SC720-03 to SC792-00

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC720		Finisher SR3230 Error
SC720-03	B	Protection Device Intercept Error 1
		Protection device intercept error state (fuse break) is detected.
		Short-circuit defective Overload defective Motor defective Solenoid defective
		Check if the SC occurs by turning the main power OFF then ON. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. The target parts are all the motors and the sensors. Check if the connector of the target part is connected securely. Reconnect the connector if it is disconnected, or loose. Check the harness for the target part. Replace the harness if it is disconnected, or damaged. Check if the motor runs, sensors turn OFF/ON, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.
SC720-06	C	Access error to NVRAM
		Error occurs when accessing NVRAM.
		Connection failure or malfunction of NVRAM
		Check if the SC occurs by turning the main power OFF then ON. If the SC occurs again, do the following steps. Pull out and reinsert the NVRAM to check if the NVRAM is correctly inserted into the IC socket. If the SC cannot be recovered, replace the main board.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC720		Finisher SR3230 Error
SC720-10	B	Entrance Transport Motor Error
SC720-11	B	Horizontal Transport Motor Error
SC720-13	B	Transport Motor Error
SC720-15	B	Pre-stack Transport Motor Error
SC720-17	B	Exit Motor Error
		Error Condition of -06, -10, -11, -13, -15, -17 Motor driver detects an error (DC motor control error) (1st time is jam notification, 2nd time is SC notification)
SC720-20	B	Lower Junction Gate Motor Error
SC720-24	B	Paper Exit Guide Plate Motor Error
SC720-25	B	Punch Motor Error
SC720-27	B	Punch Unit Movement Motor Error
SC720-28	B	Punch Registration Motor Error
SC720-30	B	Jogger Motor Error
SC720-33	B	Positioning Roller Shift Motor Error
		Error Condition of -20, -24, -25, -27, -28, -30, -33 During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined pulse (1st time is jam notification, 2nd time is SC notification).
SC720-34	B	Positioning Roller Motor Error
		Motor driver detects an error (DC motor control error) (1st time is jam notification, 2nd time is SC notification)
SC720-35	B	Paper Stacking Holder Motor Error
		Motor driver detects an error (DC motor control error) (1st time is jam notification, 2nd time is SC notification) During movement to home, the home position could not be detected within a predetermined time (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined time (1st time is jam notification, 2nd time is SC notification).
SC720-41	B	Stack Feed-out Motor Error
		Motor driver detects an error (DC motor control error) (1st time is jam notification, 2nd time is SC notification) During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined pulse (1st time is jam notification, 2nd time is SC notification).
SC720-42	B	Corner Stapler Movement Motor Error
		During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined pulse (1st time is jam notification, 2nd time is SC notification).
SC720-44	B	Corner Stapler Motor Error
		During movement to home, the home position could not be detected within a predetermined time (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined time (1st time is jam notification, 2nd time is SC notification).
SC720-50	B	Booklet Jogger Motor Error
SC720-51	B	Booklet Jogging Pawl Movement Motor Error
SC720-52	B	Press Folding Motor Error
SC720-53	B	Bottom Fence Motor Error
		Error Condition of -50, -51, -52, -53 • During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). • During movement from home, the home position was detected for longer than a predetermined pulse (1st time is jam notification, 2nd time is SC notification).
SC720-54	B	Fold Roller Motor Error
		Motor driver detects an error (short-circuit and overheating) (1st time is jam notification, 2nd time is SC notification).
SC720-60	B	Booklet Stapler Motor Error
		During movement to home, the home position could not be detected within a predetermined time (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined time (1st time is jam notification, 2nd time is SC notification).
SC720-70	B	Tray Lift Motor Error
		Motor controller detects an error (overload) (1st time is jam notification, 2nd time is SC notification). During descent, the paper surface sensor still detects paper even after a predetermined time (t0sec) elapses (1st time is jam notification, 2nd time is SC notification). During ascent, the paper surface sensor could not detect the paper surface even after a predetermined time (t1sec) elapses (1st time is jam notification, 2nd time is SC notification).
