Brother mfc8440 Service Manual page 256
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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-18
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Possible cause
Step
Print paper
1
Toner sensing
2
failure
(machine side)
Toner cartridge
3
failure
Drum unit failure
4
NOTE:
The following cases increase the possibility of this problem.
• Acid paper is being used.
• The drum unit is at the end of its life.
• There is dust or paper powder.
Check
Does the paper being used
meet the paper specification
(weight, etc.)?
Is the sign "Toner Empty"
displayed on the LCD even
after removing the drum unit
and toner cartridge?
(Be sure to close the cover
after removing the drum unit
and toner cartridge.)
Is the problem solved after
replacing the toner cartridge?
Is the problem solved after
replacing the drum unit?
6-49
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
Result
Remedy
No
Recommend to use the
specified types of paper.
Yes
Recommend to change to
freshly unpacked paper.
Yes
Toner sensor failure. Clean the
toner sensor and check the
toner sensor connection.
Yes
Replace the toner cartridge.
Yes
Replace the drum unit.
No
Replace the high-voltage power
supply PCB.
SERVICE MANUAL
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Troubleshooting
