Brother MFC-4300 用户手册

      T R O U B L E S H O O T I N G   A N D   R O U T I N E   M A I N T E N A N C E

The MFC uses a drum unit to create the print images on paper. If the LCD shows 
CHANGE DRUM SOON, the drum unit is nearly at the end of its life. Purchase 
a new drum unit to replace the current one.

Even if the LCD shows CHANGE DRUM SOON, you may be able to continue 
to print without replacing the drum unit for a while. However, if there is a 
noticeable deterioration in the output print quality even before CHANGE 
DRUM SOON is shown, then the drum unit should be replaced. You should 
clean the MFC when you replace the drum unit.

When removing the drum unit, handle it carefully because it contains toner.  
When you replace the drum unit, you should clean the MFC. (See 

, page 15-25.)

For best performance, use only a genuine Brother toner cartridge. The product 
should be used only in a clean, dust-free environment with adequate ventilation.

Just after you have used the MFC, some internal parts of the machine are 
extremely HOT! So please be careful.

The drum unit is a consumable item, and it is necessary to replace it 
periodically. There are many factors that determine the actual drum life, such 
as temperature, humidity, type of paper and toner that you use and the number 
of pages per print job, etc. The drum life is estimated at approximately 20,000 
pages at 20 pages per job and 8,000 pages at 1 page per job. The actual number 
of pages your drum will print may be significantly less than these estimates. 
Because we have no control over the many factors that determine the actual 
drum life, we cannot guarantee a minimum number of pages that will be printed 
by your drum.