SC720-71	B	Shift Motor Error
SC720-72	B	Shift Jogger Front Motor Error
SC720-73	B	Shift Jogger Rear Motor Error
SC720-74	B	Shift Jogger Retreat Motor Error
		Error Condition of -71, -72, -73, -74 During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined pulse (1st time is jam notification, 2nd time is SC notification).
SC720-75	B	Return Roller Motor Error
		Motor driver detects an error (DC motor control error) (1st time is jam notification, 2nd time is SC notification) During movement to home, the home position could not be detected within a predetermined time (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined time (1st time is jam notification, 2nd time is SC notification).
SC720-80	B	Protection Device Intercept Error 3
		Fuse blowout is detected
SC720-81	B	Shift Roller Drive Motor Error
		Motor driver detects an error (DC motor control error) (1st time is jam notification, 2nd time is SC notification)
SC720-82	B	Edge Guide Motor Error
SC720-83	B	Paper Guide Motor Error
		Error Condition of -82, -83 During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined pulse (1st time is jam notification, 2nd time is SC notification).
		Harness short-circuit -80 only Overload Motor defective Solenoid defective -03, -80 only Connector disconnected Encoder defective -10, -25, -34 -81 only Home position sensor defective
		Check if the SC occurs by turning the main power OFF then ON. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. The target parts are the motor and related HP sensor that SC occurred. Check if the connector of the target part is connected securely. Reconnect the connector if it is disconnected, or loose. Check the harness for the target part. Replace the harness if it is disconnected, or damaged. Check if the motor runs, sensors turn OFF/ON, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC722		Finisher SR3210 (D3B8) Error
SC722-03	B	Protection Device Intercept Error 1
		Fuse blowout is detected
SC722-06	C	See the descriptions next table below.
SC722-10	B	Entrance Transport Motor Error
		Motor driver detects an error state (DC motor control error) (1st time is jam notification, 2nd time is SC notification).
SC722-11	B	Proof Transport Motor Error
		Motor driver detects an error state (DC motor control error) (1st time is jam notification, 2nd time is SC notification).
SC722-17	B	Paper Exit Transport Motor 2 Error
		Motor driver detects an error state (DC motor control error) (1st time is jam notification, 2nd time is SC notification).
SC722-24	B	Paper Exit Guide Plate Open/Close Motor Error
		During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined pulse (1st time is jam notification, 2nd time is SC notification).
SC722-25	B	Punch Unit Drive Motor Error
		During movement to home, the home position could not be detected within a predetermined time (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected even after a predetermined time elapsed (1st time is jam notification, 2nd time is SC notification). Output from the encoder could not be counted for a predetermined number of times within a predetermined time (1st time is jam notification, 2nd time is SC notification).
SC722-27	B	Horizontal Registration Unit Transfer Motor Error
SC722-28	B	Horizontal Registration Correction Motor Error
SC722-30	B	Jogger Motor Error
SC722-33	B	Positioning Roller Motor Error
SC722-41	B	Feedout Pawl Motor Error
		During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected even after a predetermined pulse elapsed (1st time is jam notification, 2nd time is SC notification).
SC722-42	B	Stapler Transfer Motor Error
		During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected even after a predetermined pulse elapsed (1st time is jam notification, 2nd time is SC notification). During movement from home, retreat sensor ON could not be detected even after a predetermined pulse elapsed (1st time is jam notification, 2nd time is SC notification). During initialization, retreat sensor ON was detected simultaneously when the home position is detected (1st time is jam notification, 2ndbtime is SC notification).
SC722-44	B	Stapler Motor Error
		Motor driver detects an error (short-circuit or overheating) (1st time is SC). During movement to home, the home position could not be detected even after a predetermined time elapsed (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected even after a predetermined time elapsed (1st time is jam notification, 2nd time is SC notification). During motor drive, the output from the encoder could not be counted for a predetermined number of times within a predetermined time (1st time is jam notification, 2nd time is SC notification).
