Hello all.
Problem with printing grey dots (see photo).
It makes at all C, M, Y, Bk pattern printed all together, also only M print alone, also only Y print alone, also only C print alone, also only Bk print alone (maybe not so significantly).
I checked all drums, transfer belt, fixing unit (it makes in front off fixing unit, I make stop the paper in front of fixing unit), transfer roller was vacuumed - but still the grey dots. Visually nothing (charging rollers at drums perfectly clear without defects).
I forgot to change drums in its positions (now I am not sure, that the drums are interchangeable). The black developing unit looks good, but...
The dots are in the direction of the paper path.
I did not know, what is faulty (and did not say it to customer).
Any ideas please?
IMG_1601.jpg
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