Canon Service Tool V.3900 ~repack~ Download May 2026

The Power light should stay solid green. If it blinks, other errors are present and must be cleared first.

It allows users to read and print EEPROM data to diagnose underlying hardware issues. Canon Service Tool V.3900 Download

With the printer off, hold Resume/Stop , then press and hold Power . While holding Power, press Resume/Stop 5 times (6 for some MG models), then release both. The Power light should stay solid green