Description: Error #U1-2340 Turn off then on Error #U1-234H Turn off then on
Causes: The temperature control of fuser unit is abnormal.
Remedy: 1) Check if the input voltage is normal. 2) Turn the machine off. Remove and reinstall the fuser unit. Be careful when connecting the AC-connector and Thermistor connector. 3) Turn the machine on. Is the error message is disappeared? 4) Check the followings. If the fuser unit has any problem, replace it. a) Check if the fuser connector is connected properly. b) Check if the halogen lamp voltage is normal. c) Check if the thermistor is contaminated or twisted. 5) If the problem persists, replace the main board or SMPS board.
Code: U2-6122, U2-6142, U2-6143
Description: Error #U2-6122 Turn off then on Error #U2-6142 Turn off then on Error #U2-6143 Turn off then on
Causes: LSU Motor does not work normally. / LSU Hsync signal is abnormal.
Remedy: 1) Check if the LSU harness on the main board is connected properly. 2) If it is OK, check that the LSU harness on LSU board is connected properly. 3) Check if the LSU harness is defective. 4) If the problem persists, replace the LSU. 5) If the problem persists after replacing LSU, replace the main board.