A mulch is any material you place over garden soil to affect either the soil or the plants growing there. Organic mulches are derived from plant materials that eventually decompose and become part of the soil.
To replace or reinstall the waste toner tank: 1  Open the front cover. 2  Pull on the handles to remove the toner cartridge. 3  Pull the waste toner tank out by the handle. 4  With a dry, lint free cloth, clean the inside wall of the printer and clean the waste toner tank.
If the Brother machine displays Replace drum error message, you need to replace the drum unit. [Example 1] The drum unit of monochrome laser model MFC-7840W. [Example 2] The drum unit of color laser model MFC-9840W (four colors). How to use the toner cartridge and the drum unit. To use the consumables, put the toner cartridge into the drum unit.