Brother DCP-L8400CDN Service Manual page 137

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Faint print
Step
1 Laser unit failure
2 Fuser unit failure
3 Main PCB failure
< User Check >
- Check that the machine is set on a level surface.
- Wipe the scanner windows of the laser unit with a soft,
lint-free cloth.
- Replace the drum unit with a new one.
- Replace the toner cartridge with a new one.
Cause
Replace the laser unit.
Replace the fuser unit.
Replace the main PCB ASSY.
2-107
Remedy
Confidential