Question about HP LaserJet 2840 Printer

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Service manual Hi .I need a service manual from Hp 2840. Thank you very much for your ansewer.

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Full service manual:,%202830,%202840%20Parts,%20Service%20Manual.pdf

Posted on Jan 14, 2010

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I have a copy of Chapter 5 relating to the carousel, that's all I could find online last time I looked. Reply with an email address if you want a copy.

Posted on Dec 19, 2008

  • i22yb Dec 20, 2008

    After doing another quick Google search I found this link for you:



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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
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click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

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Hp color laser jet 2840 not printing on left side

Other than tec guy are not advisable to do this exercise :Corosol align disturbed,open the printer up to corosol mechanism check rotary swing shaft left and right gears, there are markings which was exactly matching with rotary right & left disc markings. If its disturbed print quality issue will developed. If you have service manual read carefully before opening the printer.. Best of luck.

Oct 17, 2011 | HP LaserJet 2840 Printer

1 Answer

MY HP 2840 IS ONLY PRINTING ON THR RIGHT SIDE, What could be the problem?

this is a typical problem.. this printer uses a carasol meaning that the toners are riding on a carasol there are 2 white gears that drive the carasol 1 on the right and one on the left. Half page fade is almost always a misaligned carousel! A Tech is needed or a service manual here is a link for the manual
look at figure 5-78 Removing the print-cartridge carousel you will see the white gears im talking about

Mar 31, 2010 | HP LaserJet 2840 All-In-One Printer

1 Answer

I am getting a prompt that says " 50.2 Fuser Error. Turn off then on." That hasn't helped. What's my next move?

Your problem is in the fuser. 50.2 means the fuser is not reaching temerature properly in the allotted time. It either has a burned out ceramic heating element or thermistor (hi/low thermometer).

Here's a link to a free service manual that will walk you through testing it.,%202830,%202840%20Parts,%20Service%20Manual.pdf

Sep 28, 2009 | HP LaserJet 2840 Printer

2 Answers

54.2 ERROR


According to manual it means:

"Carousel rotation error: Replace the carousel drive motor or if the problem persists, replace the DC controller. It the error still persists, inspect or replace the engaging detection flag."

I think that you need to take it to service.

Best regards,

Apr 23, 2009 | HP LaserJet 2840 Printer

2 Answers

Hp 2840

The machine is telling you that there is something wrong with one of your toner cartridges. If you recently installed a remanufactured cartidge the builder didn't replace the smartchip on the nose. If your using OEM (HP) orginal cartridges you may have got a power surge that has knocked out the memory on the toner cartridge.

Try to bypass the error. Attempt to print a "Supply Status" page from the printer. It will tell you exactly which one is at fault.

Here's a link for a free service manual for the printer that could also be of some assistance.,%202830,%202840%20Parts,%20Service%20Manual.pdf

Hope that helps you. If so hit me with a FIXYA! Thanks :)

Sep 25, 2008 | HP LaserJet 2820 Printer

1 Answer

HP LaserJet 2840

The error your having caused by the scanner assembly in the Auto Doc Feeder. The part is not real difficult to replace however it is not cheap. Here's the part number: Q3948-60191.

The part is available through HP online at for $130.76 plus shipping. It is also available (probably a little cheaper) from Seattle Platen, Dale - 1-800-221-2388.

We have been sucessful a couple times in disassembling the lower (scanning) section of the Auto Doc Feeder and thoroughly cleaning all mirrors and lenses. It's about 1 in 8 that will clear up the issue. Replacement is 100% cure.

Here's a free copy of the HP 2820/2840 service manual that will help you in the disassembly.,%202830,%202840%20Parts,%20Service%20Manual.pdf

Hope that helps solve your printer issues. :)

Aug 26, 2008 | HP LaserJet 2840 All-In-One Printer

2 Answers

2840 Memory Cards not recognized

Have you got it fixed yet ?

If not, are you quite handy with a Philips screwdriver ?

I have managed to fix mine by looking on the HP service forum under a post called "LJ 2840 seen as LJ 2830". Just g00gle it.

Have added my comments at the end of the post.

Good luck.


Jan 03, 2008 | HP LaserJet 2840 Printer

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