Sculpfun s10 no more burning

I have the sculpfun s10
but after cleaning the lens it no longer cuts and engraves.
What can I do about it?i have a beam,but no cuts
is there a video showing how to replace the lens?
this is wath do now

you have cleaned lens but it seems to me that you now have to focus you head again, or maybe you have mounted back the lens in the wrong way

I thought I cleaned the lens, and I always focus in the same way, I don’t know either

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