my brother DCP130c printer had paper jam. after removing the paper it doesn't will to work and i receive LCD message
print unable 30 see troubleshooting manual
but in the manual nothing appropriate can be found
anybody knows what the 30 means.
it seemed to me that first I read 50, and now 30
I tried Brother directly but still no answer

It seems others have seen this problem with various Brother models, including seeing 50, then 30 - but the solutions offered are hit or miss.

The solution from the Brother Solution Center is the best I can offer - assuming the jam is completely cleared.

I have a brother DCP-120C and whenever it jams, it stops everything, and won't let me print, but usually unplugging it sorts it out. I guess you have thought of that, but just incase, it's worth giving it a try.

Ah, the old reset trick huh? Certainly worth a try.

no, it persists with code 50 or sometimes 30, and at brother nothing can be found, they do not respond to a email query

Did you try the things in the link I included above?