• Code: SC402
• Description: Current leak from the image transfer belt lubricant brush - Timing & Condition - A 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. Make sure the terminal and high voltage supply board (Q1) are properly connected and that the harnesses are not damaged. 2. Clean the contacts. 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 the I/O control board

• Code: SC410
• Description: Paper separation current leak - Timing & Condition - When a current leak is detected for 2 seconds and the leak detection started 1 second after the paper separation corona turned on. This leak signal is monitored twice a second. If it is detected twice in a row, this SC is displayed.
• Causes: • Discharge unit not properly installed • Broken corona wire • Defective high voltage supply board (D) • Defective I/O control board • Defective main control board
• Remedy: 1. Make sure the discharge corona unit is properly installed. 2. If the discharge corona wire is broken, replace it. 3. Make sure the terminal and high voltage supply board (D) are properly connected and that the harnesses are not damaged. 4. Clean the contacts. 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 the I/O control board

• Code: SC422
• Description: - Timing & Condition - When the current leak is detected for 2 seconds, and the leak detection started 1 second after the PCC turned on. This leak signal is monitored twice a second. If it is detected twice in a row, this SC is displayed.
• Causes: • PCC unit not properly installed • Broken corona wire • Defective high voltage supply board (T1/PCC/BR) • Defective I/O control board • Defective main control board
• Remedy: 1. Make sure the PCC unit is properly installed. 2. If the discharge corona wire is broken, replace it. 3. Make sure the terminal and high voltage supply board (T1/PCC/BR) are properly connected and that the harnesses are not damaged. 4. Clean the contacts. 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 the 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 was sent. • The feedback signal goes out of range for 2 seconds while the trigger signal is ON.
• Causes: • Poor connection • Defective drum motor • Defective I/O control board • Defective main control board
• Remedy: 1. See if the drum is locked in place by the cleaning blade. If it is, replace the cleaning blade. 2. Make sure that connector CN215 on the I/O control board is properly connected. 3. See if the drum motor works properly in SP5-804-001 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: Locked drum peripheral component motor - Timing & Condition - • The feedback signal from the motor is still out of range 1 second after the trigger signal was sent. • The feedback signal goes 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. Make sure that connector CN220 on the I/O control board is properly connected. 2. Check for 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 the 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 the PWM value is 50% or higher for 500ms continuously.
• Causes: • Defective high voltage supply board (T2) • Defective I/O control board • Defective main control board • If the paper transfer belt does not touch the image transfer belt and the paper transfer belt bias is ON
• Remedy: 1. Make sure the paper transfer belt unit rises to touch the image transfer belt during the copy cycle. 2. Make sure the high voltage cable and trigger lines are properly connected to 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 the 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.
• Causes: • Dirty or damaged belt mark • Belt mark out of position • Defective sensor • Defective I/O control board • Defective main control board
• Remedy: 1. Make sure the image transfer release lever is properly set. 2. Clean the belt mark. 3. Replace the transfer belt if the belt mark peels off or is damaged. 4. Clean the belt mark sensor. 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 the I/O control board / CN303-B1 or TP108 on the main control board.

• Code: SC457
• Description: Position error for the image transfer belt’s cleaning unit - Timing & Condition • When the belt cleaning section touches the image transfer belt, but the belt cleaning sensor signal remains LOW. • When the belt cleaning section releases from the image transfer belt, but the belt cleaning sensor remains HIGH.
• Causes: • Dirty Sensor • Defective sensor • Defective belt cleaning shift clutch • Defective drum peripheral component motor • Defective I/O control board • Defective main control board
• Remedy: 1. Pull out and re-insert the image transfer belt unit. 2. Clean the image transfer belt cleaning H.P. sensor. 3. Replace the sensor. (Input Check: 5-803- 012) 4. Replace the belt cleaning shift clutch. (Output Check: SP5-804-036) 5. Replace the drum peripheral component motor. 6. Replace the I/O control board. 7. Replace the main control board. [Signal Check] • H.P.: CN219-B2 or TP108 on the I/O control board