Brother DCP-7090 Service Manual page 93

 Error code 4F01
The new toner sensor of the toner cartridge could not detect a new cartridge properly.
<User Check>
• Replace the toner cartridge with a new toner cartridge again.
• If the machine is on the uneven surface, place it on a level surface.
Step
Connection failure of the new
1
toner sensor PCB harness
New toner actuator coming off or
2 caught in some sections of the
machine
3 New toner sensor failure
4 Main PCB failure
 Error code 4F05
New process sensor could not detect the new drum unit correctly.
<User Check>
• Replace the drum unit with a new drum unit again.
• If the machine is on the uneven surface, place it on a level surface.
Step
High-voltage power supply PCB
1
failure
2 Main PCB failure
 Error code 5E00
New toner box sensor could not detect the new toner box correctly.
<User Check>
• Replace the toner box with a new toner box again.
• If the machine is on the uneven surface, place it on a level surface.
Step
New toner box sensor failure
1
2 Main PCB failure
Cause
Cause
Cause
2-53
Remedy
Reconnect the new toner sensor PCB
harness.
Reattach the new toner actuator.
Replace the new toner sensor PCB ASSY.
Replace the main PCB ASSY.
Remedy
Replace the high-voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Remedy
Replace the high-voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
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