Question about HP LaserJet 2840 All-In-One Printer

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Printing on right side only

I installed remanufactured yellow, magenta and cyan cartridges at the same time. Although I was printing black text just fine before the change, afterwards all four colors are printing on the right side only...fading from normal print on the extreme right to faint print in the middle and to nothing at all left of center. I have seen this problem described elsewhere and a discussion of a possible carousel misalignment. I am doubtful this is my problem, however, because the right color cartridge is showing when I open the panel after I press the cartridge rotation button. Can this nevertheless be a carousel alignment problem even anyway? And if it isn't a carousel alignment problem, what else could it possibly be? I have a service manual and the mechanical know-how to take it apart, if necessary, but that will be a last resort.....

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  • LouisianaJan Mar 23, 2008

    My printer is only printing on the right side of the page with the old and now the replacement of all colors. I read somewhere that the axel needs to be realigned. Can anyone offer instructions on how to do so? Thanks so much

  • robertinski Mar 24, 2008

    Thanks, smuteanua, your diagnosis was right on. The carousel
    gears were misaligned on the right side by a mere single gear tooth! I found a
    copy of a couple of pages form a field service manual online which described
    the repair. I was able to accomplish the repair without removing any of the
    printer covers thankfully. Here's what I did.



    First, I used a large straightened paper clip and inserted it to release the
    carousel brake/clutch. Open the toner cartridge cover and look for a small
    square opening/hole on the top right side. You will see a small white plastic
    part inside the opening, and it also has an opening it it – that’s where the
    thin screwdriver or long paper clip should be inserted to release the
    brake/clutch. Now the carousel should turn freely. This will enable you to
    align the gears.





    You are looking for a large black gear on opposite ends of
    the carousel (which is actually more like a ferris wheel). The large black
    gears are marked with letter codes each color of the four toner cartridges: K
    for black, M for magenta, Y for yellow, and C for cyan. A small ½ to ¾ inch
    diameter white gear sits atop each of the black gears. Two small pins protrude
    from the small white gears. Turn the gears until you spot those pins. Those
    pins must align with a mark on the large black gear. The “mark” on the large
    gear is actually more of a slot, notch or groove, and there are more than just
    one of these markings on the large gears so you have to find the right one. The
    single mark on the larger gear is adjacent to the slot for the black cartridge,
    marked with a “K.” See the illustration below.








    The field guide describes the repair like this: “To re-index
    the carousel, grasp the black carousel gear and pull the gear inward while
    pushing outward on the white gear. When the gears separate enough to skip
    teeth, rotate the white gear around in the proper direction to correctly index
    the carousel.” While the field guide contemplates removal of printer covers and
    full exposure of the gear system, I was able to accomplish the repair without
    going through all of that. I gently pulled the larger gear inward enough so
    that the gear teeth disengaged, allowing me to realign them by one tooth. If
    you scour the internet, you can find a pdf of HP’s service manual but it was
    not of much use to me for this particular repair. The couple of pages I found
    of a repair field guide were what described and illustrated the repair for me
    (although it was not of the 2840 but close enough). I will share either or both
    the manual and field guide with anyone who requests them and provides me with
    an email address to which to send them. Good luck to you!

  • JDuChemin Sep 29, 2008

    So I have taken out the toner and drum several times and recorrected the allignment of the carousel. Everytime I put them all back in the gear skips over one notch and it goes back to printing on the right side only. Any one know why this might be happening? Am I causing this or is something wrong with the printer gears? This is freaking annoying........................

  • fredavide Nov 13, 2008

    Everytime I fix the alignment. It skips a tooth and I have the same problem once again. This solution is not working for me.

  • JDuChemin Jan 28, 2009

    I have 2 HP 2840's with the exact same problem. On both I have tried to re-align the gears like described abouve but neither of them will stay that way. I am going to have to try and clean them like described above...I will keep yall posted.

