Printing only does top half of letters in a sentence

Question

I made the mistake of Registering this product over a year ago as a HP DJ 1510 All in One Printer. Today 1/2/2015, 6 days after my Warranty Expired, lucky me. Today I look again and see that it is a 1512. But each time I do the Diagnostic and Device Name, it comes back as a 1510 Model, it wont recongize the 1512 at all. So what gives?
The reason I was checking on this, is I have been having problems getting my printer to PRINT OUT all the lines in my sentences, I have fading of the lower half of the letters in my sentences, or it will print a full line and then the next line will have a empty streak cuting through all the letters on the 2nd line, and on the 3rd line it dont print at all. I bought the right cartridges, which are #61. I had it in storage for a while, prior to storage, it printed beautifully, since being out of storage, I have been having these problems, ever since i re-hooked up my printer, the cartridge was over half full, now it is about a quarter full.
I will run the so called new HP Diagnostic Tools, under Print and Scan and HP Assistent, and Clean the Cartridges, and then Clean them again, and then run the test page, have it scanned and it will printed a few of the lines and then go back to horizonial streaking letters.
I have run the cleaning and diagnostic over and over again, with the same results. I cant figure it out, why HP still keeps telling me i have a 1510 All in One, when right on my model it says 1512. When I do the device, I have the USB cable running from my computer right into the 1512 All in One, an yet, the diagnosis comes back saying i have a 1510, Im confused and cant get any ONLINE help from HP, because my Warranty expired less than a week ago, what a lame Printer Co.

Answer 1

The "Deskjet 1510 series" includes the Deskjet 1510 and 1512 (and perhaps other Deskjet 151n modesl), do not worry about the printer being referred to as a 1512 or 1510 series.
Your issue is likely due to an electrical contact issue between the cartrdige and the printer.  Printing in Best quality will likely resolve the issue, but will take twice as long to print.... 
The troubleshooting steps in the document here may help resolve the issue.  Print a dignostic page as shown in solution six.  I suspect the black nozzle pattern will be missing a distinct section of the nozzle pattern.  In this case removing the black cartrdige and reinserting it may resolve the issue.  If not then cleaning the electrical contacts on the printer and cartrdige as shown in this document may resolve the issue.  [Note - this last document is for a different cartrdige series, but the cleaning instruction would apply to your printer as well.]  
Bob Headrick,  HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
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