Brother HL-6050 Service Manual page 251

CHAPTER 6 TROUBLESHOOTING
I-18 Gray background
Possible cause
Print paper
Toner sensing
failure
(printer side)
Toner cartridge
failure
Drum unit failure
NOTE:
The following cases increase the possibility of this problem.
• Acid paper is being used.
• The drum unit is at the end of its life.
• There is dust or paper powder.
I-19 Hollow print
Possible cause
Print paper
Step Check
1 Does the paper being used
meet the paper specification
(weight, etc.).
2 Does the "Ready" message
appear on the LCD display
even after removing the drum
unit and toner cartridge?
3 Is the problem solved after
replacing the toner cartridge?
4 Is the problem solved after
replacing the 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?
Result
No Recommend to use the
specified types of paper.
Yes Recommend to change to
freshly unpacked paper.
Yes Toner sensor failure. Clean the
toner sensor and check the
toner sensor connection.
Yes Replace the toner cartridge.
Yes Replace the drum unit.
No Replace the high-voltage power
supply PCB.
Result
Yes Recommend to use the
specified types of paper.
No Refer and compare with I-15.
6-48
Remedy
Remedy