I don't know if this helps, http://www.china-cncrouter.com//down...7282452561.pdf I have had a quick look and the only info I see about motor current is that it is set at 1.8A.

You might have to open up the box to see what board is inside to find out how to check and set driver currents.

Here's a website that might have some thing of use :-
http://www.chinacnczone.com/en/china...czone_l49.html

Cheers,

Rob