Brother HL-3160CDW Service Manual page 94

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Error code 9803
Density patch measurement ended unsuccessfully during color density adjustment performed
from the control panel.
Error code 9804
An 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
Dirt on the registration mark
1
sensor L
Failure in printed measurement
2
Connection failure of the
3 registration mark sensor L
harness
Density sensor failure
4
5 Main PCB failure
Cause
2-75
Remedy
Clean the registration mark sensor L.
If failure occurs when printing "K/W/Y/M/
C" in "Function code 71", refer to
Troubleshooting for Image Defects" in this
chapter and take a measure.
Reconnect the registration mark sensor L
harness.
Replace the registration mark sensor L
PCB.
Replace the main PCB.
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