The Canon Service Tool is a specialized maintenance utility used by technicians to reset internal counters on Canon inkjet printers. Over time, Canon printers keep track of how much ink is flushed into the waste ink absorber pad during cleaning cycles. When the printer estimates the pad is full, it stops working to prevent ink from overflowing.

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The Canon Service Tool is an unofficial (but widely trusted) software application designed to communicate directly with your Canon printer's EEPROM (Electrically Erasable Programmable Read-Only Memory). This chip tracks internal counters, including the waste ink pad counter.