• Code: C3-1422
• Display: Imaging unit is not installed. Install the unit.
• Description: The imaging unit need to clean.
• Remedy: 1) Open the front door and remove the waste toner container. 2) Remove the drum unit and reinstall. 4) If the problem persists, clean the drum unit by charger cleaner. 5) If the problem persists, replace the drum unit.(MLT-R709).

• Code: C3-1512
• Display: Imaging unit is not compatible. Check user's guide
• Description: Imaging unit is not compatible.
• 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.

• Code: C6-1310
• Display: Fuser unit is not installed. Install it
• Description: Fuser unit is not detected.
• Remedy: 1) Turn the machine off. Re-install the fuser unit. Then turn the machine on. 2) If the problemis persists, Print the Supply Information Report and check whether fuser unit life is over. NOTE The fuser unit can print up to 150,000 pages. 3) If the problem persists, replace the Fuser unit(110V : JC91-01049A, 220V : JC91-01050A).

• Code: C7-1110, C7-1130
• Display: Waste toner container is almost full. Order new one. Waste toner container is full. Replace it.
• Description: The life of the waste toner container expires soon or has expired.
• Remedy: 1) Open the front cover and remove the waste toner container. 2) Reinstall the waste toner container. 3) If the problem persists, remove the waste toner container. 4) If the problem persists, replace the waste toner container(MLT-W709).

• Code: C7-1311
• Display: Waste toner container is not installed. Install it.
• Description: The waste toner container is not installed.
• Remedy: 1) Open the front cover and check the waste toner container is installed correctly. 2) Check the waste toner container sensor operates correctly. 3) If the problem persists, remove the waste toner container. 4) If the problem persists, replace the waste toner container(MLT-W709).

• Code: C9-2110, C9-2120
• Display: Replace with new Transfer roller.
• Description: Transfer belt is at the end of its life.
• Remedy: 1) Open the side-cover. 2) Replace the transfer roller(JC95-01520A).

• Code: C9-2220
• Display: TR Failure: #C9-2220. Install transfer roller again.
• Description: The resistance value of the transfer roller is abnormal.
• Remedy: 1) Open the side cover. 2) Replace the transfer roller(JC95-01520A). 3) If the problem persists, replace the HVPS board.

• Code: H1-1311, H1-1312, H1-1313, H1-1314, H1-1315, H1-1317, H1-1318
• Display: Paper jam in Tray 3.
• Description: Paper jam has occurred in tray3. (Pick up unit connection is defective. / Pickup rollers are defective. / Feed sensor is defective.)
• Remedy: 1) Open the DCF Take Away-Cover. Remove the jammed paper. 2) Remove tray3. Remove the jammed paper. Close the DCF Take Away-Cover and insert tray3. 3) If this jam error occurs frequently, check the rollers below. a) Remove the tray3 and tray4. b) Check if the pick up/ reverse/ forward rollers are assembled correctly. c) If the pick up/ reverse/ forward rollers are worn out or contaminated, replace the defective roller(JC93-00540A). 4) If pick up/ reverse/ forward rollers have no problem, check the following. a) Remove the DCF pick up unit1. Check if the feed sensor cable is connected correctly. b) Check if the sensor cable on DCF board is connected correctly. c) If the connection is OK, replace the feed sensor(0604-001381). d) Install the DCF pick up unit1. 5) If the problem persists after checking step 3~4, check the following. a) Remove the DCF pick up unit1. Check if the sensor and actuator are assembled correctly. b) When pushing the pickup lever, check if the pick up rollers are down. c) Replace the DCF pick up unit1(JC93-00513A) or defective part. 6) Check the DCF feed motor. a) Check if the DCF feed motor cable is connected correctly. b) If the connection is OK, replace the DCF feed drive unit(JC93-00447A). 7) Check the DCF pick up motor. a) Check if the DCF pick up motor cable is connected correctly. b) If the connection is OK, replace the DCF pick up drive unit(JC93-00442A).