  • JDuChemin Jan 30, 2009

    So Junkerette did cleaning off the gears work for you as a permanant fix? I am going to try to do that with both my printers tonight to see what happens!?!?! Goodness I hope it works........

  • felicia897 Feb 25, 2009

    only printing on the left side and is actually getting worse when printing test pages. Looks like it will eventually stop printing anything if I keep testing it.



    It sounds like I need to align my cariusel....



    Anyone have directions to do this?????

  • Anonymous Mar 17, 2009

    sounds just like whats going on here - remanufactured yellow cartridge & out of whack carousel = woud ypu mind emailing the pages you found hel[ful to danlight1@msn.com [;ease? Thank you! Dan

  • i22yb May 11, 2010

    In response to ChadFromOC, your theory about remanufactured cartridges and leaked toner causing this problem may be applicable in some cases; however, my problem occurred immediately after a paper jam.

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Ok, for those who are having troubles releasing the clutch.
when i fixed my printer, i didnt even know there was such a release.

i fixed it in an other way (not for the faint hearted)
open the printer, remove all cartridges and photoconducter unit.

when misalligned, you will notice the guides where the toner cartiridges slide into place, left and right, are shifted.
the part of the printer body guides misalign with the carousel guides.

basically, what you need is a big screwdriver.
push the big screwdriver on the right side between the carousel and the body.
the black plastic ferriswheel will bend inwards, enough to go free from the little white driving gear wheel.
now move the right ferris wheel 1 notch into position.
ready. reinstall toners etc.

be carefull not to break it.
it does work, done it on 3 machines now.

the only reason why this happens which i could find,
is that there was a toner cartridge that is stuck.
feel if you can rotate the white cartridge gear by hand.
if not, that is your problem.

possible lesson:
do not over fill your cartridge.
it is perfectly possible to refill, done that many times with these machines, but dont overfill.
ot maybe it is moist in the toner or something.
these cartridges dont have eternal life

good luck, dj

Posted on Jun 01, 2009

  • haris May 16, 2012

    can u show me the picture or video please??

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THANK YOU, THANK YOU, THANK YOU!!! This worked amazingly well and only took about 30 min.

Posted on Jul 16, 2008

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UNBELIEVABLE.....THIS WORKED PERFECTLY!!

Posted on Apr 28, 2008

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Hey there. I am a Custormer Support Engineer.
In about 99% of these problems, the solution is to reposition the carousel to the right position. If you whant to verify that this is really you problem, stick a thin screwdriver into the carousel clutch - top/right under the cartridge cover to manualy rotate the carousel. When a developing roller is in the closest position to the Drum look from the top straight down and you can see that the distance betwen left and right is different.

Posted on Mar 18, 2008

  • lalloon Jun 01, 2011

    Thank you robertinski for a pix that you posted, Printer works fine now, It was the magneta toner that was causing it to go out of alignment.

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Great post! I instead used a metal rod and stuck the tip behind the carousel near the white gear and leveraged out the carousel just enough to move it back into place an wa lah!

Posted on Apr 20, 2010

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Hi!

I have repeted the step about 10-20 times but i can't get the white gear to rotate only one notch.
I have taken the screwdriver in the hole (top, right) and released the white thing but no different.
I have spent days on this problem and i want it solved now because i don't want to waste my days on printer problem ..
What have i done wrong?

I keep getting print on only laft page.

emil if neseccry: maxx_413@hotmail.com

Posted on Jul 28, 2009

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Hi!

I have repeted the steps my the whole day but i keep getting print on only right side, and i can't get my white wheel to rotate ..
I can only get my white wheel to spin one notch not rotate :(

What have i done wrong?, im tierd of this have spent days on this problem!!, i went it solved now.


