nececito saber el cual es el problema en una RICOH aficio 700 el cod de erro es 900

Hola el codigo se refiere alcontador total electr.La posible causa es la placa NVRAM te dejo los codigos del manual. SC900: Electrical total counter error -Definition- [D] The total counter contains something that is not a number. - Possible causes - • NVRAM defective SC901: Mechanical total counter error -Definition- [D] The mechanical counter is not connected. -Possible cause- • Mechanical total counter defective • Mechanical total counter connector not connected