I have the printer Brother HL 4140 CN and just got this new toner cartridge TN 325 (black) used ink service. Unfortunately, it is not recognized by the printer. It is further reported that I should change the cartridge. The usual preparations, I have carried out properly: safety cap is removed, shaken cassette horizontally and cleaned the corona wires.
If anyone knows a trick to success is with me, I'll be happy to change my vote. Otherwise, I have failed 21,90 invested.