HP4250 black spots

[amirmouh]

Hi All ,
I have a problem when printing I get 4 continous black spots in the middle ...
I ve changed the tonner still the same,cleaned parts of it still the same, I am not a Printer technicien but if an expert can check this ...

[MichaelTech]

Check the transfer roller for defects, and under it for toner. Check the fuser rollers, probably the real issue. Replace it.

[sevenwood]

Check to see if the spotting is equally spaced - If they are 1.5" the defect is in the Toner Cartridge ( Change It )

[cs_steve]

You can also just run a halfway-test, which will tell you if the print defect is coming from the front half of the machine (which means replace toner or transfer roller) or from the back half of the machine (which means replace the fuser).

Here's the instructions for running the halfway test:
http://www.printertechs.com/tech/print-defects/halfwaytest.php

[mattchall]

It's probably the fuser. The fuser film tends to wear out in the middle on the 4250 and 4350's.