With my experience and having ran into this a few times with customer systems, in 1903/1909 and 2004 there's an update that breaks Brother, Ricoh and other printer functionality.
The updates causing the trouble are KB4560960 for Windows 10 and Server 1903 (build 18362), 1909 (build 18363), and KB4557957 for the 2004 version (build 19041) released on 9 June.
1903 and 1909:
- download and install the Hide and Show Update Troubleshooter
- uninstall KB4560960, restart the PC
- run the Troubleshooter and hide the KB above
- Done!
2004:
- download and install KB4567523
(no need to uninstall the problematic KB4557957); this KB fix won't be pushed to Windows Update until July
- Done!