Kyocera mita km-1530

Question

HI,
I have a mita km-1530 that has not been working for sometime. But when I turned it on I found that the copies are too faint and also some blank stripe running accross the page(that is, looking at it on a landscape format). I presumed it was the developer because of the long time the copier has be down. So I changed the developer and also put new toner. On turning the machine it gae me a bloody c710 error code. I found out it is to do with the toner sensor inside the developer unit. I tried resetting the machine by pressing 1087 1087 163 and enter. The machine restarted but the error remains. Tried 1087 1087 251 and enter. But still no success. Please help me get this error sorted without replacing the sensor or buying the entire assy.

ricky