Using the printer control panel
Turn off the printer.
Hold down 2 and 6 while turning the printer on. Release the buttons only when the screen with the progress bar appears.
The printer performs a power-on sequence, and then the Configuration menu appears. When the printer is fully turned on, a list of functions appears on the printer display.
Press the up or down arrow button until Wipe Disk appears, and then select one of the following:
Press the up or down arrow button until Yes appears, and then proceed with disk wiping.
Back > Exit Config Menu
The printer will perform a power‑on reset, and then return to normal operating mode.