Brother FAX-2820 Service Manual page 225

I-18
Gray background
Possible cause Step
Print paper 1
2
Toner sensor
failure
(printer side)
Toner 3
cartridge
failure
Drum unit 4
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.
Check
Does the paper being used
meet the paper
specification (weight, etc.)
Is the error indication
displayed when the toner
cartridge and drum unit is
taken out of the machine?
(The front cover is closed.)
Is the problem solved after
replacing the toner
cartridge?
Is the problem solved after
replacing the drum unit?
9 -4 4
Result Remedy
No
Recommend to use the specified
types of paper.
Yes Recommend to change to freshly
unpacked paper.
No 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.
Confidential