: Clears error codes like 5B00 or 1700 , which indicate the internal ink absorber pads are theoretically full and need replacement.

: Canon does not officially distribute these tools to the public, typically requiring a visit to an authorized service center for hardware-related resets.

Triggers deep hardware test prints not available in standard menus.

: While still holding Power, release the Stop button, then press it 5 times (for some models, this may be 2 or 6 times).

series. It is primarily used by technicians and savvy users to clear critical errors like the "Waste Ink Tank Absorber Full" (Error 5200). Key Functions & Capabilities Ink Counter Reset:

He clicked on one dot. A diagnostic window popped up for a printer in a dentist’s office two streets away. Ink levels. Page counts. Last error: Paper jam, tray 2. Then a new command appeared:

He reached for the USB cable to disconnect. Too late.