Macintosh
Overview
Uninstall the printer driver in Macintosh.
Procedure
1
Click [System Settings], and then click [Printers & Scanners].
2
Select the name of the printer you want to delete and click [Remove Printer].
Clicking this button displays a dialog box. Then, click [Remove Printer]; you can delete the selected printer.
3
Close [Printers & Scanners] screen.
4
Drag the below files from [Library] - [Printers] - [PPDs] - [Contents] - [Resources] on the HDD to which the printer driver has been installed, and drop them in [Trash].
KOI140C-1J.ppd
KOI140C-1_.ppd
5
Drag the below files from [Library] - [Printers] - [GENERIC] and drop them in [Trash].
pstoKOI140C-1
KOI140C-1.plugin
KOI140C-1.icns
6
Click Move from the Finder menu. Hold down the option key and click [Library]. Drag the below files from [Preferences] and drop them in [Trash].
XXX 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.
7
Restart your PC.
in the upper-right of a page, it turns into 
and is registered as a bookmark.