• Code: C6230
• Description: Edge thermistor broken The edge thermistor detects less than 41°C / 105.8°F for 1s continuously when the center thermistor detected 100°C / 212°F or more during the warm-up.
• Remedy: Removing foreign material There is foreign material between the fuser unit and the fuser IH unit. Or, foreign material adheres on the heat roller. Remove foreign material if it is on between the fuser unit and the fuser IH unit, or on the heat roller. Then, reinstall the fuser unit. Detaching and reattaching the Fuser Unit 2 Reinstalling the fuser unit The foreign objects adhere on the drawer connection terminal of the fuser unit. Or, the drawer connector is not inserted completely. Clean the drawer connection terminal of the fuser unit. Check the pin of the drawer connector is not bent, and replace the fuser unit if it is bent. If the pin is normal, reinstall the fuser unit so that the drawer connector is securely connected. Detaching and reattaching the Fuser Unit 3 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 4 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . Drawer connector of the fuser unit - Feed image PWB . Feed image PWB - Engine PWB Section 8 "PWBs" 5 Replacing the fuser unit The temperature cannot be detected properly due to the heater broken or the thermistor error. Replace the fuser unit. Detaching and reattaching the Fuser Unit 6 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB 7 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB.

• Code: C6250
• Description: Edge thermistor low temperature error The edge thermistor detected less than 80°C / 176°F for 1s during printing.
• Remedy: 1 Removing foreign material There is foreign material between the fuser unit and the fuser IH unit. Or, foreign material adheres on the heat roller. Remove foreign material if it is on between the fuser unit and the fuser IH unit, or on the heat roller. Then, reinstall the fuser unit. Detaching and reattaching the Fuser Unit 2 Reinstalling the fuser unit The foreign objects adhere on the drawer connection terminal of the fuser unit. Or, the drawer connector is not inserted completely. Clean the drawer connection terminal of the fuser unit. Check the pin of the drawer connector is not bent, and replace the fuser unit if it is bent. If the pin is normal, reinstall the fuser unit so that the drawer connector is securely connected. Detaching and reattaching the Fuser Unit 3 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 4 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . Drawer connector of the fuser unit - Feed image PWB . Feed image PWB - Engine PWB Section 8 "PWBs" 5 Replacing the fuser unit The temperature cannot be detected properly due to the heater broken or the thermistor error. Replace the fuser unit. Detaching and reattaching the Fuser Unit 6 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB 7 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB. 8 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . IH PWB - Engine PWB Section 8 "PWBs" 9 Replacing the IH PWB The IH PWB is faulty. Replace the IH PWB. Detaching and reattaching the IH PWB 10 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . Fuser IH unit - IH PWB Section 8 "PWBs" 11 Replacing the fuser IH unit The fuser IH unit is faulty. Replace the fuser IH unit.

• Code: C6320
• Description: Middle thermistor high temperature error The middle thermistor detected 245°C / 473°F or more for 1s.
• Remedy: 1 Reinstalling the fuser unit The foreign objects adhere on the drawer connection terminal of the fuser unit. Or, the drawer connector is not inserted completely. Clean the drawer connection terminal of the fuser unit. Check the pin of the drawer connector is not bent, and replace the fuser unit if it is bent. If the pin is normal, reinstall the fuser unit so that the drawer connector is securely connected. Detaching and reattaching the Fuser Unit 2 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 3 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . Drawer connector of the fuser unit - Feed image PWB . Feed image PWB - Engine PWB Section 8 "PWBs" 4 Replacing the fuser unit The temperature is not properly detected due to the wire short-circuit or the thermistor error in the fuser unit. Replace the fuser unit. Detaching and reattaching the Fuser Unit 5 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB 6 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB. 7 Replacing the fuser IH unit The fuser IH unit is faulty. Replace the fuser IH unit. 8 Reattaching the edge fan motor The edge fan motor is not properly attached. Reattach the edge fan motor. Fan Motors Attachable Direction

• Code: C6330
• Description: Middle thermistor broken The middle thermistor detects less than 41°C / 105.8°F for 1s continuously when the center thermistor or the edge thermistor detects 100°C / 212°F or more during the warm-up.
• Remedy: 1 Reinstalling the fuser unit The foreign objects adhere on the drawer connection terminal of the fuser unit. Or, the drawer connector is not inserted completely. Clean the drawer connection terminal of the fuser unit. Check the pin of the drawer connector is not bent, and replace the fuser unit if it is bent. If the pin is normal, reinstall the fuser unit so that the drawer connector is securely connected. Detaching and reattaching the Fuser Unit 2 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 3 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . Drawer connector of the fuser unit - Feed image PWB . Feed image PWB - Engine PWB Section 8 "PWBs" 4 Replacing the fuser unit The temperature cannot be detected properly due to the heater broken or the thermistor error. Replace the fuser unit. Detaching and reattaching the Fuser Unit 5 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB 6 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB. 7 Replacing the fuser IH unit The fuser IH unit is faulty. Replace the fuser IH unit.

• Code: C6410
• Description: Uninstalled fuser unit The unit identification code is mismatched. The unit for other models is installed.
• Remedy: 1 Replacing the fuser unit The fuser unit for other models is installed. Install the fuser unit for the applicable models. Detaching and reattaching the Fuser Unit 2 Reinstalling the fuser unit The foreign objects adhere on the drawer connection terminal of the fuser unit. Or, the drawer connector is not inserted completely. Clean the drawer connection terminal of the fuser unit. Check the pin of the drawer connector is not bent, and replace the fuser unit if it is bent. If the pin is normal, reinstall the fuser unit so that the drawer connector is securely connected. Detaching and reattaching the Fuser Unit 3 Firmware upgrade The firmware is faulty. Reinstall the engine firmware. Firmware Update 4 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . Drawer connector of the fuser unit - Feed image PWB . Feed image PWB - Engine PWB Section 8 "PWBs" 5 Replacing the fuser unit The fuser unit is faulty. Replace the fuser unit. Detaching and reattaching the Fuser Unit 6 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB 7 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB.

