How do I print a cleaning page on the HP Laserjet Pro 400 MFP M425?
From the Home screen, touch the Setup button, then touch the Service menu, and then touch the Cleaning Page button. Load plain letter or A4 paper when prompted, then touch OK to begin. The product will print the first side, prompt you to reload the page in Tray 1 in the same orientation, and then complete the process — discard the printed page when done. (Page 7)
From the official HP Laserjet Pro 400 Mfp M425 manual, page 7
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