Posted on Jul 28, 2009

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I had the same problem. Fantastic, easy to do solution! I would, however, recommend that after you vacuum the toner, that you use a soft toothbrush to remove remaining toner from the black gears, on each side of the carousel, and follow-up with a q-tip dipped in alcohol for stubborn toner residue. I wanted to get it done right the 1st time so I could get back to work. Also, to re-index the the carousel, it was easier to grab the black carousel "at the top - using a tilting motion", pulling inwards. I tried to pull straight out & struggled with it. Thanks for the great advice!

Posted on Jan 28, 2009

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I had trouble releasing the break/clutch. I was able to find the small white plastic part inside the square opening, but didn't really see the second opening on the white plastic part. Inserting a paper clip into this second opening is what releases the break/clutch.

So looking down on the printer, find the white plastic piece as described above. The second opening on the white plastic piece looks like a tiny square black hole at the bottom of it. Again, that is where the paper clip is inserted.

I was in the correct place the first few times I tried, but I used a small screw driver that was not small enough, so it wasn't fitting into the tiny square black hole. I found that as instructed in the original reply, a paper clip worked perfect. I guess I thought it too small and flexible so I went with the screw driver... that was a mistake.

Posted on Dec 10, 2008

Hello:

You are a genius,
I played with this for three days.

After I read your instructions, it only took 3 minutes

Thanks.

Jfernandez

Posted on Aug 13, 2008

  • DoctorXX Feb 10, 2011

    I dont see how you people are able to get to the white gear. I can hardly see it let alone moving it in the right position. Also, when the gears are aligned, is the area when the cartridge goes in supposed to be aligned so you can just slide one in?

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Thank you robertinski. You description was excellent. I had a copy of the service manual and was about spend a few hours tearing into the printer, taking off panels and parts to get to the gears, and you made it extremely simple to get to the gears. And thanks to smunteanu, you were also correct in double-checking the existence of the problem using the spacing of the roller. A few things I'd like to add:

  • After releasing the carousel brake/clutch, you need to remove the toner cartridges so you can see the notch on the carousel. Plus it is a lot easier to work with. I also removed the drum (right in front of the unit). That gives you a big cavity to be able to stick in hands, flashlight, and even your head.
  • First look for the pins on the white gear and notch on the carousel of the LEFT side. I found the left side much easier to see. Then once you know what you're looking for, find the one on the right. I found the two pins on the right white gear harder to see. I marked the two pins with a sharpie marker.
  • Like many have reported, mine was off by just one gear notch (right gear for left side of the page printing blank).
  • After you pull gears apart as described, and rotate the white gear in line with the notch, you might find that the gear do not want to go back together. This time, push down gently on the carousel (black gear), so it will allow the gears to be realigned vertically and pop back in.
  • I suggest if you have toner spill all inside your printer, you also take the time to use your vacuum attachment to get in there and gently remove the excess toner while all of the cartridges are out.
  • After putting all cartridges back in, and you are ready to pull your screwdriver (or paperclip in my case), you need to first spin the carousel back into position. If you do not get the carousel aligned, the printer will probably not align it properly when you turn it back on and you will get an error 54.2 (carousel rotation error) when you try to print a page. After you reengage the clutch, move the carousel to make sure it is locked in place. I found mine spun off alignment and locked in the wrong position, I tried the paperclip release and rotate a few times 9trying different cartridges, until it stayed locked (black cartridge in my case).
I have a theory on why this has happens (specifically). Like my own case, I have seen many incidents of people referring to remanufactured cartridge use and later getting this error. So there is reference to this being the case, but I think it is the specific cause in that: The leaked toner ends up on the gears, and eventually thicken enough to fill up a gear tooth enough to allow a skip.

Posted on Jul 04, 2008

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Hello, i have this hp laserjet 2840 all in one printer it's working fine but when i give 10 to 12 print it will show tray1 is empty what i do for this problem it u have a solution please give me reply as soon as possible ok bye.

Posted on Apr 05, 2008

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SOURCE: Printing on right side only

It is the carousel that is dislocated. Check the alignment if it's brooken

Posted on Nov 03, 2008

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