Following is LSU errors that we often encounter during use Samsung SCX 6545N printer: - LSU error: #04-000. Please turn off then on - LSU error: #04-001. Please turn off then on - LSU error: #04-002. Please turn off then on Currently, multi-function printers SCX-6545n is being used quite extensively. With multiple functions: fax, photocopy, print, scan it helps a lot for a small office area. Samsung SCX-6545n printer also has advantages following: print speed, copy speed, sharp pages printed, toner saving and easy to use. However, we can not avoid the damage of the printer as some components of the printer caused in during use. Error messages can appear on the "Smart Panel" program window or on the control panel monitor to show machine status or errors. The cause of "LSU error: #02-001. Please turn off then on": LSU motor does not operate. The cause of "LSU error: #02-002. Please turn off then on": After LD on, the Laser beam detect signal is not occurred or irregular The cause of "LSU error: #04-002. Please turn off then on": LSU motor does not operate or the drive signal is abnormal. Instruction to fix LSU error for Samsung Scx-6545N Printer(See more details in Samsung Scx-6545N Service Repair Manual) 1. After checking the LSU motor rotation noise, check the motor signal. 2. Check the Beam Detecht signal. If there is a BD signal, replace the Main board. If or not, check the LD contol signal. 3. Check the LD Power is normal. 4. If it is normal, check the light receving part. 5. After checking the LSU motor rotation noise, check the motor signal. You can find solutions fix other errors of Samsung SCX-6545n printer in "Samsung Scx 6545N Service Repair Manual". The following is table of message error of Samsung SCX-6545N Samsung Scx-6545n Service Repair Manual document very important with technician when repair the Samsung SCX-6545N printer. "Samsung Scx-6545n Service Repair Manual" guide technician remove and install components internal Samsung SCX-6545n printer, providing them knowledge intensive the component, how to take apart and fix bugs in the process of using Samsung SCX-6545N printer that the user themselves can not repair.