Question about HP LaserJet 2840 Printer

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Half the page fades to white

Apparently my carousel central axel has twisted. What is the proceedure to repair this?

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  • Anonymous Mar 28, 2008

    exact same problem. seems to be common with this printer.

  • Maria Garcia Apr 09, 2008

    CYAN TONER IS STREAKING MY COPIES,

  • jcar44 Apr 16, 2008

    same problem
    john@carnahanelectric.com

  • Hortense Apr 26, 2008

    How do you do this (disassemble the printer remove and re-align the carousel)? Are there step by step instructions for a novice? Thanks!
    Dan


  • nashjohnson Jun 05, 2008

    my printer only prints on the side of the pages

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  • 14 Answers

The printer has to be almost completely disassembled, carousel removed and re-aligned. This solves about 90% of time.

Posted on Apr 11, 2008

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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 http://www.partshere.com/Models/Q3948A/CLJ_2820_Removal_replacement.pdf
look at figure 5-78 Removing the print-cartridge carousel you will see the white gears im talking about

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The color is faded on the left side of the page printer, what is the possible cause or solution?


From the service manual:

If the light printing is on the left side of the page, the carousel might be dislocated.

Solution: Verify that the print-cartridge carousel drive teeth are aligned correctly. If the teeth are aligned correctly, replace the print-cartridge carousel.

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Dislocated carousel


Here a short run down on it:

Common on this type print engine. Your carousel is out of index. Repair requires removing all toner cartridges and printer covers. Big black carousel gears have index marks, one on each side. Trip the solenoid carousel brake at the top left of the rotary drive assembly by lifting the solenoid flap to free manual carousel rotation. Bring the yellow slot to the front, facing you to achieve rough indexing. Look for the two white pins of the white carousel drive gear, one pair on each side. Rotate the carousel to where the two pins, which face inward, are at the bottom. The mark of the carousel gear should be between the two white pins. Chances are it is a tooth or two out of index on one side. To reindex, push the black carousel gear inward and the white drive gear outward to skip a tooth. Recheck, reassembly, and have fun.

Hope that helps you.

Aug 27, 2008 | HP LaserJet 2550L Printer

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try to recalibrate the cartridge carousel. the central axel is twisted. there are more than 2 problems like this arownd...

Feb 27, 2008 | HP LaserJet 2840 Printer

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Printer only prints partial page


hmmm...did you get new printer drivers when you re serviced machine..

www.hp.com


sort of like changing the fluids after an engine job

check your computer warranty here 4 FREE

Feb 27, 2008 | HP LaserJet 2840 Printer

1 Answer

HP 2840


the carousel gears are out of sync - "off a tooth" and have to be realigned.  i spent 3 days last week fixing this problem - it's quite a job, to say the least.  my question - if you ever check for this answer - is: what were the circumstances when the problem first occurred?  just after replacing a toner cartridge?  if so, was it recycled cartridge?

Sep 06, 2007 | HP LaserJet 2840 Printer

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