Toner Replacement Message Displayed On Lcd Is Not Cleared; Drum Error; Drum Replacement Message Displayed On Lcd Is Not Cleared - Brother DCP-7090 Service Manual

4.7.3 Toner replacement message displayed on LCD is not cleared

<User Check>
• Be sure to set a new toner cartridge(or box).
• Check that the genuine toner cartridge(or box) is set.
Step
1
2
3
4
5
6
7
8
9

4.7.4 Drum error

<User Check>
• Clean the corona wire of the drum unit.
• Replace the drum unit with a new one.
Step
1
2
3
4

4.7.5 Drum replacement message displayed on LCD is not cleared

<User Check>
• Reset the drum counter according to the manual.
Step
1
Cause
New toner actuator coming off
Connection failure of the new
toner sensor PCB harness
(Models without toner box)
Connection failure of the new
toner box sensor PCB harness
(Models with toner box)
Connection failure of the
toner box relay PCB harness
(Models with toner box)
New toner sensor PCB failure
(Models without toner box)
New toner box sensor PCB
failure
(Models with toner box)
Toner box relay PCB failure
(Models with toner box)
High-voltage power supply
PCB failure
Main PCB failure
Cause
Dirt on the electrodes of the
drum unit and those of the
machine
Dirt on the electrodes of the
high-voltage power supply
PCB and those of the machine
High-voltage power supply
PCB failure
Main PCB failure
Cause
Main PCB failure
Reattach the new toner actuator.
Reconnect the new toner sensor PCB
harness.
Reconnect the new toner box sensor PCB
harness.
Reconnect the toner box relay PCB harness.
Replace the new toner sensor PCB ASSY.
Replace the new toner box sensor PCB
ASSY.
Replace the toner box relay PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Clean the electrodes of the drum unit and
those of the machine. (Refer to
56) and Fig. 2-13
Clean the electrodes of the high-voltage
power supply PCB and those of the machine.
Replace the high-voltage power supply PCB
ASSY.
Replace the main PCB ASSY.
Replace the main PCB ASSY.
2-102
Remedy
Remedy
Fig. 2-12 (P2-
(P2-56).)
Remedy
Confidential