You do not know fix out of service Register? About this problem you can learn from this article.
It is quite possible my advice you seem unusual, however has meaning ask himself: does it make sense general repair your Register? may easier will purchase new? I personally think, has meaning least ask, how money is a new Register. For it enough make desired inquiry yandex.
First sense find company by repair registry. This can be done using yandex or corresponding forum. If price repair you would afford - consider question resolved. If cost services for repair you're not satisfied - in this case you will be forced to repair Register their hands.
If you decided own repair, then primarily need learn how repair Register. For it one may use finder, or view archive numbers magazines "Home master", "Model Construction", "Home workshop" and etc..
Think this article least anything could help you solve this problem.