• Code: SC456
• Description: Paper transfer unit position error - Timing & Condition • The paper transfer home position sensor does not detect the paper transfer unit moving into the contact position or the release position at the correct time.
• Causes: • Defective paper transfer positioning clutch • Defective I/O control board
• Remedy: 1. Replace the paper transfer H.P. sensor. (Input Check: SP 5-803-11) 2. Replace the paper transfer positioning clutch. (Output Check: SP 5-804-23) 3. Replace the I/O control board. - Signals to Check - • H.P.: CN229-5 or TP286 on I/O control board

• Code: SC457
• Description: Image transfer belt cleaning unit position error - Timing & Condition • The belt cleaning home position sensor does not detect the transfer belt cleaning unit moving into the contact position or the release position at the correct time.
• Causes: • Dirty sensor • Defective sensor • Defective belt cleaning clutch • Defective I/O control board • Defective main control board
• Remedy: 1. Pull out and re-insert the image transfer belt unit. 2. Clean the belt cleaning H.P. sensor if it is dirty. 3. Replace the sensor. (Input Check: 5-803-12) 4. Replace the belt cleaning clutch. (Output Check: SP 5- 804-36) 5. Replace the I/O control board. 6. Replace the main control board. - Signals to Check - • H.P.: CN202-2 or TP254 on I/O control board

• Code: SC495
• Description: Temperature sensor error - Timing & Condition - The temperature sensor output is out of range (2.75V or greater 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 that the connectors (CN236, 214 & 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. - Signals to Check - • Temperature: CN236-6, TP247, or CN214-A9 on I/O control board / CN302-A1 or TP223 on main control board

• Code: SC496
• Description: Humidity sensor error - Timing & Condition - The humidity sensor output is out of range (2.75V or greater 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 connector is properly connected on the I/O board (CN236). 2. Replace the humidity sensor. 3. Replace the I/O control board. 4. Replace the main control board. - Signals to Check - • Humidity: CN236-3, TP222, or CN214-A8 on I/O control board / CN302-A2 or TP168 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 (CN204) is properly connected on the I/O control board. 2. Replace the fusing motor. (Output check: SP 5-804- 05,-06,-07,-08) 3. Replace the I/O control board. 4. Replace the main control board. 5. Check if anything causes overload for the fusing unit drive. - Signals to Check - • Motor OK: CN204-7 on I/O control board

• Code: SC501
• Description: 1st paper tray error - Timing & Condition - • The upper limit sensor does not turn on1.5 s after the tray bottom plate starts to go up.
• Causes: • Defective upper limit sensor • Defective tray bottom plate • 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 cable is properly connected. 3. Clean or replace the sensor and replace it if necessary (Input Check: SP 5-803-14 to 17). 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. - Signals to Check - • Limit sensor H.P.: CN226-2 or TP206 on I/O control board

• Code: SC502
• Description: 2nd paper tray error - Timing & Condition - • The upper limit sensor does not turn on1.5 s after the tray bottom plate starts to go up.
• Causes: • Defective upper limit sensor • Defective tray bottom plate • 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 cable is properly connected. 3. Clean or replace the sensor and replace it if necessary (Input Check: SP 5-803-14 to 17). 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. - Signals to Check - • Limit sensor H.P.: CN226-2 or TP206 on I/O control board

• Code: SC503
• Description: 3rd paper tray error - Timing & Condition - • The upper limit sensor does not turn on1.5 s after the tray bottom plate starts to go up.
• Causes: • Defective upper limit sensor • Defective tray bottom plate • 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 cable is properly connected. 3. Clean or replace the sensor and replace it if necessary (Input Check: SP 5-803-14 to 17). 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. - Signals to Check - • Limit sensor H.P.: CN226-2 or TP206 on I/O control board