex option must be recognized by the driver under
Properties > Install Options.
-The selected Paper Type must not
-Cardstock/Extra Heavy Paper.
- -Under Page Layout > More Page
Layout Options, the following options must not be
Some printers and MFPs have the duplex
option built into the physical printer while others require physical connection
of the duplex option or tray. To check for an installed duplex
Print a Menu Settings page and check for DUPLEX
under Device Information > Installed
. (The embedded web server path is Reports > Device
Settings > Device Information > Installed
does not appear as an
installed option, consider the following possible reasons:
-The duplex drawer or tray is not
properly connected to the printer. Try reseating the printer onto the duplex
option so that the duplex option's upper auto-connect connector is properly
aligned with the printer's bottom auto-connect connector. NOTE:
A "982 duplex
error" may also result from this condition.
-Turn the printer off for about 15
seconds, and then turn the printer back on. If the printer was quickly turned
off and on, a low-voltage power condition could prevent the peripheral
from being acknowledged during the initial printer start-up.
-The auto-connect connector is damaged
on the printer or duplex option.
driver recognition of duplex option - reinstall driver.
Hope these suggestions help.