Brother HL-5240 Service Manual page 168

CHAPTER 4 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
(I-21) Horizontal lines
Possible cause
Paper tray
contacts
Drum unit
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 printer'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?
Step Check
1 Are the ground contacts on the
right side of the paper tray
connecting correctly?
2 Are the high-voltage power
supply and drum unit contacted
correctly?
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.
Result
No Clean the contacts.
No Clean the contacts.
4-54
Remedy
Remedy
Remedy
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