I have a problem of system error of copier ir 2000. how can i solve it?

Hi,
can You be specific by mean of which system error? Like E100? E000?, E001....

Few examples of most common errors:
E100 - Laser trouble - change the drum unit ( complete drum unit )
E000/001 - fixing trouble - try to reset the error under service mode - procedure: press MENU and #, with > key go to CLEAR and OK, find ERR and OK, turn off and back on - if it helps you solved the problem, if not you need to change the thermistors or the fixing lamp, because you have low/high temperature problem.
E019 - waste toner full - remove the drum unit and open the corks on top of the unit and empty/vacume waste toner out.

Hope that helps!