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Confidential
■ 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 Cause Remedy
1
Dirt on the registration mark
sensor L
Clean the registration mark sensor L.
2
Failure in printed measurement If failure occurs when printing “K/W/Y/M/
C” in “Function code 71”, refer to “4.3
Troubleshooting for Image Defects” in this
chapter and take a measure.
3
Connection failure of the
registration mark sensor L
harness
Reconnect the registration mark sensor L
harness.
4
Density sensor failure Replace the registration mark sensor L
PCB.
5 Main PCB failure Replace the main PCB.
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