Samsung SCX8123NA

• 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: • U1-2337 : Error occurs at non-contact type Thermistor • U1-233D : Error occurs at contact type Thermistor 1) Turn the machine off. Re-install the fuser unit, then turn the machine on. (Refer to 3.2.2 Fuser unit) 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 : 4713-001632 / 220V : 4713-001633) is broken or disconnected. b) Check if the AC connection of the Halogen lamp is disconnected or contaminated. c) Check if the thermistat(4712-001098) is disconnected. d) Check if the contact type thermistor(1404-001567)or Non-contact type thermistor(1404-001453) is broken. 5) If the problem persists, replace the Fuser unit(110V : JC91-01049A / 220V : JC91-01050A). 6) If the problem persists, replace the Main board(JC92-02452A) or FDB board(110V : JC44-00210A, 220V : JC44-00211A), SMPS(110V : JC44-00093A, 220V : JC44-00100A)

• Code: U2-1111, U2-1112, U2-1113, U2-1114
• Display: LSU Failure: #. Turn off then on.
• Description: LSU motor does not operate of 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 and check the printout is normal. 3) If the problem persists, check the following: • If the LSU motor makes a sound, a) By SVC mode, Check if the motor ready signal is occurred. (Diagnostics > Engine Diagnostics > Engine Test Routines > 110-0000) b) If not, open the side-cover and replace the LSU(JC97-04017A) • If the LSU motor does not make a sound, a) Unplug and reconnect the LSU flat cable connecting the LSU. Then check the operation sound of LSU. b) Unplug and reconnect the LSU flat cable on main board. Then check the operation sound of LSU. c) If the LSU flat cable is defective, replace FFC(JC39-01657A) d) If the LSU cable is OK, replace the LSU(JC97-04017A)

• Code: U3-3113, U3-3211, U3-3212, U3-3213, U3-3214, U3-3312, 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 a 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 a 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: U3-3311, U3-3313
• 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: U3-3411, 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: U3-3711, U3-3713, U3-3714
• Display: Original paper jam in the exit area of scanner
• Description: Original jam has occurred inside the DADF unit.
• Remedy: 1) Open the DADF cover. If there is a jammed paper, remove it. 2) If this error occurs continually, check the followings. 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).