: Authorized technicians use it to run internal tests and print EEPROM information to verify device health.
: Unplug the USB cable, restart the printer, carefully repeat the hardware button sequence to re-enter Service Mode, and try a different USB port. Error Code 002 Canon Service Tool V.3900 Download
: Clears the main and platen waste ink counters back to 0%. : Authorized technicians use it to run internal