• Code: U1-2337, U1-233D
• Display: Fuser Unit Failure: #U1-2337. Fuser Unit Failure: #U1-233D
• Description: When the fuser warms-up, the temperature of the thermistor is abnormally low.
• Remedy: 1) Turn the machine off. Re-install the fuser unit, then turn the machine on. 2) Check if the power voltage is normal. (Is the voltage during the operation ±10% of the rated voltage?) 3) Remove the fuser unit. After opening the jam cover, check if jammed or wrapped paper is in the fuser unit. 4) If the problem persists, Check the follows. a) Check if the Halogen lamp (110V : 4713-001630 / 220V : 4713-001631) is broken or disconnected. b) Check if the AC connection of the Halogen lamp is disconnected or contaminated. c) Check if the thermostat(4712-001098) is disconnected. d) Check if thenon-contact type thermistor(1404-001453) is broken. 5) If the problem persists, replace the Fuser unit(110V : JC91-01064A, 220V : JC91-01063A). 6) If the problem persists, replace the Main board(JC92-02429A) or FDB board(110V : JC44-00210A, 220V : JC44-00211A), SMPS(110V : JC44-00093A, 220V : JC44-00100A)

• Code: U2-6121, U2-6122, U2-6123
• Display: LSU Failure #U2-6121: Turn off then on. LSU Failure #U2-6122: Turn off then on. LSU Failure #U2-6123: Turn off then on.
• Description: LSU motor does not operate or it operates abnormally. Motor ready signal is abnormal.
• Remedy: 1) Turn the machine off then on. Check for the LSU motor operation sound during warm-up. 2) Print a demo page to check that the machine operates normally. 3) If the problem persists, check the following : a) If the LSU motor makes a sound, i) Enter SVC mode to check the LSU motor ready signal. ( Diagnostics > Engine Diagnostics > Engine Test Routines) • Press 1,2,3 number keys simultaneously. When the password dialog box appears, enter “1934” and press the “OK” button. ii) Select “LSU Motor1 Run Ready”. ( Diagnostics > Engine Diagnostics > Engine Test Routines > 110-0000) iii) Press ‘Start’ button. Check that the status has changed to ‘Executing -> Low -> High’. iv) If the status has not changed, the motor ready signal is abnormal. Replace the LSU. (JC97-04010A) (Refer to 3.3.5. LSU in chapter 3) b) If the LSU motor does not makes a sound, i) Turn the machine off and open the side cover. Unplug and reconnect the LSU cable. Check that the LSU motor make a sound after turning the machine on. ii) Turn the machine off and remove the rear cover. Unplug and reconnect the LSU cable on main board. Check that the LSU motor make a sound after turning the machine on. iii) If the LSU cable(JC39-01688A) is defective, replace it. Check that the LSU motor make a sound after turning the machine on. iv) If the problem persists, replace the LSU(JC97-04010A).

• Code: U2-6142, U2-6143
• Display: LSU Failure #U2-6142: Turn off then on. LSU Failure #U2-6143: Turn off then on.
• Description: Hsync signal of the LSU is abnormal.
• Remedy: 1) Turn the machine off then on. Check for the LSU motor operation sound during warm-up. 2) Print a demo page to check that the machine operates normally. 3) If the problem persists, check the following : a) Turn the machine off and open the side cover. Unplug and reconnect the LSU cable. Print a demo page to check that the machine operates normally. b) Turn the machine off and open the side cover. Unplug and reconnect the LSU cable on main board. Print a demo page to check that the machine operates normally. c) If the LSU cable(JC39-01688A) is defective, replace it. Check that the LSU motor makes a sound after turning the machine on. d) If the problem persists, replace the LSU(JC97-04010A).

• Code: U3-3211, U3-3213, U3-3214, U3-3311, U3-3313, U3-3314
• Display: Original paper jam inside of scanner
• Description: Jam has occurred inside the DADF unit.
• Remedy: 1) Open the DADF cover. If there is jammed paper, remove it. 2) If this error occurs continually, check the DADF regi. sensor(0604-001393) and regi actuator(JC66-03148A). If their operation is abnormal, replace the defective part. 3) If the regi sensor is OK, check the scan sensor(0604-001393) and scan actuator(JC66-03210A). If their operation is abnormal, replace the defective part. 4) Check if the regi. clutch operates normally. Check if the clutch cable is connected correctly. If the clutch(JC47-00033A) is defective, replace it.

• Code: U3-3411, U3-3413, U3-3414
• Display: Original paper jam inside of scanner.
• Description: Jam has occurred inside the DADF unit.
• Remedy: 1) Open the DADF cover. If there is jammed paper, remove it. 2) If this error occurs continually, check the following: a) Check if the Regi. actuator(JC66-03148A) operates normally. b) Check if the Regi. sensor cable is connected correctly. c) If the connection is OK, replace the Regi. sensor(0604-001393).

• Code: U3-3511, U3-3513, U3-3514
• Display: Original paper jam inside of scanner.
• Description: Jam has occurred inside the DADF unit.
• Remedy: 1) Open the DADF cover. If there is jammed paper, remove it. 2) If this error occurs continually, check the following: a) Check if the scan actuator(JC66-03210A) operates normally. b) Check if the scan sensor cable is connected correctly. c) If the connection is OK, replace the scan sensor(0604-001393).

• Code: U3-3711, U3-3713, U3-3714
• Display: Original paper jam in the exit area of scanner
• Description: Jam has occurred inside the DADF unit.
• Remedy: 1) Open the DADF cover. If there is jammed paper, remove it. 2) If this error occurs continually, check the following: a) Check if the exit actuator(JC66-03184A) operates normally. b) Check if the exit sensor cable is connected correctly. c) If the connection is OK, replace the exit sensor(0604-001393).

• Code: U3-4210
• Display: Top door of scanner is open.
• Description: DADF cover is open.
• Remedy: 1) Close the DADF cover properly. 2) If this error occurs continually, Check the following: a) Check the DADF cover open sensor(0604-001393) and its harness. If there is a defective part, replace it. b) If both of them are normal, check the Cover-Open Rib. If it is broken, replace the Cover-Open(JC63-03273A).