• Code: SC551-00
• Description: Sensor 4: Pressure Roller Center Disconnection 0 degrees or lower was detected for (t1) seconds consecutively. Number of times: 10 or more D135 (Japan): 75 (seconds) D136 (Japan)/D135 (NA): 75 (seconds) D136 (NA)/D135 (EU)/D136(EU): 75 (seconds) D137 (Japan): 75 (seconds) D138 (Japan)/D137 (NA)/D138 (NA)/D137 (EU)/D138 (EU): 75 (seconds) 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: • Thermopile disconnection • Connecter contact failure
• Remedy: • Replace the thermopile. • Reconnect the connector. • Replace the connector. • Replace the connector.

• Code: SC552-02
• Description: Sensor 4: Heating Roller Center: Reload Failure: Timeout 1 Failed to reach (T2) degrees centigrade after (t4) seconds from the start of heater control. D135 (Japan):T2 = 45, t4 = 80 D136 (Japan)/D135 (NA): T2 = 45, t4 = 60 D136 (NA)/D135 (EU)/D136(EU): T2 = 45, t4 = 60 D137 (Japan): T2 = 45, t4 = 60 D138 (Japan)/D137 (NA)/D138 (NA)/D137 (EU)/D138 (EU): T2 = 45, t4 = 60 Monitored at: Startup (Power-on, when a cover is closed, when fuser heater is under control)
• Causes: • Thermistor deformed or floating • Input voltage out of specification
• Remedy: • Replace the thermopile. • Use with supported input voltage • Replace the pressure roller heater. • Replace the unit.

• Code: SC552-03
• Description: Sensor 4: 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: • Pressure heater malfunctioning • Overheating prevention device worked.
• Remedy: • Replace the thermopile. • Use with supported input voltage • Replace the pressure roller heater. • Replace the unit.

• Code: SC553-00
• Description: Sensor 4: Pressure 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 = 220, t6 = 1 D136 (Japan)/D135 (NA): T3 = 220, t6 = 1 D136 (NA)/D135 (EU)/D136(EU): T3 = 220, t6 = 1 D137 (Japan): T3 = 220, t6 = 1 D138 (Japan)/D137 (NA)/D138 (NA)/D137 (EU)/D138 (EU): T3 = 220, 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: SC554-00
• Description: Pressure Roller Center: Overheat detection (hardware) Hardware detection of overheat condition. The pressure roller center thermopile was detected as the cause.
• Causes: • IOB defective • Fuser control software running out of control • Triac damaged (shorted). • Pressure roller center thermopile defective
• Remedy: • After removing the cause of the SC, Set "Fusing SC Clear" in the SP mode. • If necessary, replace: IOB/pressure roller center thermopile/AC drive.

• Code: SC555-00
• Description: Heater 2: Heater Continuously On (Sensor 4: Thermopile: Pressure Roller Center) Target temperature was not reached (t7) seconds after reload. Time elapsed after reload (excluding paper transport time) (t8) D135 (Japan): t7 = 90, t8 = 90 D136 (Japan)/D135 (NA): t7 = 90, t8 = 90 D136 (NA)/D135 (EU)/D136(EU): t7 = 90, t8 = 90 D137 (Japan): t7 = 90, t8 = 90 D138 (Japan)/D137 (NA)/D138 (NA)/D137 (EU)/D138 (EU): t7 = 90, t8 = 90 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: • Thermopile detection error • Heater disconnection • Overheating prevention device worked.
• Remedy: • Replace the thermopile. • Replace the heater. • Replace the unit.

• Code: SC557-00
• Description: Zero Cross Error (high frequency)
• Causes: • Unstable commercial power supply frequency
• Remedy: No action required.

• Code: SC559-00
• Description: Fusing jam: 3 counts Fusing jam (fusing exit sensor late jam) was detected 3 times consecutively. Details: This SC can be set ON/OFF. The factory setting is OFF; set it ON when requested by the customer. SP1-142-001: 0: OFF (factory setting) 1: ON (set by service personnel at the request of customer) This prevents collateral problems (such as thermistor floating) that may be caused by repeated jams in the fusing unit. • The jam counter is not reset by power off/on. • When paper is output successfully, the jam counter is reset.
• Causes: • Paper jam in the fusing unit • Sensor defective
• Remedy: