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LSU stands for Laser Scanner Unit. Depending on the model this should come up only if the services used required scanning such as copy, fax sending, scanning.
nevertheless if this is a continuous message you might need to check the connectors within the scanner which I advise an field call.
it is only happned when you takes only photocopy ? or Printing... The same will be affect while printing and copying may be the problem related to Laser Supply unit, open the LSU and clean the LSU mirror with a cotton waste. Your issues must be solve.... before that pls. check your cartridge unit...