• Code: SC370
• Description: Abnormal TD sensor information (K) - Timing - When communicating with TD sensors, during printing process, or process control self-check - Condition - TD sensor output exceeds 4.5V or drops below 0.5V.
• Causes: • Poor connection • Dirty sensor surface • Defective TD sensor • Toner density is out of range • Not enough developer
• Remedy: 1. Make sure the TD sensor is properly connected. 2. Check if the connectors on the TD sensor interface board 1 and the slip ring and the TD sensor interface board 2 are properly connected. 3. Clean the surface of the TD sensor. 4. Replace the TD sensor. If it becomes OK after the sensor is replaced, replace the developer of color related to the problem. If the problem is related to the toner density (too low or high), find the cause and fix it.

• Code: SC371
• Description: Abnormal TD sensor information (Y) - Timing - When communicating with TD sensors, during printing process, or process control self-check - Condition - TD sensor output exceeds 4.5V or drops below 0.5V.
• Causes: • Poor connection • Dirty sensor surface • Defective TD sensor • Toner density is out of range • Not enough developer
• Remedy: 1. Make sure the TD sensor is properly connected. 2. Check if the connectors on the TD sensor interface board 1 and the slip ring and the TD sensor interface board 2 are properly connected. 3. Clean the surface of the TD sensor. 4. Replace the TD sensor. If it becomes OK after the sensor is replaced, replace the developer of color related to the problem. If the problem is related to the toner density (too low or high), find the cause and fix it.

• Code: SC372
• Description: Abnormal TD sensor information (C) - Timing - When communicating with TD sensors, during printing process, or process control self-check - Condition - TD sensor output exceeds 4.5V or drops below 0.5V.
• Causes: • Poor connection • Dirty sensor surface • Defective TD sensor • Toner density is out of range • Not enough developer
• Remedy: 1. Make sure the TD sensor is properly connected. 2. Check if the connectors on the TD sensor interface board 1 and the slip ring and the TD sensor interface board 2 are properly connected. 3. Clean the surface of the TD sensor. 4. Replace the TD sensor. If it becomes OK after the sensor is replaced, replace the developer of color related to the problem. If the problem is related to the toner density (too low or high), find the cause and fix it.

• Code: SC373
• Description: Abnormal TD sensor information (M) - Timing - When communicating with TD sensors, during printing process, or process control self-check - Condition - TD sensor output exceeds 4.5V or drops below 0.5V.
• Causes: • Poor connection • Dirty sensor surface • Defective TD sensor • Toner density is out of range • Not enough developer
• Remedy: 1. Make sure the TD sensor is properly connected. 2. Check if the connectors on the TD sensor interface board 1 and the slip ring and the TD sensor interface board 2 are properly connected. 3. Clean the surface of the TD sensor. 4. Replace the TD sensor. If it becomes OK after the sensor is replaced, replace the developer of color related to the problem. If the problem is related to the toner density (too low or high), find the cause and fix it.

• Code: SC385
• Description: ID sensor VSG adjustment error - Timing - During process control self check, the main control board detects an out-ofrange VSG signal from the ID sensor.
• Causes: • Dirty ID sensor • Poor connection • Defective ID sensor • Poor cleaning of the OPC drum
• Remedy: 1. Clean the ID sensor. 2. Make sure the sensor is properly connected. 3. Replace the ID sensor. 4. Check the drum cleaning unit. [Signal Check] • ID sensor LED: CN216-B7 or TP103 on I/O control board • ID sensor 1 (K ): CN216-B8 or TP188 on I/O control board / TP115 on main control board. • ID sensor 2 (CMY): CN216-B9 or TP187 on the I/O control board / TP114 on the main control board.

• Code: SC387
• Description: Drum potential error - Timing - During initial process control check or interval (number of copies) process control check - Condition - While the revolver unit returns to the home position, the following condition is detected. VD < VG – 200V VD > VG + 200V
• Causes: • Uneven charge • Deterioration of the drum • Defective potential sensor
• Remedy: 1. Clean the charge unit or replace the charge wire and grid plate. 2. Reinstall the drum unit. 3. Check the drum counter (SP7-803) and replace the drum if necessary. 4. Replace the potential sensor.

• Code: SC400
• Description: Image transfer belt bias error - Timing - While the image transfer belt bias is ON - Condition - The feedback voltage is 4.8V or higher, or PWM value is 50% or higher for 500ms continuously.
• Causes: • Poor connections • Defective high voltage supply board (T1/PCC/BR) • Defective I/O control board • Defective main control board
• Remedy: 1. Make sure the high voltage cable and trigger lines are properly connected to the high voltage supply board, I/O control board, and main control board. 2. Replace the high voltage supply board (T1/PCC/BR). 3. Replace the I/O control board. 4. Replace the main control board. [Signal Check] • Feedback signal: CN209-9, TP264, or CN211-A4 on I/O control board / CN302- A6 or TP106 on main control board. • PWM: CN209-10 or TP272 on the I/O control board.

• Code: SC401
• Description: Locked image transfer belt motor - Timing & Condition - • The feedback signal from the motor is still out of range 2 seconds after the trigger signal was sent. • The feedback signal goes out of range for 2 seconds while the trigger signal is ON.
• Causes: • Defective image transfer belt motor • Defective image transfer belt motor drive board • Mechanical problem (drive transmission)
• Remedy: 1. Make sure the connectors on the image transfer belt drive board (CN740 and 741) and I/O control board (CN220) are properly connected. 2. Check if the harnesses are damaged. 3. Replace the image transfer belt motor control board. 4. Replace image transfer belt motor. 5. See if anything has caused the belt motor’s load to increase. [Signal Check] • Motor OK: CN220-A2 or TP153 on the I/O control board