I just updated to Windows 10. My MFC-J435w printer prints but will not scan what can I do.

Hi,

As far as I know, this issue usually caused by the printer driver incompatible. We can see the KB of printer provider:

http://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=mfcj435w_us&faqid=faq00003185_000

Then, I do not find the driver for Windows 10 yet, thus, I recommend you re-install the Windows 8.1 driver with Windows 8.1 compatibility mode.

Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

If this issue still exists, please be patient while the printer provider release the new driver over the next little while.

Regards,

George Zhao
TechNet Community Support