Dirty mark on duplex pages

[alan639]

Black mark near bottom right corner of second side when printing duplex.  Much worse immediately after fitting new black cartridge.

[asmita6658]

Hi @alan639

Welcome to the HP Support Community. 

To better assist you - 

1) Are you using a genuine HP ink? 

2) Are you experiencing this issue while making a copy as well? 

While you respond to that, try the steps mentioned in this document.  

Hope this helps! Keep me posted. 

Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

Have a great day! 

[alan639]

Thanks for replying. (1) Yes I'm using genuine ink. (2) I have tried a double-sided copy, and there are no dirty marks, but the problem is intermittent; I might have to make a large number of copies to be sure about this.  I looked at the document: it seems to be about error messages (I have had none) and problems with the cartridges and printhead, which I doubt are relevant, since the actual printing is absolutely fine.  A Print Quality Diagnostic Page comes out perfect.  The dirty marks are always in the same place: about 1cm up from the bottom, extending about 1cm in from the right edge (I'm using A4 paper).

I have just now followed instructions and updated the firmware, but I'd be surprised if this affects the problem.

Thank you.

[asmita6658]

@alan639

Have you tried cleaning the cartridges and the printheads? If the issue still persists, try cleaning the rollers on the duplexer. Refer to Step#3 "Clean the rollers in the duplexer" from this document. 

Keep me posted. 

[alan639]

I haven't tried cleaning the cartridges (it was when I fitted a new black cartridge that the problem got worse).  I have tried cleaning the rollers (duplexer and inside the printer, front and rear) as per the document.  So far so good, on a short print job; it would be expensive doing a long run just to check this.  I will get back to you if the problem reappears.

[asmita6658]

Sure @alan639

Have a great day!