Uninstall the printer driver in Macintosh.
[Printers & Scanners] screen is opened by clicking the Apple mark and selecting [System Preferences] from [Apple Menu].
The selected printer is deleted.
KOI7100J.ppd
KOI7100_.ppd
Drag the below files from [Library] - [Printers] - [KONICA MINOLTA] and drop them in [Trash].
KOI7100_.ppd
KOIC7100.plugin
KOIC7100.icns
KONICA MINOLTA C7100 Printer Driver x86_64 Preferences
The above files may now show up depending on the driver settings.
[User Name] is set to the account selected when login.