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Usually this means that the paper can't be picked up. First take out the paper and check for curled edges or wrinkled paper. Discard damaged pages. Check for torn corners and remove any small foreign objects. Make sure that the paper is aligned properly when you return the paper to the tray. If you only have a few sheets in the paper tray, add more paper.
Next check if the rollers are dirty. They can be cleaned with a damp lint-free cloth. (Just a little water is needed.) Check that the feed mechanism is undamaged. My home inkjet printer (an HP OfficeJet 7000) had a part of the paper lift mechanism break a few days ago. If you pushed the top sheet of paper just right, the printer would still pick it up. We noticed a loose piece when we opened the back of the printer for the straight-through paper feed. After attempting to replace that piece, we looked closer and another part fell out of the printer.
Some find it worthwhile to take apart the printer and re-attach the parts. If the printer is still under warranty, let HP do the job.
You pick-roller is to dirty and need cleaning.take a clean cotton or cloth peace and with spirt clean the roller.If you look in the paper tray you will see the pick-up roller.Replay if you need futher help!
How stiff is the card stock? Some cards cannot feed if the printer rolls the card to print on it. (This one does) I
have taped cards to a full size sheet of paper and run that through. Usually this means the paper is too stiff. You can try cleaning the paper feedroller with a rag with a bit of windex on it. (This roller is above the paper tray where the paper loads in.)
there are some broken parts on your printer it could be at the lower back portion of the carriage which holds or take control of the mechanical parts not to feed paper when initializing or it could be its counter part that is broken that could be found on the right side of the printer almost on top of the small gear of the output paper roller.
1. Is that you've enabled the second tray for the printer. This is normally automatic but to check go to: START > Printers > L7780 > Properties - Click the "Device Settings" tab ... then sort out the different setting so they are all correct such as paper size and of course "Tray 2: Installed"
2. The other more common issue is simply that the printer isn't sitting properly on top of Tray 2 and as a result it's not engaging the cog wheel properly to pick up paper.
This is one of those trial and error things where you pick up the printer and re-slot it down onto Tray 2 until it works properly.