OKI C7500 V2 Benutzerhandbuch

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Network Configuration 7
Self-diagnostic test
With the printer power switched on, press the push-button located on
the network interface panel (at the rear of the printer) for more than
three seconds and release. The self-diagnostic test results and
configuration settings are printed.
On the first page of the Network Information that is printed out, under
the heading General Information the MAC Address is given. For
example:
MAC Address  00808784E3F1
From this information:
the Ethernet address is: 00:80:87:84:E3:F1