PIXMA GM2040 - paper jammed error but there is no paper

[kmcz]

Hello, we have 10 Canon GM2040 printers. After a few months 3 of them don't working - LED indicates paper jam but there is no jammed paper in the printer.

I think it might just be a dirty sensor or something. How does the printer detect a paper jam? Where can I find the sensor?

[SamanthaW]

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