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with an lsu error the paper will get to the cartridge and the laser scanning unit will start charging the transfer drum, at this point the printer realises the laser scanning unit isnt working properly and stops all operation hence the paper stopping at that point, usually this means a replacement lsu which unfortunately isnt deemed a "user serviceable part" contact a service centre armed with this information and your better placed to get a speedy repair
Usually with this printer, you just simply turn it off and then on again and the lights will stop flashing.
This is an LSU (Laser Scanner Unit) error.
If you still have the problem, it might be either the LSU needs replacing or it could be the main board. These parts might be scarce though and very expensive.
It might almost be cheaper to buy new printer but that is up to you to check and decide for yourself.