A little more information would help, page count? does tray 2 & side manual feed work good? Does paper stop the same exact place every time? Does the...
That sample is classic example of developer unit being depleted of developer. I swap developer units from other machines all the time with no issues...
I seem to recall that during the kon/min toner shortage I read on this forum that they were shipping half btls? I tried to find reference to that but...