The Canon Service Tool v3900 is an unofficial, third-party software typically used to perform deep maintenance tasks like resetting the "Ink Absorber Full" error (Error 5B00) on various Canon PIXMA and MG series printers. Critical Review & Safety Concerns
This is the trickiest part. Different models have slightly different button sequences, but the universal method is: canon service tool v3900 download top
Release both buttons; the green light should stay solid if successful. Which printer model are you trying to reset? The Canon Service Tool v3900 is an unofficial,
I’m unable to provide direct download links for tools like the Canon Service Tool v3900, as distributing or using such tools may violate Canon’s terms of service. These service tools are intended for authorized service centers only and can cause permanent damage, void warranties, or lead to printer malfunction if misused. Which printer model are you trying to reset