Thank you all for your answers. I read carefully all of your answers.
I did the following steps:
1)print the documents posted by: blackcat4866 (bad quality, i attach photographs of the results) :
Album — Postimages
2)checked the driver, which was already the latest Kx
3)made from printer menu: a)Drum Refresh b) Calibration c)Laser Scanner Cleaning d) DEV CLN (without printing any documents between these actions)
4)Print same document twice (text) I attach photograph with the first and last page of each print) :
4 — Postimages
5)print again documents posted by blackcat4866 (way better print) :
Album — Postimages
6)Print some more documents, with gradually better quality
And this is how test page looked:
5 — Postimages (the upper- right test page, is the one after step 3 ).
Now the quality is back. (test page is completely clear of any marks)
My issue is solved.
I am glad to find your forum
Thank you again
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