Brother MFC-8220 Service Manual page 224

CHAPTER 6 TROUBLESHOOTING
I-18 Gray background
Possible cause
Paper
Toner sensor
failure
(machine side)
Toner cartridge
failure
Drum unit failure
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.
Step Check
1 Does the paper being used
meet the paper specification
(weight, etc.)?
2 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.)
3 Is the problem solved after
replacing the toner cartridge?
4 Is the problem solved after
replacing the drum unit?
Result
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.
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Remedy