Brother DCP-L8400CDN Service Manual page 79

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Error code 4700
Supplies
WT Box End Soon
The waste toner sensor detected that the waste toner box is almost full.
Error code 4800
Replace WT Box
Replace the Waste Toner Box inside the machine.
After the waste toner sensor detected that the waste toner box was almost full, pages more
than the specified number have been printed.
< User Check >
- Replace the waste toner box.
Step
1 High-voltage power supply PCB
failure
2 Main PCB failure
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Error code 4B01
Supplies
Toner Low:BK
Dot counter of the toner cartridge (Black) or develop roller counter reaches the upper limit soon.
Error code 4B02
Supplies
Toner Low:Y
Dot counter of the toner cartridge (Yellow) or develop roller counter reaches the upper limit soon.
Error code 4B03
Supplies
Toner Low:M
Dot counter of the toner cartridge (Magenta) or develop roller counter reaches the upper limit
soon.
Error code 4B04
Supplies
Toner Low:C
Dot counter of the toner cartridge (Cyan) or develop roller counter reaches the upper limit soon.
< User Check >
- Prepare a new toner cartridge.
Step
1
New toner actuator coming off
2
Connection failure of the new
toner sensor PCB harness
3
Main PCB failure
Cause
Replace the high-voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Cause
Re-assemble the new toner actuator.
Reconnect the toner/new sensor PCB
harness.
Replace the main PCB ASSY.
2-49
Remedy
Remedy
Confidential