I am working on this Canon IR Adv 6075. The first error was E065-0001. I replaced the Primary Charging assembly but error remains. I removed and clean the Primary Grid High Voltage connector. Check all the connectors in the High Voltage Unit. Now the error becomes E068-0001. Clean the Pre Transfer High Voltage connector but error remains. I'm inclined into replacing the Pre Transfer Charger Assembly. I have cleaned and checked the Pre Transfer Assembly and it looks ok. Any ideas? Thanks for your help