You can
disable access from a USB-connected computer. This restricts
non-network access to the product and protects the security of
confidential scanned documents.
Press
the home button, if
necessary.
Select
Settings > General Settings > Printer Settings. You see a screen like
this:
Scroll
down and select PC Connection via
USB.
Select
Disable.
Note: Select
Yes to restart the product. Changes
are not enabled until the product is restarted.