Troubleshooting For Toner Cartridge And Drum Unit Problems; New Toner Not Detected; Toner Cartridge Not Detected; Toner Replacement Message Displayed On Lcd Is Not Cleared - Brother DCP-L8400CDN Service Manual

4.7 Troubleshooting for Toner Cartridge and Drum Unit
Problems
4.7.1

New toner not detected

< User Check >
- Check if the supplied toner cartridge is installed.
- Be sure to set a new toner cartridge.
- Install a genuine toner cartridge.
Step
1
2
3
4.7.2

Toner cartridge not detected

< User Check >
- Re-assemble the toner cartridge.
Step
1
2
3
4.7.3

Toner replacement message displayed on LCD is not cleared

< User Check >
- Be sure to set a new toner cartridge.
- Install a genuine toner cartridge.
Step
1
2
3
Cause
New toner actuator coming off
Connection failure of the new
toner sensor PCB harness
Main PCB failure
Cause
High-voltage power supply
PCB failure
New toner sensor PCB failure
Main PCB failure
Cause
New toner actuator coming off
Connection failure of the new
toner sensor PCB harness
Main PCB failure
Re-assemble the new toner actuator.
Reconnect the toner/new sensor PCB
harness.
Replace the main PCB ASSY.
Replace the high-voltage power supply PCB
ASSY.
Replace the toner/new sensor PCB ASSY.
Replace the main PCB ASSY.
Re-assemble the new toner actuator.
Reconnect the toner/new sensor PCB
harness.
Replace the main PCB ASSY.
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Remedy
Remedy
Remedy
Confidential