Press the [Menu] key, and then select setting items using the [ ] or [ ] key.
Disconnect communication cables connected to the printer.
Log in as the machine administrator from the control panel.
Select [Security Options] Press [OK]
Select [Erase All Memory] Press [OK]
Select the method of erasing the data from [NSA], [DoD], or [Random Numbers]. Press [OK]
If you select [Random Numbers], proceed to Step 6.
If you select [NSA] or [DoD], proceed to Step 7.
Enter the number of times that you want to overwrite. Press [OK]
Select [Yes].
When overwriting is completed, press [Exit], and then turn off the main power.
Before turning the power off, see "Turning On/Off the Power", Operating Instructions.