Brother MFC9450CDN fix error codes list – Compatible Printer model: Brother MFC9450CDN – Brother MFC9450CDN Error Codes with instructions guide: Code: 20 Description: Laser diode failure (K) Causes: 1 Laser unit harness connection failure. 2 Laser unit failure. 3 Engine PCB failure Remedy: 1 Laser unit harness connection failure Check the two harness connections of […]