HP LaserJet 2100 Toner distribution

Feb 13, 2014

I have the above printer and am noticing inconsistent toner distribution when printing certain types of output. For example, text is fine but printing a solid black 2cm x 2cm square exhibits a strong black edge, but towards the centre the toner begins to "thin out". Economode is set to off.

I'm guessing it is not the toner cartridge as it is not a general thinning; it only effect blocks of black (and again, the edge is ok, but the larger the area, the more pronounced the issue).

It is possible a failing fuser unit would cause this?
Does toner "go off" possibly contributing to issues with adhesion to the paper?
Is this a general issue with this printer?

Was wondering if anyone can shed any light.

many thanks

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