SC722-45	B	Stapleless Stapler Transfer Motor Error
		Motor driver detects an error (short-circuit or overheating) (1st time is SC). During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected even after a predetermined pulse elapsed (1st time is jam notification, 2nd time is SC notification).
SC722-46	B	Stapleless Stapler Motor Error
		Motor driver detects an error (short-circuit or overheating) (1st time is SC). During movement to home, the home position could not be detected even after a predetermined time elapsed (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected even after a predetermined time elapsed (1st time is jam notification, 2nd time is SC notification).
SC722-47	B	Paper Guide Drive Motor Error
		During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined pulse (1st time is jam notification, 2nd time is SC notification).
SC722-70	B	Tray Lift Motor Error
		Motor driver detects an error (short-circuit or overheating) (1st time is SC). During descent, the paper surface sensor still detects paper even after a predetermined time (t0sec) elapses (1st time is jam notification, 2nd time is SC notification). During ascent, the paper surface sensor could not detect the paper surface even after a predetermined time (t0sec) elapses (1st time is jam notification, 2nd time is SC notification).
SC722-71	B	Shift Motor Error
SC722-81	B	Paper Guide Drive Motor
		During movement to home, the home position could not be detected within a predetermined pulse (1st time is jam notification, 2nd time is SC notification). During movement from home, the home position was detected for longer than a predetermined pulse (1st time is jam notification, 2nd time is SC notification).
		Overcurrent (-03 only) Staple jam (-44 only) Encoder error (-11, -11, -25, -44) Motor defective Connecter disconnected, or loose Motor overload HP sensor defective Paper surface sensor defective (-70 only)
		Check if the SC occurs by opening/closing covers, and input/output check. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. The target parts are the motor and related HP sensor that SC occurred. Check if the connector of the target part is connected securely. Reconnect the connector if it is disconnected, or loose. Check the harness for the target part. Replace the harness if it is disconnected, or damaged. Check if the motor runs, sensors turn OFF/ON, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC727		Internal Multi-fold Unit FD3000 Error
SC727-01	B	Connection Error to Downstream Unit
		Communication error has occurred with the serial interface of the downstream unit. This is displayed as an SC code from its initial detection.
		Harness defective Downstream unit defective Controller board defective I/F connector defective
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Turn the power off, disconnect the interface connector connected to the machine, connect the interface connector of the downstream unit to the machine, and then turn the power on. If the downstream unit does not operate, resulting in connection error, there is a problem with the downstream unit, so repair the downstream unit. Check the harness connections between the controller board and each connector. Replace the harness if it is damaged, or connect it if it is disconnected. Check if there are any signs of a short circuit. Replace the parts if there are any defects.
SC727-03	B	Protection Device Intercept Error 1
		Fuse (FU3) break is detected 24-V power supply line error This is displayed as an SC code from its initial detection.
		Fuse (FU3) is blowout Controller board defective 24-V harness entrapment (short circuit)
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. The target parts are all the motors and the sensors. Check that the harness between the PCB and motor/solenoid is not stripped or entrapped. Replace the harness if there are any defects. Rotate each motor shaft by hand to check for any overload. Replace the motor if there are any defects. Check if there is any unusual odor from the solenoid or any problem with its appearance. Replace the solenoid if there are any defects. Check if there are any signs of a short circuit on PCB. Replace the PCB if there are any defects.
SC727-04	B	Protection Device Intercept Error 2
		Poly-switch (FU4) break is detected Limit line disturbances from inrush currents has occurred to the interlock system. This is displayed as an SC code from its initial detection.
