Why do I keep getting error message (Code 3524)

Wow! There was a guy who had a video on YouTube, with about a half hour of instruction on how to take the machine apart to get to the area that you mentioned, but after I gave up on him (didn't have that much time or ambition), I found your answer here, and I grabbed a screwdriver. After lighting up the area with my cell phone, I found a gear that looked like it hadn't been moving, and I forced it to move, then moved another gear, just to be safe, closed up the machine -- and it was cleared of all error messages. I am SO excited! Thank you so much!

OMG! This is one of those "little problem, little hammer" solutions, but it worked. I messed with the gear near the sponge on the far left side. Had to do it twice, but it worked. I then ran clean print head, calibrate and the like and it's good as new. All gunked up inside, so I might attempt to clean all of the crap out over the weekend, but at least I'm getting work done. Funny but amazing.

"This works! I’d advise have a rag to gently wipe any excess ink seen behind the cartridges and also remove any built up ink or paper dust on the adjacent areas of the inky flap. Very simple.

Thank you for the easy post."

Worked for me too. Used a tooth brush with alcohol and then some compressed air. Did it outside wearing an old shirt but it wasn’t all that messy anyway

So far tried everything on this page. Can’t get the small gear to move. My hand are black from the ink. Seems like the black was just running out of the cartridge. Was always out of black now I know why. Probably be buying a new printer, this one isn’t that old but never really liked it.