The Service Tool is primarily used when the printer’s internal monitoring systems halt operation due to hardware thresholds. The most common use for the

For the specifically, this tool is used to bypass or reset specific counters that Canon engineers use during servicing. These counters include:

If you reset the counter without cleaning or replacing the waste ink absorber pads, the printer will believe the pads are empty and continue to pump ink into them. Eventually, the pads will overflow, causing ink to leak out of the bottom of the printer, ruining your furniture and potentially short-circuiting the printer’s electronics.

: Release the Stop button (keep Power held down).