Hi, I can help answer your questions.
The issue is that the printhead may be faulty and require replacement. Since you already removed and cleaned the printhead. The error you get is a problem with the print head and will need to be replaced. You can get a replacement print head from Dell at this link: http://accessories.us.dell.com/sna/DellPartsFamily.aspx?c=us&cs=19&l=en&s=dhs&~ck=anav&category_id=7566&redirect=1&~ck=mn
Please let me know if you need additional help and rate my answer based on your satisfaction. Thank you.