Question about Dell 5100cn Laser Printer

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Dell 5100cn - Magenta color on all prints

I have thus far replaced the imaging drum and transfer roller in my Dell 5100CN (which has just went out of warranty). I have also replaced the Magenta toner. I am still getting Magenta color on all prints which have any color text. Basically the pages come our pink. I have tried cleaning the magenta developer through the maintenance menu with little success.

I have contacted Dell and they tell me the problem is probably not the fuser, but the internal developer. They then go on to say it will be cheaper to replace the printer than to replace the developer.

I hate to throw away a printer that is less than 3 years old. Any suggestions?

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  • 6 more comments 
  • 56tbird Nov 04, 2008

    Cory thanks so much for your reply.

    I found the part for best price of $150 + ship. I am pretty good at following instructions and have basic mechanical skills. I would appreciate those instructions you mentioned.



  • douglasdg Dec 08, 2008

    I need to replace the Yellow developer. I have yellow toner all over everywhere.

  • Anonymous Dec 10, 2008

    Magenta developer asembely needs to be replaced and I need the instructions

  • Ryan Dec 17, 2008

    I am having the same situation with the magenta toner all over any color printouts. I ran the developer cleaning through the menu and it seemed to fix it for a couple of printouts, but then it got progressively worse and is now back to almost just pink pages. can you send me those instructions you sent "tbird"? Thanks.

  • mellowingrey Dec 19, 2008

    Magenta Developer...I am having the same problem with smearing; complete pink pages while text output is correct.

    Cory, I've checked the web and the Magenta Developer M6090 seems readily available.

    You mentioned that you had instructions to replacing the developer. Can you make them available?

    Thanks for your insights.........JimK

  • Robert_Lef Dec 29, 2008

    I'm having the same problem with cyan. I just replaced the drum a month ago. I'm seeing that my pages are all coming out with large amounts of cyan on them. Those page that have cyan text on them suffer from having that text repeated on the page at various intervals. Those pages that are just black and white have cyan haze across the page. What is the part number for the cyan developer?

  • ruth_racher
    ruth_racher Feb 18, 2013

    Hi Cory, I may need to do the same thing. Can you also direct me to some instructions

  • Larry Townsend Jun 22, 2013

    Hi Cory - I already have the part. Can you send me the instructions too? Thank you.



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Hi 56tbird.

The answer you got from Dell was partially correct.

It is the Magenta Developer that is causing your problem, however, you can replace this part for less then the printer if you do the work yourself.

I have successfully instructed other on replacing the developer units, although you will have to procure the part.

This is one of the 4 color assemblies you see when you remove the imaging drum.

The part number for the Magenta Developer is M6090

The first thing to do is price the part. I usually suggest doing a google search for the part number. you will find many resellers that way.

you might also try a search on Ebay for the part number as well.

If you decide to purchase the part, if you somewhat mechanically inclined, you should be able to replace the part without a problem.

I can give you detailed instructions on how to change the developer if you decide to go that route.



Posted on Nov 04, 2008

  • 4 more comments 
  • Cory Friedman
    Cory Friedman Nov 05, 2008

    Hi 56tbird,

    I am not sure why, but I just spent an hour working up the detailed instructions with photos, and when I went to post it, it did not post.

    If you send me your email address i will just send you a pdf file with the instructions.



  • infinikay Aug 25, 2010

    Cory, I'm suffering from the same issues on my Dell Color Laser 5100cn. Pink is spread throughought the entire page and I have to replace the developer unit. Can you please send me the pdf file instructions to replace the developer unit? my email is Thanks so much!

  • markjlim Jan 05, 2011

    Hey infinikay, did you get these instructions? if so, can you email them to me as well? Stupid printer is bleeding magenta! Argh!

  • kip643 Jan 07, 2011

    Hello 56tbird. Would you mind send the instructions to me?

  • accurateps Jun 01, 2011

    Cory, This pretty old but I just recently ran into this problem. Can you send those instructions to me as well? I appreciate it.


  • Larry Townsend Jun 22, 2013

    Hi Cory - I have the parts. Can you send me the instructions also? Thank you.



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Deteriorating image quality

Good Evening Robert,

The setting for non dell toner only controls the fuser temperature, and will not cause you any print quality issues. Toner is actually made up of ink and plastic. The fuser melts the plastic to "fuse" the image to the paper. Dell toner is set to "fuse" at a specific temperature. when you use non Dell toners, the temperature required to fuse may be different, and when set to non dell toner setting, the fuser temperature is raised to the maximum to ensure the other toner fuses properly. The down side to this is that you will wear out the fuser sooner then it should.

As far as the print quality issue you are having, it is most likey caused by the imaging drum.

Regardless of the estimated life for the imaging drum as stated by the printer, this is just an estimate. Many things can and will cause the imaging drum need replacing. ( Just yesterday I replaced a black toner in a 3115 that was less then a month old... genuine Dell... with more then 75% expected usage left because it was defective).

On this printer, each of the 3 colors and the black are all independent of each other with the exception of the imaging drum. Even within the imaging drum, cyan and black are independent of magenta and yellow on the first stage of transfer. When you have deteriorated print quality that effects more then one color, the first step is to replace the imaging drum.

The Primary transfer, secondary transfer, and tertiary transfer of the image are ALL contained within the imaging drum.

The chances of having 3 or 4 bad Developers is very very slim. If your print quality issue was related to only ONE color, then I would say you had a bad developer unit ( the 4 items located behind the imaging drum when removed). These are far more difficult and expensive to change.

The BTR ( bios transfer roller ) is the only other item that "could" effect your print quality, however, based on the symptoms you discribed, I doubt it. Besides, if i am not mistaken, the imaging drum kit comes with a new btr anyway.

Although I am sure you may be disappointed with the fact the drum unit is failing while showing it still has life remaining, the solution to replace it should restore your unit to full operation. The unit is light sensative, and effected by physical age as well as the number of prints it has supplied.

Please evaluate the solution i have provided and, rate the solution appropriately to show your support.


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I am going to answer this even though there was no reply to my clarification report.

No, it is not a HVPS problem. This is a magenta developer problem. The magenta developer for some reason has the highest failure rate of all the developers, including black. Perhaps because there are more shades of magenta in color prints.

Since you changed the toner, we can assume you are not out of magenta, but it is possible that you did not run a developer cleaning in the maintenance mode on the magenta developer.

If the magenta toner had been allowed to run out all of the way, a developer cleaning would allow the toner auger to move fresh toner from the toner dispenser, through the feed tube, into the developer.

If you have run the developer cleaning, and you can see that there is magena toner on the magenta developer ( for clarification, the developers are located behind the imaging drum. remove the drum to expose the 4 developers ), then the developer itself is defective.

Good luck.


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