Brother Facsimile Equipment MFC7420 - Manual (Page 234)

Confidential 9-46
I-23 Ghost
User Check
(1) Check the paper used meets the recommended paper specifications.
Damp paper, thick media or rough surfaced paper can cause the problem.
(2) Check the printer’s environment. High temperature and high humidity
conditions can cause the problem.
(3) Check that the appropriate media type is selected in the printer driver.
(4) Try installing a new drum unit.
Possible cause Step Check Result Remedy
Driver setting 1 Is thin paper such as
64g/m
2 used under the
thick paper mode?
Yes 1) Change the current mode to the
normal mode from the driver
setting.
2) Print 5 or 6 blank pages if this
problem occurs.
Drum unit
failure 2 Is the problem solved after
replacing the drum unit? Yes Replace the drum unit.
High-voltage
power supply
PCB failure 3 Is the problem solved after
replacing the high-voltage
power supply PCB? Yes Replace the high-voltage power
supply PCB.
I-24 Toner specks
User Check
(1) Check the paper used meets the recommended paper specifications. A
rough surfaced paper may cause the problem.
(2) The toner cartridge may be damaged. Install a new toner cartridge.
(3) The drum unit may be damaged, or may be nearly at the end of life.
Install a new drum unit.