I see a series of black dots when I print with my Brother printer. If the problem is not solved after printing a few pages, the drum unit may have glue from label stock on the OPC drum surface. To fix this, clean the drum unit. If it is too dirty or damaged replacing the drum unit if your Brother printer is essential.
"Thank you so much, I am really impressed with the response and caring attitude you have taken with my order.
I will be in touch with future orders.
Chuck "The Leatherman" Hartman" (Charles, H.)