Brother DCP-L8400CDN Service Manual page 86

■
Error code 6300
No Waste Toner
Install the Waste Toner Box.
The waste toner sensor detected that no waste toner box was set.
< User Check >
- Re-insert the waste toner box in the correct position.
Step
1 High-voltage power supply PCB
failure
2 Main PCB failure
■
Error code 6400
No Belt Unit
Open the Front Cover, pull out all Drum Units completely and install the Belt Unit.
The registration mark sensor detected that no belt unit was set.
< User Check >
- Re-insert the belt unit.
Step
1 Connection failure of the
registration mark L PCB harness
2 Registration mark L sensor failure
3 Main PCB failure
Cause
Replace the high-voltage power supply
PCB ASSY.
Replace the main PCB ASSY.
Cause
Reconnect the registration mark sensor L
PCB harness.
Replace the registration mark sensor unit.
Replace the main PCB ASSY.
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Remedy
Remedy
Confidential