Samsung MultiXpress X4 Series Service Manual page 476

4. Troubleshooting
4.6.19. U2–xxxx (LSU error)
Error Code Error Message
U2-6121 LSU Failure: #U2-6121. Please turn off then on
U2-6122 LSU Failure: #U2-6122. Turn off then on. Call for service if the problem
persists
U2-6123 LSU Failure: #U2-6123. Please turn off then on
U2-6142 LSU Failure: #U2-6142. Turn off then on. Call for service if the problem
persists
U2-6143 LSU Failure: #U2-6143. Turn off then on. Call for service if the problem
persists
U2–6210 LSU Failure: #U1-6210. Turn off then on. Call for service if the problem
persists
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