Ïðàâèëüíî ïðåäïîëàãàåòå.Ïðîâåðÿéòå öåïü BSI(ñðåäíèé êîíòàêò).Ïîèãðàéòå ñîïðîòèâëåíèåì íà êàáåëå.Ïîñëå êàæäîé ñìåíû ñîïðîòèâëåíèÿ ñíà÷àëà ÷åê,ïîòîì ëîêàë.