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HP OfficeJet Pro 6970 keeps failing printing

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Last Modified: 2020-06-22
Have a user where I just installed a new HP OfficeJet Pro 6970 via USB.  Works for a day and then problem starts where printing anything produces black lines across the paper.  I've tried changing usb cables, changing usb port on pc connected to from USB 1.1 slots to 2.0 slots, disabling anti-virus, rebooting to no avail.  Copying on the AIO works fine.  I've checked the event logs, but nothing really jumps out.  Scanning can get bad as well.  Seems to be some communications thing, but I don't know.  it doesn't look like anything is starting up out of the ordinary that's interfering with it either.  Only "fix" is to uninstall the drivers and accompanying HP software, and reinstall it from scratch.  This only resolves it temporarily.  Need help!
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Robert RComputer Service Technician
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I strongly agree with Dr Klahn that HP officejet printers are not the best printers, I have more service calls on HP officejet printers then any other printer manufacturer. I dont think the problem is that HP sells more of these types of printers than anyone else, but it is the quality of the printer itself.
But since you have the printer and probably cant take it back, I would reinstall the drivers and if that does not resolve the issue exchange it for another printer as Dr Klahn stated. You have tried everything else. Often when it is blank lines going across the page the cartridge maybe bad or the print head needs cleaning. But black lines, is a little unusual. Try running a couple cycles of cleaning to see if that helps. Mind you the cleaning process does use up quite a bit of ink and may not resolve the issue. 
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You seem to have a couple of issues. One is printing, the other is scanning. Weirdly, copying is fine, even though that involves both scanning and printing.

The printing problem could be either a a printing problem or a driver issue. But then the weird thing is that scanning does not involve the print driver.

Assuming it's not a hardware issue, I would suggest 2 things: completely reinstalling all HP s/w, and doing a factory reset on the printer.

To reinstall, go to Devices & Printers and delete the printer. Now go to Control Panel > Programs & Features and uninstall anything relating to the printer. Go back to Devices & Printers, click on any other printer driver and then click on Print Server Properties in the menu that pops up. Click the Drivers tab and remove any instance of the printer. Then reinstall from scratch.

For the factory reset, as usual HP's documentation is seriously lacking, but this Youtube video gives instructions. You may want to print a configuration page before you do this, so you'll now what the printer's settings (e.g. IP address, etc) are. To print a config page, follow these instructions:
From the home screen on the printer control panel, swipe down to open the Dashboard, and then touch the Setup icon . Swipe up on the display, and then touch Reports. Touch Network Configuration Report. A Network Configuration Page prints up to three pages of information. 
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or test this printer and all his functions on another pc

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Thanks for the answers so far.  An interesting wrinkle is the printer is shared for another pc.  That pc can print with no problem while the "print server" pc can't.  I have never seen that before.
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can you print  if the printer is connected directly  -not shared?  you may have teo redo the sharing  

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Nobus - Are you referring to being able to print from the problematic "print server" pc or the one that shares the problematic pc's direct usb connection?
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I cannot see how sharing can cause black lines on the prints

As the other PC can print fine, it has to be the driver. Hence re-installing on the print server is still my recommendation..

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hdhondt - When you install the drivers on the 2nd pc that connects to the print server pc, it pulls the drivers from the print server.  If the drivers are bad, they should be bad on the 2nd pc too. As mentioned previously, I had reinstalled the drivers already, and that only resolves the issue for a short time (hours to 1 day), and the issue occurs again on the print server.  I have reinstalled twice with same results.
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in short - my suggestion was to test the printer connected directly onn bpth systems, to check if that is ok
then you can advance 1 step
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The 2nd pc only gets the drivers from the print server when you install it. If something happens to the print server drivers after that, it does not affect the 2nd pc.

If a full reinstall fixes it for a while, that tells us that something on the server (but not on the other pc) corrupts the driver, and we need to figure out what that is.

Is there any unusual software running on the server? Does it have up-to-date anti-virus software? Has it done a full scan since the problem started? 

Try running SFC /SCANNOW from an elevated command window to see if there are any other issues. 
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