		Poly-switch (FU4) trip (Trip refers to the phenomenon whereby an overcurrent flows into the poly-switch, resulting in high resistance.) Controller board defective 24-V harness entrapment (short circuit)
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON, submitting a job, feeding paper, opening/closing covers, and input/output check. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. The target parts are all the motors and the sensors. Check that the harness between the PCB and the motor/solenoid is not stripped or entrapped. Replace the harness if there are any defects. Rotate each motor shaft by hand to check for any overload. Replace the motor if there are any defects. Check if there is any unusual odor from the solenoid or any problem with its appearance. Replace the solenoid if there are any defects. Check if there are any signs of a short circuit on PCB. Replace the PCB if there are any defects.
SC727-06	C	NVRAM Error 1
		An error has occurred during an access to the NVRAM. This is displayed as an SC code from its initial detection.
		NVRAM is disconnected, or defective
		Turn the main power OFF then ON after checking whether there are no foreign objects (such as remaining paper) in the tray. If the SC occurs again, replace the controller board.
SC727-10	B	Transport Motor Error
		Motor error (Encoder error) This is reported as a jam error when detected for the first time. If it occurs again in a row, its SC code appears.
		Motor defective Motor harness entrapped (short circuit or breaking of wire) Connector disconnected Controller board defective
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON, submitting a job, feeding paper, opening/closing covers, and input/output check. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step Check if all connectors between the controller board and the motors are connected securely. Reconnect the connectors if they are disconnected, or loose. Replace the harness if it is disconnected, or damaged. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.
SC727-12	B	Registration Motor Error
		Motor error (Encoder error) This is reported as a jam error when detected for the first time. If it occurs again in a row, its SC code appears.
		Motor defective Motor harness entrapped (short circuit or breaking of wire) Connector disconnected Controller board defective
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON, submitting a job, feeding paper, opening/closing covers, and input/output check. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Check if all connectors between the controller board and the motors are connected securely. Reconnect the connectors if they are disconnected, or loose. Replace the harness if it is disconnected, or damaged. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.
SC727-20	B	JG Crease Motor Error 1
		Motor error (Encoder error) The junction gate is not at the HP position. This is reported as a jam error when detected for the first time. If it occurs again in a row, its SC code appears.
		Motor defective Motor/sensor harness entrapped (short circuit or breaking of wire) Connector disconnected Junction Solenoid HP Sensor defective Controller board defective
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON, submitting a job, feeding paper, opening/closing covers, and input/output check. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Check if all connectors between the controller board and the motors/sensors are connected securely. Reconnect the connectors if they are disconnected, or loose. Replace the harness if it is disconnected, or damaged. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if the sensor turns OFF/ON. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.
SC727-39	B	1st Fold Motor Error
		Motor error (Encoder error) This is reported as a jam error when detected for the first time. If it occurs again in a row, its SC code appears.
		Motor defective Motor harness entrapped (short circuit or breaking of wire) Connector disconnected Controller board defective
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON, submitting a job, feeding paper, opening/closing covers, and input/output check. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Check if all connectors between the controller board and the motors are connected securely. Reconnect the connectors if they are disconnected, or loose. Replace the harness if it is disconnected, or damaged. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.
SC727-41	B	JG Crease Motor Error 2
		Motor error (Encoder error) Crease Roller is not at the HP position. This is reported as a jam error when detected for the first time. If it occurs again in a row, its SC code appears.
		Motor defective Motor/sensor harness entrapped (short circuit or breaking of wire) Connector disconnected Crease HP Sensor defective Controller board defective
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON, submitting a job, feeding paper, opening/closing covers, and input/output check. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Check if all connectors between the controller board and the motors/sensors are connected securely. Reconnect the connectors if they are disconnected, or loose. Replace the harness if it is disconnected, or damaged. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if the sensor turns OFF/ON. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.
SC727-71	B	2nd Fold Motor Error
		Encoder error This is reported as a jam error when detected for the first time. If it occurs again in a row, its SC code appears.
