Brother FAX-2820 Service Manual page 219

I-12 Poor fixing
Possible cause Step
Print paper 1
Toner sensor 2
failure
(When
printing is
faint.)
Fixing unit 3
thermistor
failure
High-voltage 4
PS PCB
failure
Check
Is thick paper of more than
43lb being used?
Is the problem solved by
replacing the drum unit or
the toner cartridge?
Is the thermistor fitted
correctly?
Is the problem solved by
replacing the high-voltage
power supply PCB?
9 -3 8
Result Remedy
Yes Recommend to use the specified
types of paper.
Yes 1) Toner is empty.
2) The toner sensor is defective.
Clean the toner sensor.
3) If the wiper in the toner
cartridge is broken, replace the
toner cartridge with a new one.
No Fit the thermistor correctly.
Yes Replace the high-voltage power
supply PCB.
Confidential