1.If the machine can't start, check the circuit to see if there is something wrong.
2.If the machine works with low efficiency, check the belt to see if it is loose and check the saws to see if they are wearing.

warranty

The machine will be repaired, replaced or returned for any damage caused by inferior quality of the machine, within half a year from purchasing if users follow instructions of this manual strictly. 

(This warranty applies to the domestic users only).