there are no current service notes posted by hp at this time about this subject.
i have seen this problem with reman toners...are you using reman toners?
most of the 4600 series machines i have seen run very dirty as well as the 4500 and 8500 series.
i have heard of a problem hp is having with...
the 4500 will not let you by-pass. it is programed in the printer
it used all the colors to print every color, even black.
your only solution is to do as the printer asks and replace the toner.
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