These printers use the TK-312 cartridge:

Kyocera-Mita FS 2000 D

Kyocera-Mita FS 2000 DN

Kyocera-Mita FS 3900 DN

Kyocera-Mita FS 4000 DN

Kyocera FS 2000 D

Kyocera FS 2000 DN

Kyocera FS 3900 DN

Kyocera FS 4000 DN

Royal-Copystar FS 2000 D

Royal-Copystar FS 2000 DN

Royal-Copystar FS 3900 DN

Royal-Copystar FS 4000 DN