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The problem you are experiencing is a common problem with this printer. What happens is over time as the printer is used, toner or developer builds up a film on the developer blades. The developer blades meter the amount of toner that the printer puts on the paper to make the image. As the film builds up, less and less toner makes it to the page causing the image to become faint. The black developer blade probally is clogged.
This can be fixed two ways. The easiest and most expensive is to buy a new imaging unit for about $100+. The second is to disassemble your imaging unit and clean the developer blade(s). This can be done in about 30 minutes. I have posted instructions in my Tips section.
No oil on rubber rollers! You must gently clean the rubber roller with isopropyl alcohol and a soft cloth. Let it dry and it should work again. Make sure to get ALL of the oil off of the paper paths surfaces.
You're on the right track! If you remove the paper tray and put the printer in a position so the front of it is facing up, you can then access the roller shaft with ease. If you now look on the right hand side of the roller shaft you will see a white plastic end which is secured onto the shaft with a little clip, lift this up and slide the plastic part inwards. This should now make the shaft easy to turn so you can release the two white clips on the roller and remove the rubber band (which there is only one of, but looks like two on a first glance). Once removed, I just turned it inside out so you can get another few months or more out of it before you have to buy a brand new one for a couple of ££. Replacement is just the reverse of removal. Hope this help!
mine is the same way, to solve this I elevated the bottum by 2 inches, then i kept it off, also i blow a fan on it while running.
also, you need to clean the filter (the gray "L" inside) black dust should come out.
lastly, mine actually broke because it overheated.
The rubber band goes around the plastic roller and is loose about loose enough to get a finger between it and plastic however the thing then pushes back into the curved space at the back of the roller so it forms a kind of c shape around the roller. If that makes any sense!
I have just SOLVED my CLP 300 printer paper jams by replacing the rubber band on the paper pick up roller. My old rubbber had worn flat and had dried out. I was lucky as Samsung had sent me one for an engineer to fit. However, being an engineer myself, I replaced it with instant success!
You could fix yours without replacing the band because all it needs is to be turned around to a non worn area. To get to it safely, unplug your printer from the mains supply and the USB cable. Remove the paper tray.
Open the front door and remove the imaging unit complete with toners. Now turn your Printer upside down and look for the rotating bar with a centre wheel and rubber band. The rubber band looks like it only goes half way around the wheel. This band is Clipped onto the wheel. With careful prising, you can unclip the rubber band. It's a bit tricky and tight but I have done it no probs. Perhaps being a techy myself has helped? Anyway, rotate the band around so that a fresh bit of rubber will be acting on the paper and refit. This is also tight and tricky, but can be done without dismantling the printer to replace the who bar.
The actual part that is unserviceable is the rubber on the Samsung MEA unit pick up roller. The part number is JC97-02647A
Now refit all the other stuff and test your printer. I have also got rid of the dreaded clicking too! But that's another story.