• Code: C7302
• Description: Toner motor C error Object: Color models
• Causes: The toner supply motor drive stopped and waited for 0.1s when the pulse plate of the toner supply screw could not detect the pulse for 2s during the toner supply motor operation. Even if these operations repeated 3 times continuously, the pulse could not be detected.
• Remedy: 1 Checking the toner supply drive unit The toner supply screw is not rotated properly due to the excessive load. (The pulse plate is not rotated.) Check if the toner is not clogged inside the toner supply drive unit by rotating the toner supply screw manually. Then, clean the unit if necessary. 2 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire if there is no continuity.• Toner motor C - Feed image PWB Electrical Diagram of PWBs 3 Replacing the toner supply drive unit The toner supply drive unit (toner motor C or toner remaining amount sensor C) is faulty. Replace the toner supply drive unit. Toner Supply Drive Unit Replacement 4 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 5 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB.

• Code: C7303
• Description: Toner motor M error Object: Color models
• Causes: The toner supply motor drive stopped and waited for 0.1s when the pulse plate of the toner supply screw could not detect the pulse for 2s during the toner supply motor operation. Even if these operations repeated 3 times continuously, the pulse could not be detected.
• Remedy: 1 Checking the toner supply drive unit The toner supply screw is not rotated properly due to the excessive load. (The pulse plate is not rotated.) Check if the toner is not clogged inside the toner supply drive unit by rotating the toner supply screw manually. Then, clean the unit if necessary. 2 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Toner motor M - Feed image PWB Electrical Diagram of PWBs 3 Replacing the toner supply drive unit The toner supply drive unit (toner motor M or toner level sensor M) is faulty. Replace the toner supply drive unit. Toner Supply Drive Unit Replacement 4 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 5 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB

• Code: C7304
• Description: Toner motor Y error Object: Color models
• Causes: The toner supply motor drive stopped and waited for 0.1s when the pulse plate of the toner supply screw could not detect the pulse for 2s during the toner supply motor operation. Even if these operations repeated 3 times continuously, the pulse could not be detected.
• Remedy: 1 Checking the toner supply drive unit The toner supply screw is not rotated properly due to the excessive load. (The pulse plate is not rotated.) Check if the toner is not clogged inside the toner supply drive unit by rotating the toner supply screw manually. Then, clean the unit if necessary. 2 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire if there is no continuity.• Toner motor Y - Feed image PWB Electrical Diagram of PWBs 3 Replacing the toner supply drive unit The toner supply drive unit (toner motor Y or toner level sensor Y) is faulty. Replace the toner supply drive unit. Toner Supply Drive Unit Replacement 4 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 5 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB.

• Code: C7320
• Description: Toner container detection connector error
• Causes: Disconnection of the toner container detection connector was detected when closing the toner container cover.
• Remedy: 1 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Container drive unit - Feed image PWB Electrical Diagram of PWBs 2 Checking the container drive unit The wire is not properly connected or is faulty. Reconnect the connectors in the container drive unit if they are disconnected. Then, replace the container drive unit when the issue is not resolved. Container Drive Unit Replacement 3 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 4 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB

• Code: C7420
• Description: Uninstalled primary transfer unit
• Causes: 1. Unit identification code mismatches.2. The unit for other models is installed.
• Remedy: 1 Primary transfer unit replacement The primary transfer unit for other models is installed. Install the primary transfer unit for the applicable models. Primary Transfer Unit Replacement 2 Reinstalling the primary transfer unit The connector of the primary transfer unit is not firmly connected. Reinstall the primary transfer unit so that the connector firmly connects. Primary Transfer Unit Replacement 3 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Transfer connection PWB - Feed image PWB Electrical Diagram of PWBs 4 Firmware upgrade The firmware is faulty. Reinstall the engine firmware. Firmware Upgrade 5 Replacing the transfer connection PWB The transfer connection PWB is faulty. Replace the transfer connection PWB. 6 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB

• Code: C7470
• Description: Toner sucking fan motor error Object: 35ppm or faster color models and the monochrome models
• Causes: The lock-up was detected for 20s continuously when driving the fan motor.
• Remedy: 1 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Toner absorption fan motor - Feed image PWB Electrical Diagram of PWBs 2 Checking the toner sucking fan motor The fan motor does not rotate properly since it is dirty. Clean the toner sucking fan motor and check if the fan is rotated manually. Then, reattach it. Fan Motors Attachable Direction 3 Replacing the toner sucking fan motor The toner sucking fan motor is faulty. Execute U037 [Toner] to check the operation. If the toner absorption fan motor does not properly operate, replace it. Fan Motors Attachable Direction 4 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 5 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB.

• Code: C7480
• Description: Power source fan motor error
• Causes: The lock-up was detected for 20s continuously when driving the fan motor.
• Remedy: 1 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Power source fan motor - Engine PWB Electrical Diagram of PWBs 2 Checking the power source fan motor The fan motor does not rotate properly since it is dirty. Clean the power source fan motor and check if the fan is rotated manually. Then, reattach it. Fan Motors Attachable Direction 3 Replacing the power source fan motor The power source fan motor is faulty. Replace the power source fan motor if it does not operate properly when executing U037 [LVU]. Fan Motors Attachable Direction 4 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 5 Replacing the engine PWB The engine PWB is faulty. Replace the engine PWB. Engine PWB Replacemen

• Code: C7490
• Description: Eject fan motor error
• Causes: The lock-up was detected for 20s continuously when driving the fan motor.
• Remedy: 1 Checking the wire The wire is not properly connected or is faulty. Reinsert the following wire connectors, and replace the wire when it has no continuity.• Eject fan motor (Fuser drive unit) - Feed image PWB Electrical Diagram of PWBs 2 Checking the eject fan motor The fan motor does not rotate properly since it is dirty. Clean the eject fan motor and check if the fan is rotated manually. Then, reattach it. Fan Motors Attachable Direction 3 Replacing the eject fan motor The eject fan motor is faulty. If the eject fan motor does not operate properly when executing U037 [Exit Cooling], replace it. Fan Motors Attachable Direction 4 Firmware upgrade The firmware is not the latest version. Upgrade the engine firmware to the latest version Firmware Upgrade 5 Replacing the feed image PWB The feed image PWB is faulty. Replace the feed image PWB.