Laser power step up,clear the appropriate counter, and recalib. Historious effect. (spelling may be wrong)
Lets say a new drum, takes 1w, to flip from + to -, 100k pages later it takes 1.5w to make the same change, that is is the H effect. your laser is applying 1.5w, when only 1 is needed, because the machine still thinks it needs 1.5w.. so the laser is overexposing the drum, hence a larger toner pull than needed.
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