Code :

Code: U2-6122, U2-6142
Display: LSU Failure: #. Please turn off then on.
Description: 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.

Code: U3-3113, U3-3114
Display: Original paper jam in front of scanner. Original paper jam inside of scanner.
Description: A document jam was detected in the ADF unit.
Remedy: 1) Remove the jammed paper from ADF unit. 2) If the error persists, turn the machine off then on. 3) If the document jam occurs continually, open the ADF cover-top. Check if the ADF pick up roller is contaminated or worn out. Clean or replace it. 4) If the pick up roller is OK, check the followings. a) Check if the ADF motor is working normally. b) Check if the connector on the ADF joint board is connected correctly. 5) If the problem persists, replace the ADF unit.

Code: U3-3313, U3-3314
Display: Original paper jam in front of scanner. Original paper jam inside of scanner.
Description: A document jam was detected in the ADF unit.
Remedy: 1) Remove the jammed paper from ADF unit. 2) If the error persists, turn the machine off then on. 3) If the document jam occurs continually, open the ADF cover-top. Check if the ADF pick up roller is contaminated or worn out. Clean or replace it. 4) If the pick up roller is OK, check the followings. a) Check if the ADF motor is working normally. b) Check if the connector on the ADF joint board is connected correctly. 5) If the problem persists, replace the ADF unit.