MX-1800N (serv.man41). System Settings Guide (Supplied as pdf file on m c's Hard Disk Drive). - Sharp Copying Equipment User Guide / Operation Manual. Page 127

The procedures for entering the product keys of the expansion kits are explained below. Touch the [Product Key] key 
and configure the settings.

This setting is used to enter the product key for the PS3 
expansion kit (this allows the machine to be used as a 
PostScript compatible printer).
Enter the product key with the numeric keys and touch 
the [Enter] key.

This setting is used to enter the product key for the 
Internet fax expansion kit.
Enter the product key with the numeric keys and touch 
the [Enter] key.

This setting is used to enter the product key that allows 
use of the metadata send function.
Enter the product key with the numeric keys and touch 
the [Enter] key.

This setting is used to enter the product key that allows 
the machine to be linked to a "standard application".
Enter the product key with the numeric keys and touch 
the [Enter] key.

This setting is used to enter the product key that allows 
the machine to be linked to an "external account 
application".
Enter the product key with the numeric keys and touch 
the [Enter] key.

This displays the serial number that is required to obtain 
the product key.

• Depending on the peripheral devices installed, it may not be possible to use some settings.

• For the product key to be entered, contact your dealer.

When the facsimile expansion kit is installed, this is 
displayed as "E-mail Status".