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Hi, I'm Bernard, a fellow Windows user. I'm happy to help!
This issue occurs when there is a miscalibration with the Printer. In this case, I recommend uninstalling all the Brother printer driver-related apps on the PC and reinstalling them from the manufacturer's website. Kindly follow the steps below:
Press the Windows key + R, then type in:
appwiz.cpl
Then hit OK
Look for Brother drivers or software, then right-click and uninstall them.
Restart the PC and check.
Then download the driver from the link below:
https://support.brother.com/g/b/downloadtop.aspx?c=us&lang=en&prod=mfc7840w_all
Use Windows 10 (64-bit), then download Full Driver & Software Package
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.