All pictures printed have horizontal lines about 3-4mm apart running through them. This has started after a faulty non hp colour cart stopped the printer working at all. Now have a genuine hp cart installed.
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it sounds as if you may have the picture quality set to draft, its worth a check, especially if printing is ok. Does it print colour writing well too or just black, one of the colour inks may have a block or be low, go into printer settings menu and check what print quality its set for.
I had this trouble, went through cleaning & realignment, then various print options. What i found was that dark colours had faint dark horizontal lines 5mm apart when printing on Photo in the epson driver. Changing it to Best Photo solved it.
For example, if you want to print black and white, when you select PRINT from the menu, you click on PROPERTIES to the right side or bottom side, depending on which windows you use, then select grayscale/black and white, etc in the options that will follow to correctly use your ink, you can always REMOVE the ink from your printer as you only want to print black and white or non color pages.
I found this post to work for me when yellow was not printing on my HP PSC750 after using 2 cartridges: "Well if you want to damage your printer use alcohol. But if you want to
make it work then pull the cartridge from the printer and run hot water
on a couple of paper towels leaving alot of hot water in the towels.
Put some thing under them to keep them from staining your counter top
and then set the cartridge down onto the hotwater towel and let the hot
water melt away the dry ink and in minutes you may be printing again if
this is what it is. Be sure and use a dry paper towel to wipe off the
ecess wet before you reinstall the cartridge."
Depends on whether the "lines" are colored or just blank areas missing in the print . If it is blank areas , then most likely the laser scanner is dirty and the glass needs to be cleaned . If it is colored lines , then you most likely have a defective drum .