Toner Cartridges, Maintenance Kits and Parts

One Item
Black Genuine 2-Pack Toner Cartridge
The 9400 uses a single toner cartridge, OCE 25001878 (OCE B4).
A "Supply Problem" message on the 9400 often means the printer can't read one of the colour cartridges. Turn it off for 30 seconds, then reseat the cartridge for the colour being reported and gently clean its gold chip contacts with a dry cloth. When the warning keeps returning, install a new cartridge in the reported colour and the printer should recognise it.