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(See Paper Type uu page 16 and (for MFC-7240) Software User’s Guide: Basic tab.) • Check the machine’s environment. Conditions such as high humidity can cause hollow print. (See Product Safety Guide: Choosing a location.) • The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum unit uu page 62.) • Clean the corona wire inside the drum unit by sliding the green tab. Be sure to return the green tab to the home position (a). (See Cleaning the corona wire uu page 60.) • The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum unit uu page 62.) • The fuser unit may be contaminated. Call Brother Customer Service. All black ABCDEFGH abcdefghijk ABCD abcde • Make sure that you use paper that meets our specifications. A rough surfaced paper or thick print media can cause problems. • Make sure that you choose the appropriate media type in the printer driver (for MFC-7240) or in the machine’s Paper Typemenu setting. (See Acceptable paper and other print media uu page 16 and (for MFC-7240) Software User’s Guide: Basic tab.) White lines across the page 01234 • The problem may disappear by itself. Print multiple pages to clear this problem, especially if the machine has not been used for a long time. • The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum unit uu page 62.) ABCDEFGH abcdefghijk ABCD abcde 01234 • Clean the corona wire of the drum unit. (See Cleaning the corona wire uu page 60.) • Clean the drum surface. (See Advanced User’s Guide: Cleaning the drum unit.) • The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum unit uu page 62.) Lines across the page 94 Troubleshooting Examples of poor print quality Recommendation White lines, bands or ribbing across the page • Check the machine’s environment. Conditions such as high humidity and high temperatures may cause this print quality problem. (See Product Safety Guide: Choosing a location.) • If the problem is not solved after printing a few pages, put in a new drum unit. (See Replacing the drum unit uu page 62.) White Spots on black text and graphics at 94 mm (3.71 in.) intervals 94 mm (3.71 in.) 94 mm (3.71 in.) • Make ten copies of a blank, white sheet of paper. (See How to copy uu page 45.) If the problem is not solved, the drum unit may have glue from a label stuck on the OPC drum surface. Clean the drum unit. (See Advanced User’s Guide: Cleaning the drum unit .) • The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum unit uu page 62.) Black Spots at 94 mm (3.71 in.) intervals 94 mm (3.71 in.) 94 mm (3.71 in.) B 95 Examples of poor print quality Recommendation ABCDEFGH abcdefghijk ABCD abcde 01234 • If you use label sheets for laser printers, the glue from the sheets may sometimes stick to the OPC drum surface. Clean the drum unit. (See Advanced User’s Guide: Cleaning the drum unit) • Make sure that you use paper that meets our specifications. (See Acceptable paper and other print media uu page 16.) • Do not use paper that has clips or staples because they will scratch the surface of the drum. Black toner marks across the page • If the unpacked drum unit is in direct sunlight or room light, the unit may be damaged. • The toner cartridge may be damaged. Put in a new toner cartridge. (See Replacing the toner cartridge uu page 55.) • The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum unit uu page 62.) Black lines down the page Printed pages have toner stains down the page. ABCDEFGH abcdefghijk ABCD abcde 01234 • Clean the corona wire inside the drum unit by sliding the green tab. (See Cleaning the corona wire uu page 60.) • Make sure the green tab of the corona wire is at the home position (a). • The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum unit uu page 62.) • The toner cartridge may be damaged. Put in a new toner cartridge. (See Replacing the toner cartridge uu page 55.) • The fuser unit may be contaminated. Call Brother Customer Service. White lines down the page ABCDEFGH abcdefghijk ABCD abcde 01234 • The toner cartridge may be damaged. Put in a new toner cartridge. (See Replacing the toner cartridge uu page 55.) • The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum unit uu page 62.) • Check if the Toner Settings of Replace Toner is Continue (Continue mode), by pressing Menu, 1, 7. (See Advanced User’s Guide: Toner Settings.) • Make sure that foreign material such as a torn piece of paper, sticky notes or dust is not inside the machine and around the drum unit and toner cartridge. 96 Troubleshooting Examples of poor print quality Recommendation Page skewed ABCDEFGHabcdefghijkABCDabcde01234 • Make sure that the paper or other print media is loaded properly in the paper tray and that the guides are not too tight or too loose against the paper stack. • Set the paper guides correctly. (See Loading paper uu page 9.) • If you are using the manual feed slot, see Loadi...

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