		Motor defective Motor harness entrapped (short circuit or breaking of wire) Connector disconnected Controller board defective
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON, submitting a job, feeding paper, opening/closing covers, and input/output check. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Check if all connectors between the controller board and the motors are connected securely. Reconnect the connectors if they are disconnected, or loose. Replace the harness if it is disconnected, or damaged. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.
SC727-72	B	The power supply for the sensor is defective.
		The power supply for the sensor (5V_SN) is defective. This is displayed as an SC code from its initial detection.
		Sensor harness entrapped (short circuit or breaking of wire) Sensor defective Controller board defective
		Turn the main power OFF then ON after checking whether there are no foreign objects (such as remaining paper) in the tray. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Check if the harness is connected to the wrong sensor. Reconnect the connector if there are any defects. Replace the harness if it is disconnected, or damaged. Check if the sensor turns OFF/ON. Replace the parts if there are any defects. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC745		Mail Box CS3010 Error
SC745-03	D	Protection Device Intercept Error 1
		Protection device intercept error state (fuse break) is detected.
		Harness short-circuit Motor defective Solenoid defective
SC745-04	D	Protection Device Intercept Error 2
		Protection device intercept error state (fuse2 break) is detected.
		Harness short-circuit Motor defective Solenoid defective
SC745-80	D	The entrance fan motor lock is detected.
		The entrance fan motor lock is detected.
		Motor defective Harness broken Connector disconnected Controller board detective
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Check if all connectors between the controller board and the motors/sensors are connected securely. Reconnect the connectors if they are disconnected, or loose. Replace the harness if it is disconnected, or damaged. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if the sensor turns OFF/ON. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC761		Bridge Unit BU3070 (D685) Error
SC761-03	B	Protection Device Intercept Error 5V
SC761-04	B	Protection Device Intercept Error 24V
		Fuse blowout occurs due to over current during power injection (output detected for longer than 2 seconds).
		Over current of bridge unit motor Over current due to short-circuit in PCB
		Replace the bridge unit or side tray. Replace the PCB of bridge unit or side tray.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC780-01	D	Bank 1 (Upper optional paper tray) Protection Device Intercept Error
		When original source of 5V power supply is ON, protection device intercept of 24V power system is detected.
		In 24V power supply system: Motor defective Solenoid defective Harness short- circuit
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Check if all connectors in tray 1, 2, and optional upper tray are connected securely. Reconnect the connectors if they are disconnected, or loose. Check the harness in tray 1, 2, and optional upper tray. Replace the harness if it is disconnected, or damaged. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC781-01	D	Bank 2 (Lower optional paper tray) Protection Device Intercept Error
		When original source of 5V power supply is ON, protection device intercept of 24V power system is detected.
		In 24V power supply system: Motor defective Solenoid defective Harness short- circuit
		Remove the jammed paper or slip of paper from the tray, and check if the SC occurs by turning the main power OFF then ON. If the SC occurs again, do the following steps. Check if the SC reoccurs by cycling the power after each step. Check if all connectors in tray 1, 2, and optional upper/lower trays are connected securely. Reconnect the connectors if they are disconnected, or loose. Check the harness in tray 1, 2, and optional upper/lower trays. Replace the harness if it is disconnected, or damaged. Check if the motor runs, has no overloads, and is properly driven. Replace the parts if there are any defects. Check if there are any signs of a short circuit. Replace the parts if there are any defects.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC791-00	D	No Bridge Unit when Finisher is Present
		When power supply is switched on or paper is transported, finisher set is detected but bridge unit set is not detected. (during internal finisher connection, not detected)
		Bridge unit not attached Bridge unit defective
		Reset the bridge unit. Turn the main power off/on.

SC No.	Type	Error Name/Error Condition/Major Cause/Solution
SC792-00	B	No Finisher, Bridge Unit Provided
		When power supply is switched on, it is recognized there is no finisher, and a bridge unit is fitted.
		Finisher connector set incorrectly In a machine which has a bridge unit connected, a finisher is not fitted Finisher defective
		Connect finisher or disconnect bridge unit, and turn the main power off/on.