The Service Tool will only work if the printer is in "Service Mode" . If you try to run the software while the printer is in normal user mode, you will likely receive an error code 005 or 006 from the tool. Follow these steps carefully:
While holding , press and hold down the Power button. The green power LED will light up.
A confirmation message should appear. Turn the printer off and then back on to resume normal printing. Important Safety and Compatibility Notes Service Tools for Canon Printers | PrinterKnowledge Canon Printer Service Tool V3600
To use the tool successfully, you must follow a strict sequence. Failing to enter Service Mode correctly before opening the software can cause the utility to freeze or permanently corrupt your printer's main board. Prerequisites
Turn the printer off but keep it connected to the power and PC via USB. The Service Tool will only work if the
What is flashing on your printer screen?
Before using V3600, open the printer casing, locate the waste ink pads (usually at the far right or beneath the purge unit), and either: The green power LED will light up
Other service tool versions (like V4720 or V4905) for newer models. Service Tools for Canon Printers | PrinterKnowledge