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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.
Do you have the old cartridge? Because the message you are getting makes no sense if you can copy and not print. The chip on the cartridge may be corrupting the machine software.
I will explaine why I say this. LSU fault, is a failure of the laser unit within the printer/copier. If it had failed, you should not be able to copy or print, The machine should not function. The laser unit is what makes the image on the drum. So neither print or copy should work if that was a true LSU code.
Did you purchase a cartridge made by another company other than Xerox? If so try returning it.
As I say, an LSU code should make the machine totally unpoerable, not partially functional.
I would try the old cartridge if you have it to see what happens.
Let me know if you have tried swapping cartridges and I will look into this more for you.