Service Manual KM 4750/4050 Follow
Link of Service Manual: bizhub4750_4050ServiceManual.pdf
This is the Service Manual of KM 4750/4050, it will help you to find solutions to all the Error codes may encounter. Also, it can guide you in dissembling and assembling specific parts of the machine, like developing unit, drum, transfer belt unit and fusing unit.
It may serve as a tool for you to know all the components and parts of the machine and how you can maintain every parts.