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Brother HL-5440D Service Manual Page 104

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Black horizontal stripes
<User Check>
- Clean inside the machine and the corona wire of the drum unit.
- The paper tray earth spring on the machine side may be dirty.
- This problem may disappear after printing multiple sheets of paper.
- When the horizontal stripes appear at intervals of 45.3 mm, replace
- When the horizontal stripes appear at intervals of 94.2 mm, replace
Step
Dirt on electrodes of the drum unit
1
and those of the machine
Dirt on electrodes of the toner
2
cartridge and those of the machine
Earth wires or earth plate attachment
3
failure (not grounded correctly)
4
Tray earth spring is bent.
Scratches or dirt on the heat unit
5
(horizontal stripes at intervals of
104 mm)
High-voltage power supply PCB
6
failure
Tray earth spring
CAUTION:
• Image defects which appear periodically may be caused by failure of rollers. Refer to
the table below and determine the cause based on the diameter of the rollers or the
pitch at which defects appear in the image.
Diameter of rollers and pitch which appears in the image
No.
1
Developer roller
2
Exposure drum
3
Heat unit in the fuser unit
4
Pressure roller in the fuser unit
Clean it with a dry cloth.
the toner cartridge with a new one.
the drum unit with a new one.
Cause
Fig. 2-9
Part name
2-68
Remedy
Clean the electrodes of the drum unit and those
of the machine. (Refer to
Clean the electrodes of the toner cartridge and
those of the machine. (Refer to
Retighten the screws to secure the earth
wires or earth plate.
Replace the paper tray.
Replace the fuser unit.
Replace the high-voltage power supply PCB
ASSY.
Bottom surface of Paper tray
Pitch at which defects
Diameter
ø 20 mm
ø 30 mm
-
ø 30 mm
Fig. 2-6
or
Fig.
2-7.)
Fig. 2-6
or
Fig.
2-7.)
appear in the image
45.3 mm
94.2 mm
104 mm
94.2 mm
Confidential

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