• Code: SC455
• Description: Paper transfer belt discharge corona current leak - Timing & Condition - When the current leak is detected for 2 seconds, leak detection starts 1 second after the discharge 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 (Q2) • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the discharge corona unit is properly set. 2. Replace the discharge if it is broken. 3. Check if the connectors on the terminal and high voltage supply board (Q2) are properly connected and if the harnesses are damaged. 4. Clean the receptacle. 5. Replace the high voltage supply board (Q2). 6. Replace the I/O control board. 7. Replace the main control board. [ Signal Check ] • Leak detection: CN221-A5 or TP149 on I/O control board

• Code: SC456
• Description: Paper transfer unit position error - Timing & Condition • When the paper transfer belt touches the image transfer belt, the paper transfer belt unit H.P. sensor signal stays HIGH. • When the paper transfer belt releases from the image transfer belt. The paper transfer belt unit H.P sensor stays LOW.
• Causes: • Broken joint parts • Defective paper transfer belt shift clutch • Defective drum peripheral component motor • Defective I/O control board
• Remedy: 1. Pull out and re-insert the paper transport unit. 2. Check if the joint parts are broken or not. 3. Replace the paper transfer belt unit H.P. sensor. (Input Check: SP 5-803-011) 4. Replace the paper transfer belt shift clutch. (Output Check: SP 5-804-023) 5. Replace the drum peripheral component motor. 6. Replace the I/O control board. [ Signal Check ] • H.P.: CNCN221-B2or TP148 on I/O control Board

• Code: SC457
• Description: Image transfer belt cleaning unit position error - Timing & Condition • When the belt cleaning section touches the image transfer belt, the belt cleaning sensor signal stays LOW. • When the belt cleaning section releases from the image transfer belt. The belt cleaning sensor stays 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 if it is dirty. 3. Replace the sensor. (Input Check: 5-803-012) 4. Replace the belt cleaning shift clutch. (Output Check: SP 5-804-036) 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 I/O control board

• Code: SC495
• Description: Humidity sensor - temperature detection error - Timing & Condition - The humidity sensor output for temperature is higher than 2.75V or less than 0.25V.
• Causes: • Poor connection of connector • Defective humidity sensor • Defective I/O control board • Defective main control board
• Remedy: 1. Check the connectors (CN210, 211 & CN302) are properly connected on the I/O control board and main control board. 2. Replace the humidity sensor. 3. Replace the I/O control board. 4. Replace the main control board. [ Signal Check ] • Temperature: CN210-1, TP247, or CN211-A9 on I/O control board / CN302-A1 or TP112 on main control board

• Code: SC496
• Description: Humidity sensor - humidity detection error - Timing & Condition - The humidity sensor output for humidity is higher than 2V or less than 0.125V.
• Causes: • Poor connection of connector • Defective humidity sensor • Defective I/O control board • Defective main control board
• Remedy: 1. Check the connectors (CN210, 211 & CN302) are properly connected on the I/O control board and main control board. 2. Replace the humidity sensor. 3. Replace the I/O control board. 4. Replace the main control board. [ Signal Check ] • Humidity: CN201-4, TP236, or CN211-A8 on I/O control board / CN302-A2 or TP113 on main control board

• Code: SC500
• Description: Fusing 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 fusing motor • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the connector (CN218) is properly connected on the I/O control board. 2. Replace the fusing motor. (Output check: SP 5-804- 005) 3. Replace the I/O control board. 4. Replace the main control board. 5. Check if anything causes overload for the fusing unit drive. [ Signal Check ] • Motor OK: CN218-7 or TP104 on I/O control board

• Code: SC501
• Description: 1st paper tray error - Timing & Condition - • The upper limit sensor stays HIGH when the pick-up solenoid turns off. • The upper limit sensor stays LOW 1.5 seconds after the tray bottom plate goes down. • The upper limit sensor stays HIGH 10 seconds after the tray bottom plate goes up. • The upper limit sensor stays HIGH 3 seconds after the tray bottom plate goes up again.
• Causes: • Pick-up solenoid spring come off • Defective upper limit sensor • Defective tray bottom plate • Defective tray lift motor • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the spring of pick-up solenoid comes off. 2. Check if the sensor harness is properly connected. 3. Clean or replace the sensor and replace it if necessary (Input Check: SP 5-803-014 to 017). 4. Replace the tray bottom lever if it is broken. 5. Pull out the paper tray and check if the tray lift motor works properly (Output Check: SP 5-804-75 to 82) 6. Replace the I/O control board. 7. Replace the main control board. [ Signal Check ] • Limit sensor H.P.: CN224-A8 or TP215 on I/O control board

• Code: SC503
• Description: 3rd paper tray error - Timing & Condition - • The upper limit sensor stays HIGH when the pick-up solenoid turns off. • The upper limit sensor stays LOW 1.5 seconds after the tray bottom plate goes down. • The upper limit sensor stays HIGH 10 seconds after the tray bottom plate goes up. • The upper limit sensor stays HIGH 3 seconds after the tray bottom plate goes up again.
• Causes: • Pick-up solenoid spring come off • Defective upper limit sensor • Defective tray bottom plate • Defective tray lift motor • Defective I/O control board • Defective main control board
• Remedy: 1. Check if the spring of pick-up solenoid comes off. 2. Check if the sensor harness is properly connected. 3. Clean or replace the sensor and replace it if necessary (Input Check: SP 5-803-014 to 017). 4. Replace the tray bottom lever if it is broken. 5. Pull out the paper tray and check if the tray lift motor works properly (Output Check: SP 5-804-75 to 82) 6. Replace the I/O control board. 7. Replace the main control board. [ Signal Check ] • Limit sensor H.P.: CN224-A8 or TP215 on I/O control board [ Signal Check ] • Limit sensor H.P.: CN226-A8 or TP282 on I/O control board