Brother HL-7050 Service Manual page 262

CHAPTER 6 TROUBLESHOOTING
I-22
Possible cause
Drum unit failure
Drum
connection
failure
High-voltage
power supply
PCB failure
I-23
Possible cause
Driver setting
Drum unit failure
High-voltage
power supply
PCB failure
Light rain
Step Check
1 Is the problem solved after
replacing the drum unit?
2 Is the contact between the
drum unit and printer body
connected correctly?
3 Is the problem solved after
replacing the high-voltage
power supply PCB?
Ghost
User Check
(2) Check the paper used meets the recommended paper specifications. Damp
paper, thick media or rough surfaced paper can cause the problem.
(3) Check the printer's environment. High temperature and high humidity conditions
can cause the problem.
(4) Check that the appropriate media type is selected in the printer driver.
(5) Try installing a new drum unit.
Step Check
1 Is thin paper such as 64g/m
used under the thick paper
mode?
2 Is the problem solved after
replacing the drum unit?
3 Is the problem solved after
replacing the high-voltage
power supply PCB?
Result
Yes Replace the drum
unit.
No Clean contact
electrode both on the
drum unit and in the
printer body.
Yes Replace the high-
voltage power supply
PCB.
Result
2
Yes 1) Change the current mode to
2) Print 5 or 6 blank pages if
Yes Replace the drum unit.
Yes Replace the high-voltage power
supply PCB.
6-52
Ground
Remedy
contact
Remedy
the normal mode from the
driver setting.
this problem occurs.
(8)