Brother mfc8440 Service Manual page 250
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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-11
Faulty registration
Possible cause
Step
Excessive paper
1
load
Print paper
2
3
Rear registration
4
sensor position
incorrect
I-12
Poor fixing
Possible cause
Step
Print paper
1
Toner sensing
2
failure
(When printing
is faint.)
Fixing unit
3
thermistor
failure
Low-voltage
4
power supply
PCB failure
Check
Is the paper loaded in the
paper tray more than 27mm
high?
Is the specified weight of the
recommended paper being
used?
Is the first printing position
within ±1mm of the tolerance
specification?
Is the rear registration sensor
off from the correct position?
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 low-voltage
power supply PCB?
6-43
MFC-8440/8840D/8840DN, DCP-8040/8045D/8045DN
Result
Remedy
Yes
Instruct the user to keep paper
loads below 27mm in depth.
No
Recommend 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.
Result
Remedy
Yes
Recommend to use the
specified types of paper.
Yes
1) Toner is empty.
2) The toner sensing 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 low-voltage power
supply PCB.
SERVICE MANUAL
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