Brother MFC-8220 Service Manual page 218

CHAPTER 6 TROUBLESHOOTING
I-11
Possible cause
Excessive paper
load
Paper
Rear registration
sensor position
incorrect
I-12 Poor fixing
Possible cause
Paper
Toner sensor
failure
Fixing unit
thermistor
failure
Low-voltage
power supply
PCB failure
Faulty registration
Step
1 Is the paper loaded in the
paper tray more than 27mm
high?
2 Is the specified weight of the
recommended paper being
used?
3 Is the first printing position
within ±1mm of the tolerance
specification?
4 Is the rear registration sensor
off from the correct position?
Step
1 Is thick paper of more than 158
2
g/m being used?
2 Is the problem solved by
replacing the drum unit or the
toner cartridge?
3 Is the thermistor fitted
correctly?
4 Is the problem solved by
replacing the low-voltage
power supply PCB?
Check Result
Check Result
Yes
Yes
Yes
6-40
Remedy
Yes Instruct the user to keep paper
loads below 27mm in depth.
No Recommended to use the
specified types of paper.
Yes Adjust the Y offset by using the
utility software supplied.
Yes Reposition the sensor to the
correct position.
Remedy
Recommend to use the
specified types of paper.
1) If toner is out, replace the
toner cartridge.
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.
Replace the low-voltage power
supply PCB.