This video shows the steps to change the wireless access point on the ScanSnap iX1600/iX1500.
There are two ways to change the wireless access point.
- Change it on the touch panel on the iX1600.
- Connect the iX1600 to the computer via USB and change the wireless access point from ScanSnap Home.
[Configuration Environment]
Windows 10
ScanSnap Home
Please refer to ScanSnap Help 
for the procedure to connect to a wireless access point.