Vertical Streaks - Brother MFC-9130CW Service Manual

■ Vertical streaks

Step
1 Dirt in the paper feed system
2 FG wires and FG plate
installation failure (Grounding
is not performed properly)
3 LED ASSY failure
4 Scratch and dirt on fuser unit
Note:
If the machine continuously prints the same pattern including vertical streaks in particular,
black vertical streaks may appear on the paper since the electrostatic performance of the
exposure drum is decreased temporally.
<User Check>
- Clean the corona wire of each drum unit for all four
colors.
- Return the cleaning tab of the corona wire to the
position.
- This symptom might stop occurring after making
several prints.
- Refer to the User's guide and remove the dirt on the
exposure drum using a cotton swab.
- Replace the drum unit or toner cartridge with a new
one.
- Clean the LED ASSY.
- Open the joint cover ASSY and the back cover, and
leave them for 30 minutes or longer to draw moist air
and prevent condensation.
Cause
Tray ground spring
Paper tray
Fig. 2-13
2-94
Remedy
Wipe dirt off.
Retighten the screws that hold the FG wires
and FG plate.
Repair the bend of the tray ground spring of
the paper tray.
Replace the LED ASSY.
Replace the fuser unit.
<Bottom of paper tray>
Confidential