Brother mfc8440 Service Manual page 244
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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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I-3
Completely blank
User Check
(1) Check for the setting of originals.
Possible cause
Step
Developing bias
1
contact failure
Drum unit
2
Drum unit failure
3
Toner cartridge
4
failure
Scanner
5
harness
connection
failure
Main PCB
6
failure
Laser unit failure
7
CCD unit
8
Check
Are the developing bias
contacts between the machine
body and drum unit dirty?
Are the drum shaft and drum
electrode of the machine
connected correctly?
Is the problem solved after
replacing the drum unit?
Is the problem solved after
replacing the toner cartridge?
Is the scanner harness
connected securely?
(Check if there is any play in
the connection.)
Are printing signals being input
to the laser unit?
Is the problem solved after
replacing the main PCB?
Is the scanner interlock lever
damaged?
Is the scanner mirror broken or
loose?
Is the problem occurring on
CCD replacement?
6-37
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
Result
Remedy
Yes
Clean the electrodes
at both sides.
Yes
Clean the shaft and
the electrode.
No
Check the connection
between the shaft and
the electrode.
Yes
Replace the drum
unit.
Yes
Replace the toner
cartridge with a new
one.
No
Reconnect the
connector correctly.
Yes
Replace the main
PCB.
Yes
Replace the laser unit.
No
Replace the high-
voltage power supply
PCB.
Yes
Replace the CCD.
SERVICE MANUAL
Ground
contacts
(4)
(1)
(1)
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Troubleshooting
