• Code: C1-1110
• Display: Prepare new yellow toner cartridge.
• Description: Toner remained is 5 - 30% of its life.
• Remedy: 1) Open the front cover. 2) Remove the toner cartridge(MLT-D709S). (Toner cartridge with level of “Low” will be exhausted soon.)

• Code: C1-1130, C1-1140
• Display: End of life, Replace with new toner cartridge.
• Description: The toner cartridge is at the end of its life.
• Remedy: 1) Print the supply information report. 2) Check the life remaining of the toner cartridge. 3) If its life is at the end, turn the machine off and open the front cover. 4) Replace the toner cartridge with new one(MLT-D709S).

• Code: C1-1311
• Display: Imaging Unit Failure: #C3-1312. Install imaging unit again
• Description: Toner supply is inefficient or abnormal.
• Remedy: 1) Turn the machine off. Open the front cover 2) Remove the toner cartridge. Shake the toner cartridge horizontally to distribute the toner evenly inside the cartridge. 3) If the problem persists, check the follows. a) Check if the Toner Supply Drive Unit(JC93-00436A) is defective. b) Check if the Toner Duct Drive Unit(JC93-00451A) is defective. 4) If the problem persists, replace the Toner cartridge(MLT-D709S).

• Code: C1-1411
• Display: Toner cartridge is not installed. Install it.
• Description: The toner cartridge is not installed. / The CRUM data is not detected.
• Remedy: 1) Open the front cover. Check if the toner cartridge is installed. 2) Remove and reinstall the toner cartridge. 3) If the problem persists, check if the toner cartridge modular jack is contaminated or deformed. 4) Replace the toner cartridge with a new one(MLT-D709S).

• Code: C1-1512
• Display: Toner cartridge is not compatible. Check users guide.
• Description: Toner cartridge is not compatible.
• Remedy: 1) Open the front cover. Remove the toner cartridge and re-install. 2) Print the supply information report. Check the toner cartridge information. 3) If the toner cartridge is not a Samsung genuine, replace it with a new one(MLT-D709S).

• Code: C3-1110, C3-1130, C3-1140
• Display: Prepare new imaging unit Replace with new imaging unit.
• Description: The Imaging unit has almost reached the end of life.
• Remedy: 1) Open the front door and remove the waste toner container. 2) Remove the drum unit. 4) If its life is at the end, turn the machine off and replace the imaging unit(MLT-R709) with new one.

• Code: C3-1211
• Display: Imaging Unit Failure:#C3-1211. Please turn off then on.
• Description: Sensor calibration error that detects the toner density for image stabilization control has occurred.
• Remedy: 1) Open the front door and remove the waste toner container. 2) Remove the drum unit and reinstall. 4) If the problem persists, replace the imaging unit(MLT-R709) with new one.

• Code: C3-1411
• Display: Imaging unit is not installed. Install the unit.
• Description: The imaging unit is not installed. / The data of CRUM is not detected.
• Remedy: 1) Open the front door and remove the waste toner container. 2) Remove the drum unit and reinstall. 3) If the problem persists, replace the imaging unit(MLT-R709) with new one.