Inkjet Printer Components Yellow Color Not Working On Brother Printer?

Yellow color not working on brother printer? - inkjet printer components

I have a Brother MFC-240C inkjet multifunction printer. Had been stored for some time. After 25 cleanings yellow will not work. My question is, if I open the device in the home, that's exactly what I was thinking the faulty component? In the printer head? This is the print head in the sliding mechanism?