Konica Minolta bizhub C550 - Manual (Page 379)

Utility mode 10
C550 10-73
5
Touch [NO] and enter password (numerical character 4 digits) that is
used in closed network reception after confirming the display of the
cursor in the password input column.
– When [C] (clear) key is pressed, all entered contents are deleted.
6
Touch [OK].
The settings are changed.
7
Touch [Close] until it returns to Fax/Scan screen.