• Code: SC542-03
• Description: Sensor 1: Heating Roller Center: Reload Failure: Timeout 2 Failed to reach reload temperature after (t5) seconds from the start of heater control. D135 (Japan):t5 = 230 D136 (Japan)/D135 (NA): t5 = 230 D136 (NA)/D135 (EU)/D136(EU): t5 = 230 D137 (Japan): t5 = 230 D138 (Japan)/D137 (NA)/D138 (NA)/D137 (EU)/D138 (EU): t5 = 230 Monitored at: Startup (Power-on, when a cover is closed, when fuser heater is under control)
• Causes: • IH malfunctioning • Overheating prevention device worked.
• Remedy: • Replace the thermopile. • Use with supported input voltage • Replace the IH coil/IH inverter. • Replace the unit.

• Code: SC543-00
• Description: Sensor 1: Heating Roller Center: Overheat detection (software) (T3) degrees centigrade or higher was detected for (t6) seconds consecutively. Number of times: 10 or more D135 (Japan):T3 = 250, t6 = 1 D136 (Japan)/D135 (NA): T3 = 250, t6 = 1 D136 (NA)/D135 (EU)/D136(EU): T3 = 250, t6 = 1 D137 (Japan): T3 = 250, t6 = 1 D138 (Japan)/D137 (NA)/D138 (NA)/D137 (EU)/D138 (EU): T3 = 250, t6 = 1 Monitored at: All times, though SC is not issued when temperature is not controlled (when in off mode/sleep mode, when a door, excluding the toner supply door, is open, or when the heater relay is off).
• Causes: • Triac shorted. • IOB board defective.
• Remedy: • Replace the IOB board. • Replace the unit.

• Code: SC544-00
• Description: Heating Roller Center: Overheat detection (hardware) Hardware detection of overheat condition. The heating roller center thermopile was detected as the cause.
• Causes: • IOB defective • Fuser control software running out of control • Heating roller center thermopile defective • IH inverter supplied continuously (software error or temperature sensor malfunctioning
• Remedy: • After removing the cause of the SC, set "Fusing SC Clear" in the SP mode. • If necessary, replace: IOB/heating roller center thermopile/IH coil/ IH inverter.

• Code: SC547-01
• Description: Zero Cross Error (Relay contact welded) When this error occurs, machine stops with fusing relay off and displays the SC.
• Causes: • Fusing relay defective (contact welded) • Fusing relay drive circuit defective
• Remedy: • Turn the main power off/on. • If the fusing relay is damaged, replace the AC control board. • Check the connection between the AC control board and the FSB (fusing IOB) and replace the harness and/or circuit board if necessary.

• Code: SC547-02
• Description: Zero Cross Error (Relay contact defective) When this error occurs, the fusing heater trigger turns off and then, after a specified time, machine stops with fusing relay off and displays the SC.
• Causes: • Fusing relay defective (contact welded) • Fusing relay drive circuit defective
• Remedy: • Turn the main power off/on. • If the fusing relay is damaged, replace the AC control board. • Check the connection between the AC control board and the FSB (fusing IOB) and replace the harness and/or circuit board if necessary.

• Code: SC547-03
• Description: Zero Cross Error (low frequency error) When this error occurs, the fusing heater trigger turns off and then, after a specified time, machine stops with fusing relay off and displays the SC.
• Causes: • Unstable commercial power supply frequency
• Remedy: • Turn the main power off/on. • If the fusing relay is damaged, replace the AC control board. • Check the connection between the AC control board and the FSB (fusing IOB) and replace the harness and/or circuit board if necessary.

• Code: SC548-00
• Description: Fusing rotation detection Blocking/non-blocking signal of the heating roller rotation sensor was not received within specified time.
• Causes: • The feeler for heating roller rotation detection deformed or broken. • Fusing motor defective • Heating roller rotation sensor defective • IOB defective
• Remedy: • After removing the cause of the SC, set "Fusing SC Clear" in the SP mode, and then turn the main power off/on.

• Code: SC550-01
• Description: Refresh roller drive motor: Lock The IOB detects the fusing motor lock error (rotation speed out of specification). Vodka assignment: GPIO28DATA[7] Details: When the motor is on, each lock signal is checked every 100 milliseconds. If the High status is detected 20 times consecutively, the machine determines that the motor is not running correctly. The machine issues an SC and stops the motor.
• Causes: • Motor defective • Connecter disconnected • Harness broken • IOB defective • Unit torque increased.
• Remedy: • Replace the motor. • Reconnect the connector. • Replace the harness. • Replace the IOB. • Replace the unit. • Replace the driven unit.