Brother MFC8440D Service Manual page 253

7/13/2019
CHAPTER 6 TROUBLESHOOTING
I-19 Hollow print
Possible cause
Print paper
I-20 Downward fogging of solid black
Possible cause
Toner cartridge
failure
High-voltage
power supply
PCB failure
http://slidepdf.com/reader/full/brother-8840d-service-manual
User Check
(1) Check the paper used meets the recommended paper specifications.
(2) Select the 'Thick paper mode' in the printer driver, or use thinner paper than you
are currently using.
(3) Check the machine's environment, conditions such as high humidity may cause
this situation to occur.
Step Check
1 Is thick paper of more than
43lb being used or extremely
rough surface paper?
Step Check
1 Is the problem solved after
replacing the toner cartridge?
2 Is the problem solved after
replacing the high-voltage
power supply PCB?
Brother 8840D Service Manual
Result
Yes Recommend to use the
specified types of paper.
No Refer and compare with I-15.
Result
Yes Replace the toner cartridge.
Yes Replace the high-voltage power
supply PCB.
6-50
Remedy
Remedy
253/361