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Machine Error 78 indicates a mechanical malfunction of the Brother MFC-8840D. 78 represents the error number. You have to contact Brother Customer Service 1-877-BROTHER.
That error happens when the left hinge in the back breaks and the scanner cover won't shut all the way. temporarily you can tape the switch that is above the hinge and when the error is gone the modes should change again. The hinge is #LP2403001.
you configure your printer adf insert paper adf congigure copy quantity button press print key then make copy how much quantity
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Open ADF and close again. There must be tab in the ADF which is not pressing a microswitch located in the lower part of the ADF. IF you can locate it, try pressing it manually.
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