I have a sharp 2025

When i start my copier, he just show me L5 and nothing work

This is a magnification Lens movement failure. Turn the machine off then on again to reset. Or try pushing these buttons in sequence: Clear, Repeat, 0, Pause then enter 14 then press the print button.
If none of this fixes the problem you will need a service techine to remove the glass and Lens cover to service the lens drive or lubricated the drive rail.

Hello !

That error code indicates a drive problem with 4th/5th mirror assembly, motor, sensor, board. Your copier has a stepping motor failure and a sensor failure.

Needs to be serviced.

Hope this helps.