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Canon 640 will not load & print from rear tray after installing Serria?

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From Cannon KB : Canon PIXMA MP640

Please Note: There are currently no macOS 10.12 Sierra printer drivers available for PIXMA products. This issue is being investigated and we hope to have these drivers available soon.

I guess you'll either have to wait, or go back to El Capitan.

It's always wise to check compatibility for mission-critical apps & devices before jumping to a new OS.

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