Question about Samsung CLP-550N Laser Printer

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"Invalid Imaging Unit" after replacing toner cartridge

Hello there. I have a problem I hope to find a solution to. My 2 year old Samsung CLP-550N Laser Printer displays "Invalid Imaging Unit" when replacing a toner cartridge. I’ve been using the starter cartridges that came with the printer since the beginning. I don’t print very much so it has lasted me this long. So I bought $450 in replacement cartridges at Best Buy and proceeded to replace them. I replaced all the cartridges at once, turned the printer back on and received an “Invalid Imaging Unit” error. I turned the printer off, returned the old cartridges, turned the printer back on and it started without error. I then tried replacing the cartridges one at a time. I found that after putting in the new BLUE cartridge and turning the printer back on; it throws the error. All other cartridges went in fine. I now have all but the blue cartridge replaced and would like to get my new blue cartridge in there but the printer won’t accept it without returning the “invalid Imaging Unit” error. I tried researching the problem on the web myself and found a bunch of other people with the same problem. One person stated that they were told to enter a series of button commands to reset the country code for the printer and consumables (…?) and this worked. Still others reported that they had to call a service tech out multiple times before the problem was eventually fixed. I don't know, but since my printer is 2 years old, I know Samsung will want to hit me up for repair charges. It’s sad that people aren’t going to find out that their printer has such this flaw till its warranty is expired. While I fully intend to attempt returning the failing cartridge to Best Buy for another, I doubt they will accept it since it has been opened. What can I do and how can you help me fix this error myself?

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  • Doug Pierce
    Doug Pierce Jan 19, 2009

    The printer is off 90% of the time and has hardly any use. I reject your reasoning.



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  • 41 Answers

After 2 years ,surly it need to change some part because of life time of some part that is very tired ,try to show it or take it to samsung service center in your country ,...

Posted on Jan 19, 2009


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Posted on Jan 02, 2017

  • 128 Answers

SOURCE: Samsung CLP 550N paper jams

Your printer accepts a variety of print materials, such as cut- sheet paper (including up to 100% recycled fiber content paper), envelopes, labels, transparencies and custom-size paper. Properties, such as weight, composition, grain and moisture content, are important factors affecting the printer?s performance and the output quality. Paper that does not meet the guidelines outlined may cause paper to get jam.

Posted on Jan 19, 2006

  • 161 Answers

SOURCE: Samsung CLP-550N

Your printer has an inner setting within the menu that tells it not to pay attention to the computer's commands. The CD that came with the printer contains the users manuals. However, this is not the default setting, so maybe someone pressed the wrong buttons in the right sequence.

Posted on Sep 21, 2007

  • 2785 Answers

SOURCE: Samsung CLP-550N. When printing, a

your printer needs servicing.plz show it to a qualified person

Posted on Apr 02, 2008

SOURCE: CLP-550N problem with MacOS 10.4.7

Don't know if this would work:


"I have one and have just finished preliminary testing. I have a CLP-550N and use the network port to connect the printer to our wired network. Using Bonjour (a.k.a. Rendezvous) does not work. I can successfully setup the printer, but it will not print. LPD, however, does work fine. You may need to reinstall the PPD files from the CD, or download them from there (sic) website." Brad Scheider reports: "Samsung no longer supports a CLP-500 driver. But I've found that the CLP-510 Driver works in Tiger and fixes many problems I had with the CLP-500 driver on Panther. Works great now."

Posted on May 27, 2008

  • 1 Answer

SOURCE: My Samsung CLP-550N will not print it's screen

Load paper from the manual feed at the left side. You need to open the lid first.

Posted on Nov 13, 2010

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I had this problem with my CLP-550, which is now 5 years old and is still on the starter toner cartridges. I found a solution at the following URL, where I at least found a picture of the imaging unit:
It must have been a contact problem on my imaging unit, because all I did was remove the unit and put it back.
You need to open the toner casing and the duplex unit. Then open the top housing, exposing the imaging unit. Open the plastic retaining levers at front and back of the imaging unit, and just lift it out (not too far), and then put it back.
I then closed the whole thing and it again worked perfectly.
Hope this helps someone.

Jan 10, 2008 | Samsung CLP-550N Laser Printer

1 Answer

Toner and Imaging Unit issues

If this IS a CLP-510, first make an information confirmation print.
Press MENU, then press ENTER, and ENTER again.

Look at the counter for the imaging unit, is it a low count confirming that you have indeed replaced it ?
If not you will need to reset the counter.

Check the counters for the toner cartridges, and check the capacity of the cartridge. On a CLP-510 the image counter for the toner is held on the chip on the cartridge (which also identifies the capacity of the cartridge).

There have been some faulty (oiginal Samsung chips), and of course re-manufactured cartridge chips could fail (many re-manufacturers don' test their cartridges before dispatch, they don't have the facility to do so without starting the count on the chip (or 'bowing' the reset fuse on a CLP-500 cartridge). VERY few re-manufacturers can test these cartridges without starting the count.

Sometimes the 'replace xxxxx toner' messages are caused by toner on the three contacts on the side of the cartridge, or their mating contacts inside the printer. Rarely, this can be caused by a faulty circuit board.

Dec 20, 2007 | Samsung CLP-510 Laser Printer

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