Ricoh 470W sc 302-1 error

[maxexcite]

I have a Aficio 470 W with 30000 meters and the machine after the warmup display the sc 302-1 .
The charge blocks,wire and grid wire they are new.
I have change CGB board without positive result.
Some useful council? thanks
Excused for uncertain English are an Italian technician

[DocF]