Brother mfc8440 Service Manual page 245
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Also See for mfc8440:
- User manual (426 pages) ,
- Software user's manual (183 pages) ,
- Quick setup manual (52 pages)
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CHAPTER 6 TROUBLESHOOTING
I-4
All black
Possible cause
Corona failure
Harness
connection
High-voltage
power supply
PCB failure
Main PCB
failure
CCD unit
User Check
(1) Clean the corona wire of the drum unit.
(2) The drum unit may be damaged. Install a new drum unit.
Step
Check
1
Is the corona wire dirty?
2
Is the corona wire broken?
3
Are the charge electrodes
between the machine and the
drum unit dirty?
4
Is the laser unit connected to
the main PCB correctly?
5
Is the problem solved after
replacing the high-voltage
power supply PCB?
6
Is the problem solved after
replacing the main PCB?
7
Is the problem occurring on
CCD replacement?
Result
Yes
Clean the corona wire
with the wire cleaner.
Yes
Replace the drum
unit.
Yes
Clean both electrodes.
No
Connect the harness
between the laser unit
and the main PCB
correctly.
Yes
Replace the high-
voltage power supply
PCB.
Yes
Replace the main
PCB.
Yes
Replace the CCD.
6-38
Ground
Remedy
contacts
(2)
(3)
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Troubleshooting
