• Code: SC541-02
• Description: Central NC Sensor Disconnection 3ED - 3FF (FB voltage: 3.243V-3.300V) is detected for specified seconds continuously (NC sensor center: detection & compensation NC sensor edge: detection & compensation). Detection period: 100 ms, detection frequency: 10 times or more.
• Causes: • NC sensor disconnection • Connector disconnected
• Remedy: • Reset the NC sensor. • Reset the connector. • Replace the connector.

• Code: SC541-03
• Description: Central NC Sensor Short-circuit AD value: 0-13 (FB voltage: 0.000V-0.041V) is detected for specified seconds continuously. Detection period: 100 ms, detection frequency: 10 times or more.
• Causes: • NC short-circuit • Connector disconnected
• Remedy: • Reset the NC sensor. • Reset the connector. • Replace the connector.

• Code: SC542-02
• Description: Fusing Central Thermopile Does Not Reload When the fusing central thermopile does not reach a predetermined temperature for 7 seconds consecutively.
• Causes: • Thermopile lens dirt • Thermopile modification/float • Outside input voltage guarantee • After excessive temperature rise prevention unit operation
• Remedy: • Replace the thermopile. • Check that the input voltage is within acceptable limits.

• Code: SC542-03
• Description: Fusing Central Thermopile Does Not Reload When the fusing central thermopile does not reach the permission temperature of heat central reloading for specified seconds continuously.
• Causes: • Thermopile lens dirt • Thermopile modification/float • Outside input voltage guarantee • After excessive temperature rise prevention unit operation
• Remedy: • Replace the thermopile. • Check that the input voltage is within acceptable limits.

• Code: SC542-05
• Description: Fusing Central Thermopile Does Not Reload (Low Voltage) When the fusing central thermopile does not reach a predetermined temperature for 7 seconds consecutively.
• Causes: • Thermopile lens dirt • Thermopile modification/float • Outside input voltage guarantee • After excessive temperature rise prevention unit operation
• Remedy: • Replace the thermopile. • Check that the input voltage is within acceptable limits.

• Code: SC542-06
• Description: Fusing Central Thermopile Does Not Reload (Low Voltage) When the fusing central thermopile does not reach the permission temperature of heat central reloading for specified seconds continuously.
• Causes: • Thermopile lens dirt • Thermopile modification/float • Outside input voltage guarantee • After excessive temperature rise prevention unit operation
• Remedy: • Replace the thermopile. • Check that the input voltage is within acceptable limits.

• Code: SC543-00
• Description: Fusing Central Thermopile High Temperature Detection (Software) When the fusing central thermopile detects a predetermined temperature or above for specified seconds consecutively. Detection period 100ms, detection count: 10 times or more.
• Causes: • Triac short-circuit • IOB board defective • BCU board defective
• Remedy: • Replace the IOB board. • Replace the BCU board. • Replace the fusing unit. SC Tables: SC5xx (Paper Feed and Fusing)

• Code: SC544-01
• Description: Fusing High Temperature Detection (hardware) (Central Thermopile High Temperature Error) In the event of an error
• Causes: • Triac defective (short-circuit) • Engine controller defective • Heating central thermopile defective • Fusing control software: out of control
• Remedy: • If the triac is defective, replace the AC power supply board. • If necessary, replace the BCU or the heating central thermopile.