AR-NB2 (serv.man13). Software setup guide, for AR-NB2 - Sharp Copying Equipment User Guide / Operation Manual. Page 11

To check the IP address of the machine, hold down the status button on the network expansion kit at 
least 2 seconds to print out a Printer Setting List.

To reset the network expansion kit, turn on the power while holding down the status button on the 
network expansion kit.
Network scanner destination information and scanning settings will remain after the network 
expansion kit is reset, however, the network settings and printer settings will revert to the factory 
default settings.