The manual mentioned on the dc controller board you should do a backup and restore. Could have firmware issues with main board but does not talk about main board being an issue. I update with usb and this stupid machine makes you do a toner stir after update and I have never had any issues fixed with a software update so I never do it. If you were working on machine you could go back over everything. The picture of the cable and switch showed a white plastic and spring with switch by end of drum with door open. It is good you do not just swap main boards without checking what you need to do.
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