Troubleshooting For Toner Cartridge And Drum Unit Problems; New Toner Not Detected; Toner Cartridge Not Detected - Brother DCP-7090 Service Manual

4.7 Troubleshooting for Toner Cartridge and Drum Unit
Problems

4.7.1 New toner not detected

<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

4.7.2 Toner cartridge not detected

<User Check>
• Re-assemble the toner cartridge(or box).
• Replace the toner cartridge(or box) with a new one.
Step
1
2
3
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
New toner sensor PCB failure
(Models without toner box)
New toner box sensor PCB
failure
(Models with toner box)
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.
Replace the new toner sensor PCB ASSY.
Replace the new toner box sensor PCB
ASSY.
Replace the main PCB ASSY.
2-101
Remedy
Remedy
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