This is the most common error encountered with Service Tool v4905.

Canon inkjet printers utilize internal firmware counters to track the volume of ink used for cleaning cycles and nozzle maintenance. This ink is absorbed by waste ink pads located at the base of the printer. When these counters reach their predefined limits, the printer enters a "Service Error" state (often indicated by error codes 5B00, 5B01, etc.) and ceases function. The Canon Service Tool v4905 is the industry-standard service utility designed to interface with the printer’s firmware to reset these counters and perform diagnostic operations.

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