Brother HL 5370DW, Service Manual

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3-42 Confidential
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<User Check>
- Clean the scanner windows of the laser unit with a soft lint-free cloth.
(Refer to Fig. 3-6. )
- Replace the toner cartridge with a new one.
- Check the machine’s environment. High temperature and high
humidity conditions can cause this problem.
- Damp (wet) paper might be used. Try to change to freshly unpacked
paper.
- Check if there is no dust in the gap between the toner cartridge and
drum frame.
Step Cause Check Result Remedy
1
Condensation Has condensation
occurred inside the
machine?
Yes
Try to print several pages
or leave the machine 2
hours to allow it to reach
room temperature.
2
Transfer failure Is the transfer roller
scratched?
Yes
Replace the drum unit.
3
Scanner
windows of laser
unit failure Is the problem solved
after replacing the laser
unit?
Yes
Replace the laser unit.
<User Check>
- Check that the appropriate media type is selected in the printer
driver.
- The problem may disappear by itself. Try printing multiple pages to
clear this problem especially if the machine has not been used for a
long time.
- The drum unit may be damaged. Replace the drum unit with a new
one.
Step Cause Check Result Remedy
1
Toner cartridge
electrode contact
failure Are the electrodes on
the toner cartridge and
machine body dirty?
Yes
Clean both electrodes.
(Refer to
Fig. 3-2, Fig. 3-3. )
2
Drum unit
electrode contact
failure Are the electrodes on
the drum unit and
machine body dirty?
Yes
Clean both electrodes.
(Refer to
Fig. 3-2, Fig. 3-3. )