• Code: C3-1312, C3-1315
• Display: Toner Failure: #C1-1311: Install toner again Did not supply enough toner. Reinstall it Shake toner cartridge and then install. Imaging Unit Failure #C3-1312: Install IMG. unit. Imaging Unit Failure #C3-1315: Install IMG. unit.
• Description: The imaging unit does not get enough toner from the toner cartridge. 1. The toner cartridge shutter does not work normally. 2. The imaging unit shutter does not work normally. 3. The toner cartridge seal is not removed. 4. The toner cartridge is not installed properly. 5. The toner is consumed quickly due to a defective image (Background etc.)
• Remedy: 1. Turn the machine off then on. 2. Remove the toner cartridge. Thoroughly roll the cartridge five or six times to distribute the toner evenly inside the cartridge. And reinstall the toner cartridge. 3. Try to print out the sample page more than 20 pages. 4. Check the toner cartridge. - Check if the toner supply shutter between the toner cartridge and the imaging unit works normally. - Remove the seal. Check if the auger rotates normally. - Reinstall the toner cartridge. 5. Replace the toner cartridge. Print out the sample page. 6. Check if the toner supply motor works normally.

• Code: C3-1320, C3-1330
• Display: Imaging Unit Failure #C3-1320: Install IMG. unit. Imaging Unit Failure #C3-1330: Install IMG. unit. Imaging unit is not installed. Install the unit. Did not supply enough toner. Reinstall Toner
• Description: 1. The imaging unit is not installed. 2. The imaging unit is not installed properly.
• Remedy: 1. Install the samsung genuine imaging unit. 2. If the imaging unit is already installed, check the following. a. Reinstall the toner cartridge and imaging unit. b. Check If the CRUM contact is normal. c. After reinstallation, turn the machine off then on.

• Code: C3-1321
• Display: Imaging Unit Failure #C3-1321: Install IMG. unit.
• Description: The position of imaging unit is not normal position, or the imaging unit could not get the normal high voltage. 1. The imaging unit is not installed properly. 2. The contact between the machine and the imaging unit is bad. 3. The imaging unit is defective. 4. The high voltage power circuit or high voltage control circuit of machine is defective.
• Remedy: 1. Remove the imaging unit. Check if the contact terminal is contaminated. Reinstall the imaging unit, and turn the machine of then on. Print 10 sample pages for test. 2. If the problem persists, replace the imaging unit. 3. If the problem persists reinstall or replace the imaging unit, replace the HVPS board or the engine board.

• Code: C3-1411, C3-1412
• Display: Imaging Unit Failure #C3-1320: Install IMG. unit. Imaging Unit Failure #C3-1330: Install IMG. unit. Imaging unit is not installed. Install the unit. Did not supply enough toner. Reinstall Toner
• Description: 1. The imaging unit is not installed. 2. The imaging unit is not installed properly.
• Remedy: 1. Install the samsung genuine imaging unit. 2. If the imaging unit is already installed, check the following. a. Reinstall the toner cartridge and imaging unit. b. Check If the CRUM contact is normal. c. After reinstallation, turn the machine off then on.

• Code: C3-1512, C3-1514
• Display: Imaging unit is not compatible. Check guide Imaging unit is not compatible. Check guide
• Description: The imaging unit is not compatible.
• Remedy: 1. Check information of the imaging unit. 2. If the imaging unit is not a Samsung genuine imaging unit, replace with new one.

• Code: C6-1110, C6-1120
• Display: Replace with new fuser unit Replace with new fuser unit
• Description: The fuser unit is at the end of its life.
• Remedy: 1. Remove the Rear cover and Duplex unit. Replace the fuser unit after removing 4 screws. 2. Tighten 4 screws. Assemble the Rear Cover and Duplex Unit.

• Code: C7-1110, C7-1120
• Display: Waste toner container is almost full. Replace with new one Waste toner container is almost full. Replace with new one
• Description: The waste toner container is full.
• Remedy: Replace the waste toner container with new one.

• Code: C7-1310
• Display: Install waste toner container.
• Description: The waste toner container is full.
• Remedy: Install the waste toner container. If the waste toner container is already installed, remove and reinstall it.