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The Service Tool can only interface with the printer when it is in "Service Mode." canon service tool v3900 download top
Many sites bundle this utility with adware or viruses. Only download from trusted printer repair blogs or forums. Here are some top websites where you can
What is currently showing on your printer screen or computer? canon service tool v3900 download top
Releasing all buttons; the power light should remain steady green. Security and Compatibility Warning Official Sources