Vertical Streaks - Brother FAX-2840 Service Manual

Vertical streaks

Step
1 Dirt in the paper feed system
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) Create a completely black pattern as shown below using Microsoft Word,
PowerPoint or other application, and print it on the paper set in the paper tray.
2) Set this paper in the paper tray with the printed surface (all black) facing down.
3) Print a completely white pattern on it.
4) Print any image on another sheet of paper and check that there is no dirt on the
paper.
5) If there is dirt on the paper, repeat steps 2) to 4).
6) When dirt still appears even after steps 2) to 4) are repeated several times, replace
the fuser unit.
Black vertical streaks in a light background
<User Check>
- Clean inside the machine and the corona wire of the drum unit.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
<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.
- The corona wire cleaning lever is not at the home position.
Cause
100% black
All-black
100% white
All-white (no data)
2-70
Remedy
Wipe off the dirt.
Clean the heat roller in the following procedures.
Replace the fuser unit.
Confidential