I have a cs6030 that when you turn on as it warms up the fuser stops and starts and toner feed motor turns on. after it warms up to ready to copy the toner motor keeps running. it will keep feeding toner until it breaks off the small gear on the cartridge. I have replaced the DV unit and the engine, deck PWBs. Any ideas on what might be the problem, I need to find a source of parts for this model if I need to get the main, high voltage , duplex PWB and other parts. Copystar does not have these parts any more. I would appreciate any help. Thanks