• Code: C6600
• Description: Fuser belt rotation error The belt rotation pulse is not input for 1.8s continuously.
• Remedy: 1 Reinstalling the fuser unit The foreign objects adhere on the drawer connection terminal of the fuser unit. Or, the drawer connector is not inserted completely. Clean the drawer connection terminal of the fuser unit. Check the pin of the drawer connector is not bent, and replace the fuser unit if it is bent. If the pin is normal, reinstall the fuser unit so that the drawer connector is securely connected. Detaching and reattaching the Fuser Unit 2 Replacing the fuser unit The fuser unit parts such as the fuser belt, the belt rotation detecting system, or the belt rotation sensor are faulty Replace the fuser unit. Detaching and reattaching the Fuser Unit 3 Applying the grease The load increases due to the lack of grease on the bushing or the gears for the fuser motor. Execute U030 [Fuser] to check the fuser motor operation. If the fuser motor does not rotate smoothly, apply the grease (EM- 50LP, Part no.: 7BG010009H) to the bushings or the gears. Maintenanc e Mode List 4 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . Fuser motor - Feed drive PWB . Feed drive PWB - Engine PWB . Feed image PWB - Engine PWB Section 8 "PWBs" 5 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 6 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB 7 Replacing the feed drive PWB The feed drive PWB is faulty. Replace the feed drive PWB. 8 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB. 9 Replacing the fuser drive gear The fuser drive gear is faulty. Replace the fuser drive gear.

• Code: C6610
• Description: Fuser pressure release sensor error 1. The fuser pressure release sensor does not turn off even after 3s passed from instructing to reduce the fuser pressure of the fuser pressure release motor or to move the JAM processing position. 2. The fuser pressure release sensor does not turn on even after 6s passed from instructing to add the fuser pressure of the fuser pressure release motor. 3. The lock signal of the fuser pressure release motor became Low for 200ms. (However, when shifting to JAM process, stop the fuser pressure release motor only and not service call turns on in the area from the stop position 500ms before to the stop position.)
• Remedy: 1 Reinstalling the fuser unit The foreign objects adhere on the drawer connection terminal of the fuser unit. Or, the drawer connector is not inserted completely. Clean the drawer connection terminal of the fuser unit. Check the pin of the drawer connector is not bent, and replace the fuser unit if it is bent. If the pin is normal, reinstall the fuser unit so that the drawer connector is securely connected. Detaching and reattaching the Fuser Unit 2 Checking the connection The connector is not connected properly, or the wire is faulty. Execute U030 [Fuser Release]. If the fuser pressure release motor does not operate properly, reconnect the connectors of the following wires. If there is not continuity, replace the wire. . Fuser pressure release motor - Feed drive PWB . Feed drive PWB - Engine PWB . Drawer connector of the fuser unit - Feed image PWB . Feed image PWB - Engine PWB . Feed image PWB - Feed drive PWB Maintenanc e Mode List Section 8 "PWBs" 3 Replacing the fuser unit The fuser unit is faulty at the fuser pressure release mechanism or the fuser pressure release sensor . Replace the fuser unit. Detaching and reattaching the Fuser Unit 4 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 5 Replacing the feed drive PWB The feed drive PWB is faulty. Replace the feed drive PWB. 6 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB 7 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB. 8 Replacing the fuser pressure release motor The fuser pressure release motor is faulty. Replace the fuser pressure release motor. 9 Replacing the gear in the fuser pressure releasing system at the main unit The gear of the fuser pressure releasing mechanism at the main unit is faulty. Replace the gears in the fuser pressure releasing mechanism at the main unit.

• Code: C6620
• Description: IH core motor rotation error 1. When detecting the home position, IH position sensor does not detect ON within 5s after IH core motor is driven under the condition of the IH position sensor is OFF. 2. When detecting the home position, IH position sensor does not detect ON after it is turned off within 5s after IH core motor is driven under the condition of the IH position sensor is ON. 3. When small size paper moves the position, IH position sensor does not detect OFF within a predetermined pulse after IH core motor is driven under the condition of the IH position sensor is ON.
• Remedy: 1 Checking the fuser IH unit The connector of the fuser IH unit is not properly connected. Check if the connector pins of the fuser IH unit do not bend. If the pins bend, fix them. Next, reinstall the fuser IH unit so that the connector firmly connects. 2 Checking the IH positioning sensor The IH positioning sensor is not properly attached. Reattach the IH positioning sensor. 3 Cleaning the IH positioning sensor The IH positioning sensor cannot detect properly since it is dirty. Clean the IH positioning sensor. 4 Checking the connection The connector is not connected properly, or the wire is faulty. Clean the terminal of the following wire connectors and reconnect the connectors. If there is no continuity, replace the wire. . IH core motor (Fuser IH unit) - Feed drive unit . Feed drive PWB - Engine PWB Section 8 "PWBs" 5 Replacing the fuser IH unit The IH positioning sensor or the IH core motor is faulty. Replace the fuser IH unit. 6 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Update 7 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB. 8 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Detaching and reattaching the Engine PWB