Poor black duplex on even pages with HP7210

Hi, I have a printer HP 7210 quite old with duplexor equipped. Until recently, it was printing OK. Now when I print several text pages ot the odd number pages print perfectly, but on the pages of the same part of the text is missing or weak. When I repeat, print pages, the same lines are poor on the corresponding pages. Poor lines are usually towards the end of the printed text (but not necessariy at the end of the page). Does anyone have any suggestions?

Operating system is Pro SP1 Win7 64 bit. No error message. My PC is a Dell Latitude E5520. The HP7210 is connected to my router, but accessible via the laptop wireless.

The first page is 'underprinted' when printing double-sided to allow the ink to dry more quickly.  Looks like your black ink cartridge is insufficient, I would start by checking the ink levels.  The troubleshooting here page can help.

Tags: HP Printers

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