Brother International MFC-9550 Owners Manual - Page 163

150 C H A P T E R S E V E N T E E N Copy Quality Difficulties Print Quality Difficulties DIFFICULTY SUGGESTIONS Vertical streaks appear in copies. Sometimes you may see vertical streaks on your copies. Either the scanner or the primary corona wire for printing is dirty. Clean them both. Printouts are too dark or light. Adjust the print conditions by setting the Print Density function, It has been factory set to the middle position.See "Setting the Print Density" in chap. 5. Printed pages contain white stripes. White Stripes or Faint lmages You may fix this by wiping the scanner windows with a clean soft cloth. (See "Regular Maintenance" and "Cleaning the Drum Unit" in this chapter.) If you still see white stripes or faint images and the display shows CHANGE DRUM SOON, replace the drum unit with a new one. Printed pages are stained Clean the machine's interior and the primary corona with toner or have vertical wire of toner cartridge. See "Regular Maintenance" and stripes. "Cleaning the Drum Unit" in this chapter. Make sure that the tab of the corona wire is at the home position. If after cleaning, you still see dark stripes or toner stains and the display shows CHANGE DRUM SOON, replace the Dark Stripes or Toner Stains drum unit with a new one. Printed pages have white spots in black text and you graphic areas. Make sure that you use paper that meets the specifications. Rough surface or thick media can cause the problem. If you still see white spots and the display shows CHANGE DRUM SOON, replace the drum unit with a new one. White Spots Toner scatters and stains the printed page. Scattering Toner The whole page is printed black. Black Page Nothing is printed on the page. White page Adjust the print conditions by setting the Print Density function. Clean the machine's interior. See "Regular Maintenance" and "Cleaning the Drum Unit" in this chapter. Make sure that you use paper that meets specifications. See chap. 18. If you still have scattered toner and the display shows CHANGE DRUM SOON, replace the drum unit with a new one. Wipe the electric terminals. Also, do not use heatsensitive paper as it will cause this problem. After cleaning, if the printed pages are still black and the display shows CHANGE DRUM SOON, replace the drum unit with a new one. Make sure that the toner cartridge is not empty. Wipe the electric terminals referring to "Regular Maintenance" and "Cleaning the Drum Unit" in this chapter. Make sure that a torn piece of paper does not remain on the scanner window.