It sounds likea problem with your paper stock. Check the following to make sure you are using a paper type that is compatible with your printer.
Plain Paper: Xerox Premier 80 gsm
Xerox Business 80 gsm
Mode DATACOPY 80 gsm
IGEPA X-Press 80 gsm
Recycled paper: Xerox Recycled Supreme
Transparency: 3M CG 3300
Labels: Avery laser label L7163
?? Before you buy a large amount of paper, please test some to make sure that the paper is suitable.
?? Use paper that is made for plain-paper copying.
?? Use paper that is 75 to 90 gsm.
?? Use neutral paper. Do not use acidic or alkaline paper.
?? Use long-grain paper.
?? Use paper with a moisture content of approximately 5%.
Do not use ink jet paper. It may cause a paper jam and damage your MFC.
Choosing acceptable paper
It is recommended that you test paper (especially special sizes and types of paper) on the MFC before purchasing large quantities.
?? Avoid feeding label sheets that are partly used or your MFC will be damaged.
?? Avoid using coated paper, such as vinyl coated paper.
?? Avoid using preprinted or highly textured paper, or paper with an embossed letterhead. For optimum printing, use a recommended type of paper, especially for plain paper and transparencies. For more information on paper specifications, call your nearest authorized sales representative or the place where you purchased your MFC.
?? Use labels or transparencies that are designed for use in laser printers.
?? For the best print quality, we recommend using long-grained paper.
?? If you are using special paper and the paper has problems feeding from the paper tray, try again using the manual feed tray or Multi-purpose tray.
?? You can use recycled paper in this MFC.
The output quality depends on the paper type and paper brand. Visit http://solutions.brother.com
and check the latest recommendations for paper that can be used with the MFC-8840D.