According to the internet, imageCLASS D420 has been retired. Product support is no longer available. Driver and content updates are not being made. However, it does turn on and so long as you download the program to your computer, it should work. It was used in an office so presumably it works.
More info here: https://www.usa.canon.com/support/p/imageclass-d420?
Canon imageCLASS D420 (Near Ft. Totten Park)
Collection Times
Week days after 5:30 pm or anytime on Saturday
Week days after 5:30 pm or anytime on Saturday
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