• Code: SC402
• Description: Image transfer belt lubricant brush current leak - Timing & Condition - The current leak is detected more than 2 seconds.
• Causes: • Defective high voltage supply board (Q1). • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the connectors on the terminal and high voltage supply board (Q1) are properly connected and if the harnesses are damaged. 2. Clean the receptacles. 3. Replace the high voltage supply board (Q1). 4. Replace the I/O control board. 5. Replace the main control board. [ Signal Check ] • Leak detection: CN215-B7 or TP137 on I/O control board

• Code: SC410
• Description: Paper separation current leak - Timing & Condition - When the current leak is detected for 2 seconds, leak detection starts 1 second after the paper separation corona turns on. The leak signal is monitored twice at every 1 second. When the leak condition is detected twice continuously, this SC is displayed.
• Causes: • Discharge unit not properly set • Corona wire broken • Defective high voltage supply board (D) • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the discharge corona unit is properly set. 2. Replace the discharge corona wire if it is broken. 3. Check if the connectors on the terminal and high voltage supply board (D) are properly connected and if the harnesses are damaged. 4. Clean the receptacle. 5. Replace the high voltage supply board (D). 6. Replace the I/O control board. 7. Replace the main control board. [ Signal Check ] • Leak detection: CN208-1 or TP276 on I/O control board

• Code: SC422
• Description: PCC leak - Timing & Condition - When the current leak is detected for 2 seconds, leak detection starts 1 second after the PCC turns on. The leak signal is monitored twice at every 1 second. When the leak condition is detected twice continuously, this SC is displayed.
• Causes: • PCC unit not properly set • Corona wire broken • Defective high voltage supply board (T1/PCC/BR) • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the PCC unit is properly set. 2. Replace the discharge wire if it is broken. 3. Check if the connectors on the terminal and high voltage supply board (T1/PCC/BR) are properly connected and if the harnesses are damaged. 4. Clean the receptacle. 5. Replace the high voltage supply board (T1/PCC/BR). 6. Replace the I/O control board. 7. Replace the main control board. [ Signal Check ] • Leak detection: CN209-6 or TP275 on I/O control board

• Code: SC440
• Description: Drum motor error - Timing & Condition - • The feedback signal from the motor is still out of range 1 second after the trigger signal is sent. • The feedback signal becomes out of range for 2 seconds while the trigger signal is ON.
• Causes: • Poor connection of connector • Defective drum motor • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the drum is locked by the cleaning blade. If yes, replace the cleaning blade. 2. Check if the connector (CN215) on the I/O control board is properly connected. 3. Check if the drum motor works properly in SP 5-804- 001 to 003. If not, replace the drum motor. 4. Replace the I/O control board. 5. Replace the main control board. [ Signal Check ] • Motor OK: CN215-A7 or TP135 on the I/O control board

• Code: SC441
• Description: Drum peripheral component motor lock - Timing & Condition - • The feedback signal from the motor is still out of range 1 second after the trigger signal is sent. • The feedback signal becomes out of range for 2 seconds while the trigger signal is ON.
• Causes: • Defective motor • Defective motor dive board • Mechanical problem (drive transmission problem)
• Remedy: 1. Check if the connector (CN220) on I/O control board is properly connected. 2. Check if there is any mechanical problem by rotating the motor manually. 3. Replace the drum peripheral component motor. 4. Replace the I/O control board. 5. Replace the main control board. [ Signal Check ] • Motor OK: CN220-B9 or TP123 on I/O control board

• Code: SC450
• Description: Paper transfer bias current error - Timing - When the paper transfer bias turns on during printing process - Condition - The feedback voltage is 4.8V or higher, or PWM value is 50% or higher for 500ms continuously.
• Causes: • Defective high voltage supply (T2) • Defective I/O control board • Defective main control board • When the paper transfer belt does not touch with the image transfer belt and the paper transfer belt bias is ON
• Remedy: 1. Check if the paper transfer belt unit moves up and touch with the image transfer belt during copy cycle properly. 2. Check if the connectors of high voltage cable and trigger lines are properly connected on the high voltage supply board (T2), I/O control board, and main control board. 3. Replace the high voltage supply board (T2). 4. Replace the I/O control board. 5. Replace the main control board. [ Signal Check ] • Feedback signal: CN221-A1, TP172, or CN211-A3 on I/O control board / CN302-A7 or TP105 on the main control board • PWM: CN221-A2 or TP138 on I/O control board

• Code: SC451
• Description: Paper transfer belt motor lock - Timing & Condition - • The feedback signal from the motor is still out of range 1 second after the trigger signal is sent. • The feedback signal becomes out of range for 2 seconds while the trigger signal is ON.
• Causes: • Defective motor • Defective motor dive board • Mechanical problem (drive transmission problem)
• Remedy: 1. Check if the connectors on the paper transfer belt drive board and I/O control board (CN221) are properly connected. 2. Check if there is any mechanical problem by rotating the motor manually. 3. Replace the paper transfer belt motor. 4. Replace the paper transfer belt motor drive board. 5. Replace the I/O control board. 6. Replace the main control board. [ Signal Check ] • Feedback signal: CN221-B7 or TP154 on I/O control board

• Code: SC452
• Description: Belt mark detection error - Timing & Condition- The main control board does not receive the belt mark detection signal from the belt mark detection sensor for a certain period
• Causes: • Dirty or damaged belt mark • Belt mark out of position • Defective sensor • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the image transfer release lever is properly set. 2. Clean the belt mark if it is dirty. 3. Replace the transfer belt if the belt mark peels off or damaged. 4. Clean the belt mark sensor if it is dirty. 5. Replace the belt mark detection sensor. 6. Replace the I/O control board. 7. Replace the main control board. [ Signal Check ] • Belt mark: CN220-A12, TP106, or CN212-B11 on I/O control board / CN303-B1 or TP108 on the main control board.