Ricoh Aficio MP 161SPF - Manual (Page 263)

Registering a Protection Code
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7
L
Enter a protection code using the number keys, and then press the {OK}
key.
M
Press [Exit], and then press [End].
N
Press the {OK} key.
O
Press the {User Tools/Counter}.
Note
❒ Specify a protection code of up to eight digits. You can also specify "Pro-
tection" without specifying a protection code.