SC500 (Engine: Paper Transport 2: Fusing, Others)

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC540-01	D	Fusing Pressure Release Motor (M9) Error 1
		The over-current detection signal of the fusing pressure release motor (M9) is detected 20 times consecutively.
		Connector disconnected or defective Drive transmission of the Fusing pressure release motor (M9) defective Fusing pressure release motor (M9) defective Connect-Left PCB (PCB20) defective IOB (PCB17) defective
		Connector disconnected or defective Reconnect the following connectors. Then perform a conduction inspection. If there is no conduction, replace the connector. Fusing Pressure Release Motor (M9) – Connect-Left PCB (PCB20) connector Connect-Left PCB (PCB20) – IOB (PCB17) connector
		Drive transmission of the Fusing pressure release motor (M9) defective Check the gears. If any gears are damaged, replace them. Fusing pressure release motor (M9) defective Replace the Fusing pressure release motor (M9). Connect-Left PCB (PCB20) defective Replace the Connect-Left PCB (PCB20). IOB (PCB17) defective Replace the IOB (PCB17).

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC540-02	D	Fusing Pressure Release Motor (M9) Error 2
		The position detection sensor is not detected for 30 seconds consecutively after the fusing pressure release motor (M9) is activated.
		Connector defective or disconnected Drive transmission of the Fusing pressure release motor (M9) defective Fusing pressure release motor (M9) defective Connect-Left PCB (PCB20) defective IOB (PCB17) defective
		Connector defective or disconnected Reconnect the following connectors. Then perform a conduction inspection. If there is no conduction, replace the connector. Fusing Pressure Release Motor (M9) – Connect-Left PCB (PCB20) connector Connect-Left PCB (PCB20) – IOB (PCB17) connector
		Drive transmission of the Fusing pressure release motor (M9) defective Check the gears. If any gears are damaged, replace them. Fusing pressure release motor (M9) defective Replace the Fusing pressure release motor (M9). Connect-Left PCB (PCB20) defective Replace the Connect-Left PCB (PCB20). IOB (PCB17) defective Replace the IOB (PCB17).

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC541-00	D	Fusing Thermistor (Center) Disconnected Error
		Input from fusing thermistor (center) (TS2) is 1019 or more (A/D value) continuously for 4 seconds.
		Connector pin defective Triac defective Fusing unit defective Fusing thermistor connection PCB defective IOB (PCB17) defective Fusing thermistor (center) defective Fusing thermostat defective PSU (PCB18) defective
		Connector pin defective If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign materials, replace the connectors or the units including the connectors.
		Triac defective Disconnect the power cord and check that the resistance between terminals T1 and T2 of the triac TRA31 and triac TRA41 on the PSU (PCB18) are several Mega-Ohms and not shorted. If failed, replace the PSU (PCB18).
		Fusing unit defective Check that no paper jam is present. Reconnect the following connectors. Fusing Unit – Fusing Thermistor Connection PCB connector Fusing Thermistor Connection PCB – IOB (PCB17) connector If the connector is broken, shorted, or grounded, replace the connector. Replace the fusing unit. Fusing thermistor connection PCB defective Replace the fusing thermistor connection PCB.
		IOB (PCB17) defective Update the engine software to the latest version. Replace the IOB (PCB17). Fusing thermistor (center) defective Replace the fusing unit. Fusing thermostat defective Reconnect the following connector. Fusing Unit – PSU (PCB18) connector If the connector is broken, shorted, or grounded, replace the connector. Replace the fusing unit. PSU (PCB18) defective Replace the PSU (PCB18).

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC543-00	D	Fusing Thermistor (Center) High Temperature
		The fusing thermistor (center) (TS2) detects the temperature that exceeds 245 degrees C. The fusing thermistor (center) (TS2) detects the temperature that exceeds 195 degrees C in a heater-off state after the fusing thermistor (center) (TS2) detects the temperature of 155 degrees C or less.
		Connector pin defective Triac defective Fusing thermistor defective IOB (PCB17) defective
		Connector pin defective If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign materials, replace the connectors or the units including the connectors.
		Triac defective Disconnect the power cord and check that the resistance between terminals T1 and T2 of the triac TRA31 and triac TRA41 on the PSU (PCB18) are several Mega-Ohms and not shorted. If failed, replace the PSU (PCB18).
		Fusing thermistor defective Replace the fusing unit. IOB (PCB17) defective Replace the IOB (PCB17).

