One Color Is Light - Brother HL-3040CN Service Manual

■ One color is light

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User Check
- Open and close the top cover and make print again.
- Check the machine's environment. High temperature and high humidity or low temperature
and low humidity conditions can cause this problem.
- Replace the toner cartridge or drum unit with a new one.
- Adjust the color density from the control panel cover ASSY.
Step Cause
1 Dirt on exposure
drum electrode
2 Dirt on develop
roller electrode
3 Dirt on belt unit
electrode
4 Dirt on LED array
5 Lifting of LED
ASSY
6 Toner/new sensor
PCB failure
7
Check
Are the electrodes on
the drum unit of the
appropriate color and
machine body dirty?
Are the electrodes on
the develop roller of the
appropriate color and
machine body dirty?
Are the electrodes on
the belt unit of the
appropriate color and
machine body dirty?
Is the LED array of the
appropriate color dirty?
Is printing of the LED
ASSY test pattern
correctly done in
"Function code 68"?
After replacing the toner
cartridge of the
appropriate color with a
new one, does the
same problem occur
even after printing sev-
eral pages?
Does the machine start
printing even after
removing the toner
cartridge of the
appropriate color from
the drum unit?
3-58
Remedy
Result
Yes Clean both electrodes.
(Refer to Fig. 3-3
(P3-32) and Fig. 3-6
(P3-33))
Yes Clean both electrodes.
(Refer to Fig. 3-3
(P3-32) and Fig. 3-6
(P3-33))
Yes Clean both electrodes.
(Refer to Fig. 3-4
(P3-32) and Fig. 3-6
(P3-33))
Yes Wipe the dirt off with a
clean, soft, and lint-free
cloth.
No Re-assemble the
LED ASSY.
No Replace the toner
cartridge of the
appropriate color.
Yes - Check the harness
connection of the
toner/new sensor
PCB ASSY of the
appropriate color.
- Replace the toner/
new sensor PCB
ASSY of the
appropriate color.
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