Vertical Streaks - Brother DCP-7055 Service Manual

■ Vertical streaks

Step
1 Dirt in the paper feed system Wipe dirt off.
2 Dirt on the heat roller
3 Scratch on the heat roller
CAUTION :
• If the machine prints the same pattern, especially including vertical streaks,
continuously, black vertical streaks may appear on the paper since the electrostatic
performance of the exposure drum is decreased temporally.
■ How to clean the heat roller
(1) Make the black pattern as shown in the below figure by the Word, PowerPoint and
other applications.
(2) Put the paper that printed in the procedure (1) into the tray. The side to be printed on
must be face down.
(3) Print it in the state that the printing pattern is all white as shown in the below figure.
(4) Print the arbitrary image, and check whether there is any dirt on the paper.
(5) If there is still the dirt, repeat the procedure (2) to (4).
(6) If repeat the procedure (2) to (4) several times when the dirt is not removed, replace
the fuser unit.
■ Black vertical streaks in a light background
User Check
• This problem may occur with noise which is caused by dirt on the
corona wire in the drum unit. In this case, clean the corona wire.
• If the same problem occurs after printing a few pages, the adhesive
of the label or the like, paper powder or dirt may be attached on the
surface of the exposure drum. Wipe off the dirt on the exposure
drum. (Refer to User's guide, and perform the Drum Cleaning.)
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
Cause
Clean the heat roller in the following procedures.
Replace the fuser unit.
100% Black
All-black
100% White
All-white (In the state without data)
User Check
• Clean the inside of the machine and the corona wire in the drum unit.
• Replace the drum unit with a new one.
• Replace the toner cartridge with a new one.
2-85
Remedy
Confidential