Originally Posted by
Counsel
Most of the reasons for light copies such as toner bottle mylars and ID sensor being dirty result in some sort of error. Dirty ID sensor usually gives off a 300 something sc code at some point, toner hopper mylars usually end with an Add toner warning or msg. When you read through the vsp,vsg post you should notice the vsg should be at like 4.0 which is the ID sensor reading off the bare drum if that number is 4.0 or +/- 0.2 then your ID sensor is likely reading the drum correctly, if your vsp is high even with a correct ID sensor reading then your not getting enough toner in the developer unit. If your vsg is off then your ID sensor could be dirty or you have a bad drum surface, this is going to affect your vsp readings.
Its a good chance your do for PM and probably need to replace the developer, pcu parts, and transfer unit. Swapping an already initialized developer unit from one machine to another may not yield better results.
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