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC549-00	D	Fusing Lamp Disconnected Error
		The fusing thermistor (center) (TS2) temperature does not reach a temperature of 100 degrees C within 30 seconds after the machine starts warming up.
		Connector pin defective Triac defective Fusing unit defective Fusing thermistor connection PCB defective IOB (PCB17) defective PSU (PCB18) defective Fusing lamp defective
		The fusing thermistor (center) (TS2) detects the temperature that exceeds 235 degrees C. The fusing thermistor (center) (TS2) detects the temperature that exceeds 195 degrees C in a heater-off state after the fusing thermistor (center) (TS2) detects the temperature of 155 degrees C or less.
		Connector pin defective If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign materials, replace the connectors or the units including the connectors. Triac defective Disconnect the power cord and check that the resistance between terminals T1 and T2 of the triac TRA31 and triac TRA41 on the PSU (PCB18) are several Mega-Ohms and not shorted. If failed, replace the PSU (PCB18).
		Fusing unit defective Check that no paper jam is present. Reconnect the following connectors. Fusing Unit – Fusing Thermistor Connection PCB connector Fusing Thermistor Connection PCB – IOB (PCB17) connector If the connector is broken, shorted, or grounded, replace the connector. Replace the fusing unit.
		Fusing thermistor connection PCB defective Replace the fusing thermistor connection PCB. IOB (PCB17) defective Update the engine software to the latest version. Replace the IOB (PCB17). PSU (PCB18) defective Reconnect the following connector. PSU (PCB18) – IOB (PCB17) connector Replace the PSU (PCB18). Fusing lamp defective Replace the fusing unit.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC551-00	D	Fusing Thermistor (End) Disconnected Error
		Input from fusing thermistor (end) (TS1) is 1019 or more (A/D value) continuously for 4 seconds.
		Connector defective or disconnected Connector pin defective Triac defective Fusing thermistor defective Fusing thermistor connection PCB defective IOB (PCB17) defective
		Connector defective or disconnected Reconnect the following connectors. Fusing Thermistor – Fusing Thermistor Connection PCB connector Fusing Thermistor Connection PCB – IOB (PCB17) connector Connector pin defective If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign materials, replace the connectors or the units including the connectors.
		Triac defective Disconnect the power cord and check that the resistance between terminals T1 and T2 of the triac TRA31 and triac TRA41 on the PSU (PCB18) are several Mega-Ohms and not shorted. If failed, replace the PSU (PCB18).
		Fusing thermistor defective Replace the fusing unit. Fusing thermistor connection PCB defective Replace the fusing thermistor connection PCB. IOB (PCB17) defective Replace the IOB (PCB17).

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC553-00	D	Fusing Thermistor (End) High Temperature
		The fusing thermistor (end) (TS1) detects the temperature that exceeds 245 degrees C. The fusing thermistor (end) (TS1) detects the temperature that exceeds 195 degrees C in a heater-off state after the fusing thermistor (end) (TS1) detects the temperature of 155 degrees C or less.
		Connector pin defective Triac defective Fusing thermistor defective IOB (PCB17) defective
		Connector pin defective If the I/F connector pins of the fuser unit and the main unit are deformed owing to foreign materials, replace the connectors or the units including the connectors.
		Triac defective Disconnect the power cord and check that the resistance between terminals T1 and T2 of the triac TRA31 and triac TRA41 on the PSU (PCB18) are several Mega-Ohms and not shorted. If failed, replace the PSU (PCB18).
		Fusing thermistor defective Replace the fusing unit. IOB (PCB17) defective Replace the IOB (PCB17).

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC581-00	C	Temperature Sensor Disconnected Error
		The average of the output from the temperature sensor is 1019 or more for 160 ms. The average of the output from the temperature sensor is 930 or more for 5 seconds.
		Temperature sensor defective IOB (PCB17) defective
		Temperature sensor defective Reconnect the following connector. Temperature Sensor – IOB (PCB17) connector If the connector is broken, shorted, or grounded, replace the connector. Replace the temperature sensor. IOB (PCB17) defective Update the engine software to the latest version. Replace the IOB (PCB17).

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC582-00 SC584-00	C D	Temperature Sensor Shorted Error
		The average of the output from the temperature sensor is 31 or less for 5 seconds.
		Temperature sensor defective IOB (PCB17) defective
		Temperature sensor defective Reconnect the following connector. Temperature Sensor – IOB (PCB17) connector If the connector is broken, shorted, or grounded, replace the connector. Replace the temperature sensor. IOB (PCB17) defective Update the engine software to the latest version. Replace the IOB (PCB17).