Originally Posted by
Rainer
For me the case has cleared up:
In general, these devices are sensitive to moisture in the paper. The effect that can be seen in the photos is called the "Obiki effect" at Kyocera. It is created by the water evaporating in the fuser unit, which "blows" the toner off before it is fused.
This is also the reason why the service manual specifies a humidity of 36 to 65% for printing with optimal quality, although the printer itself is specified up to 80%.
In my case, two things came together: On the one hand, the paper was "at the limit" with up to (or more?) 65% moisture, on the other hand the firmware was out of date, and Kyocera still carried out some optimizations here.
It is also clear: If the paper is (too) moist, the greater the fusing temperature, the greater the effect.
PS: (Factory default ist "normal 2" for plain paper).
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