Samsung ML-451 Series Service Manual page 146

4. Alignment and Troubleshooting
► Error Code
C3–1110
C3–1120
C3–1140
► Error message
Prepare new imaging unit.
Replace with new imaging unit.
End of life, Replace with new imaging unit
► Symptom
The remaining life of the imaging unit is less than 10% of its life. / The remaining life of the imaging unit is less
than 0% of its life.
► Troubleshooting method
Check the life remaining of the imaging unit.
If its life is at the end, turn the machine off and replace the imaging unit with new one.
► Error Code
C3–1312
► Error message
Imaging Unit Failure: #C3-1312. Install imaging unit again.
► Symptom
Toner sensor is defective. The machine can't detect the sensor signal in the imaging unit normally.
► Troubleshooting method
1) Install the genuine samsung imaging unit.
2) If the imaging unit is already installed, check the following.
• Reinstall the toner cartridge and imaging unit.
• Check if the CRUM connector is normal.
• Turn the machine off then on.
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