20 Most Recent Canon ImageCLASS MF4370dn Laser All-in-One Printer - Page 7 Questions & Answers


E840 is an error detection to the fixing inlet home position sensor.

PS63 (Fixing Inlet sensor) and PS66 (Fixing Inlet HP sensor)

may be caused by a poor connection on the front door switch. Try inspecting & re-seating the connection at the front door open/close switch=
++ make sure the front door is not vibrating away from the front door open/close switch (MSW7).
The door Magnet Action Catch may not properly be holding the door closed.



++ if paper is stuck in unit 1 frame side connector you might get a E840. If no paper is found in the connector check the connector for damage or cracks. Frame side connector assembly (FM2-5091-000).
https://www.instantprintersupport.com/canon-printer-support

Canon imageCLASS... | Answered on Aug 31, 2018


Hi, I have the same problem, did you solve the problem?

Canon imageCLASS... | Answered on Jul 09, 2018

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