HP Photosmart C6280
I looked in the back of the printer, and it appears the gear on the metal feed bar that is exposed is split. Trying to find out how easy it is to repair this.

Experienced technical support provide their insights in answering this question :
You can quit wondering. Parts are unavailable. I’ve seen posts where people have 3D printed the parts or machined them out of metal.

How to Identify and Fix Common printer Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

Sometimes a paper jam error persists even though there is no jammed paper (false paper jam). Reset the printer, which might clear a false paper jam error, and then try to print again. With the printer turned on, disconnect the power cord from the printer. Unplug the power cord from the power source.
Damaged or dirty paper rollers. Torn, wrinkled, or damp paper loaded in the paper tray. The rear access door or two-sided printing accessory (duplexer) might not be closed or is not locked into place. Paper was added to a stack already in the tray while the HP product was printing.
If the paper is even slightly askew, the rollers will pick it up a little crooked, and — guess what — the crooked sheet will immediately get jammed. So even though there`s no paper stuck when you start printing, the loose paper guides are ensuring that a sheet gets jammed whenever the printer starts doing its thing.
your pickup roller is dirty and the printer can`t grab a piece of paper. it will say paper jam when it does this. get a drop of dishsoap and clean the pickup roller of your printer with this. scrape at it with your fingernail to get the roller clean and wipe it off with a damp washcloth.
Do a hard reset on your printer. To do this you just need to turn off your printer, unplug for a few minutes and then plug the printer again. If that still doesn`t work, try turning the printer and your computer off, and then start it back up again. Try uninstalling and then reinstalling your printer driver.
Low-quality paper leaves an accumulation of tiny paper bits often referred to as “paper dust” inside the machine. This “dust” is one of the top causes of paper jams. More dust means more jams. Besides jams, the dust also contributes to poor-quality prints and causes machine parts to wear at a faster rate.
The message Paper Jam may appear on the display if the Brother machine is not feeding paper correctly, paper scraps have become stuck in the print head path, the paper is not loaded properly in the paper tray, the jam clear cover located in the back of the machine, is not installed properly or the PE Actuator is …
If your PC or the LCD screen on your printer is telling you that your ink cartridges are full but no ink is passing through to the paper, then it`s most likely that you are dealing with a clogged printhead. Blurry documents and images that appear faded are also signs that it`s time to remove the excess ink.
Dust, paper fiber, and other debris might accumulate on the paper feed rollers and cause paper jams and paper feed issues. Clean the rollers inside the printer, and then try to print again.
With the printer turned on, disconnect the power cord from the rear of the printer and also unplug the power cord from the wall outlet. Remove USB cable, if present. Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge.
Contrary to its name, there is nothing supernatural or spooky about a ghost jam. Instead, ghost jamming refers to an issue whereby the copier reports a paper jam even though there is no paper being physically jammed within the copier. Such an occurrence is also known as a fake jam or a false jam.
Did you know most copier paper jams are caused by the paper itself? Misaligned paper. When a stack of paper isn`t aligned properly in the machine, it often causes a paper jam issue. When adding a ream of paper, always fan the paper, load carefully and avoid overstuffing the tray.
The Cache Manager stores the cache files, by default, in c:\program files\printer properties pro\printer installer client\cache.
Among the more common technical issues that may bring down a printer are disconnected cables, malfunctioning routers, and low ink levels. Moreover, software problems such as interrupted connections or incorrect settings in your system`s drivers can also cause your printer to show up as offline.
The paper might not be engaged with the feed rollers. The paper-width guide is pressed against the paper stack too tightly. The paper tray is not completely inserted into the product. The paper settings in the print driver do not match the paper loaded in the paper tray.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

My printer feeds through one piece of paper all the way and then a half piece of paper and stops. I pull out the paper to stop the paper jam and then it prints but sounds rough. After printing, it doesn't feed the paper all the way through.
ANSWER : And the first 2 sheets, the full and half sheet that go through first, are blank.

Read Full Q/A … :

HP Photosmart C6280

Keep getting a paper jam message. There is no jam.
ANSWER : You can quit wondering. Parts are unavailable. I’ve seen posts where people have 3D printed the parts or machined them out of metal.

Read Full Q/A … :

HP Photosmart C6280

Canon mx410 Paper jam message, but no paper jam?!
ANSWER : I have exactly the same problem, no answers 😳

Read Full Q/A … :

HP Photosmart C6280

hp 8600 pro when power on, paper jam message appear but there is no paper jam in the tray
ANSWER : Hp 8180 Photosmart All In One code keeps says paper jam and carriage jam when neither are jammed. I followed all the recommended things to do. I live in Raleigh NC any place to take this or any suggestion.

Read Full Q/A … :

HP Photosmart C6280

Paper Jam error but no paper jam
ANSWER : Obviously you didn’t get all the paper cleared out. There is a small scrap in the paper path causing the jam when the paper hits it. You can try clearing it out by inserting something stiff like a piece of file folder from the back of the printer into the paper path and pushing the offending piece out that way.

Read Full Q/A … :

HP Photosmart C6280

Paper Jam and carriage jam code when nothing is jammed
ANSWER : Did you try cleaning the encoder strip that runs through the cartridge assy.? Use Window Cleaner on a paper towel. Also, check inside on the right. I’ve seen a lot of times where there is a folded up scrap of paper that stops the carriage from going all the way to the right.

Read Full Q/A … :

HP Photosmart C6280

message error: ADF paper jam
ANSWER : There is a thin plastic arm that the paper pushes on. It is spring loaded. If it doesn’t return and unblock the sensor after the paper passes it, you get the paper jam warning. I’m guessing that is the spring you are referring to.

Read Full Q/A … :

HP Photosmart C6280

Paper Jam Messages
ANSWER : You would need to replace the pickup roller. It’s not too difficult to do. http://www.precisionroller.com/paper-feed-components-for-hp-laserjet-2430/details_36378.html

Read Full Q/A … :

HP Photosmart C6280