Adding/changing copier developer

I tried finding the owners manual to this one and couldn't find one on Gestnetners website.

Usually the developer has to be done by removing the previous developer from the unit. Usually it has to be vacumed out. The delevloper is evenly applied and requires a service code to calibrate it.

Usually it requires a service technician to do it because if it isn't done properly it can cause copy quality problems since the toner to developer ratio has to be correct.

It isn't an easy thing to do as it is to replace the toner.