Brother DCP-L8400CDN Service Manual page 103

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Error code 9803
Calibration
Calibration failed. Press [Retry], and try again.
Density patch measurement ended unsuccessfully during color density adjustment performed
from the control panel.
Error code 9804
Calibration
Calibration failed. Press [Retry], and try again.
Error occurred with the value measured during density sensor sensitivity calibration.
< User Check >
- Check if the toner cartridges are set in the correct order of colors.
- Replace the toner cartridge.
- Replace the drum unit.
- If the belt unit has a scratch, replace it.
- If "WT Box End Soon" is displayed on the LCD and the belt unit has dirt, replace the waste
toner box.
Step
1 Dirt on the registration mark
sensor L
2 Failure in printed measurement
pattern image
3 Connection failure of the
registration mark sensor L PCB
harness
4 Density sensor failure
5 Main PCB failure
Cause
Clean the registration mark sensor L.
If failure occurs when printing "2D3S
YMCBWKW_A" in
refer to
"4.3 Troubleshooting for Image Defects" in
this chapter
Reconnect the registration mark sensor L
PCB harness.
Replace the registration mark sensor unit.
Replace the main PCB ASSY.
2-73
Remedy
"Function code 71",
and take a measure.
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