rahdo

asked Jan 28, 2014 at 4:03am
Hp HP Color LaserJet 2840

Is my HP2840 carousel misaligned? (video included)

Hi, our HP2840 recently stopped printing in colour for no describable reason. I confirmed it wasn't the drivers because it also won't photocopy in colour. The process always goes fine, but we end up with a page with nothing on it. All the toner cartridges are full, so there doesn't seem to be any problem there. It warns that our B/W toner is low, but I imagine that's not the problem.

So it seems that the most common explanation for this is that the carousel is out of alignment, so I followed the very useful directions that Moe put out there and checked, but I *think* they're lined up just fine.

I made a quick vid... could someone take a look and confirm? Thanks!

https://www.youtube.com/watch?v=o85yGlXVbJA

If is it correctly aligned, does anyone have any alternative suggestions we can try?
Also, I suppose if it is aligned, this video can be useful for folks who are trying to determine if their own carousel is out of alignment :)
by rahdo on Jan 28, 2014 at 4:07am Add comment
Looks like it is aligned OK. Easy way to check is if the cartridge insertion slots on both sides line up when you rotate it to insert the cartridge.
That being said, the next thing that could cause it would be the carousel brake solenoid. The foam they use to dampen the noise when it engages will deteriorate and the solenoid release plate will stick. This allows the carousel to turn when it's not supposed to and will result in the problems you are experiencing.
Unfortunately, it's quite a bit of disassembly to get down to it to repair the solenoid. You have to remove the top and a bit of the stuff covering the solenoid.
by moe on Jan 28, 2014 at 9:48am Add comment
Oh dear, I was afraid of that. In fact, when I starting looking into the problem, before I knew I could "free spin" the carousel, I was just advancing it step by step, pulling the cartridges out, and putting them back in, and I noticed that when I pulled Yellow out, I couldn't put it back, because the carousel had advanced another half turn, and wouldn't line up anymore.

So it sounds suspiciously like this might be my problem! Aaargh! I guess now I have to figure out what to do to do about this. Are there any guides for this repair online somewhere?

THanks for replying... - rahdo
Time is money, so I don't do it the way the manual says. You do have to take the top off, which is a bit involved. You start with removing the 2 sides. One has 2 screws on the bottom and one side has 1 screw. There are some plastic tabs you have to disengage to remove them, no tools required. Then on the right back, there is a piece of plastic behind the right hinge that needs to come off. It's held in by a couple of plastic tabs you need to unclip and it will slide off the back. Now, you have to unhook the 2 plastic struts at the top under the top assy. Follow the wire bundle and carefully remove the connectors and the flat wires from the track. Be gentle with the flat wires that you don't rip them. Once that is done, you just rock the top back and lift it off and set it aside. You have to remove the 2 front corner pieces. You'll see the screws holding them in and the right one has wiring you need to unplug and a ground wire that slips off its post. Then you remove the top plastic cover. Just look for the 2 screws holding it in and lift off.
Here is where I take the lazy man's route. The solenoid is now visible. I just use a thin blade to reach in and scrape off the gooey part. Then I prepare a piece of thin sticky back felt and lay it face up on the metal plate with some needle nosed pliers. Then I get under the plate and push it up so the felt sticks in place. Other option involves removing a whole lot of stuff so you can get the solenoid out of the printer to work on it. Reassemble and you're done. Just did one yesterday, so it's fresh in my mind. I didn't use the manual, so have no idea what's in it. They slow me down.
by moe on Jan 29, 2014 at 10:06am Add comment