Hope someone can help I am getting this error after the machine warms up and after it starts revolution of the drums it implie that the sensors in the transfer drum are not responding. I have switched the drum and still get the error. I have checked the connectors on the carriage and the drawer connectors in the back all fuses are fine any body have any ideas before I replace the DC driver and/or CPU

solved by blowing out drawer connectors and using some contact spray