Question about Samsung CLP-550N Laser Printer

2 Answers

Error invalid imaging unit

Posted by on

2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer
Re: error

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.

Posted on Aug 31, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 589 Answers
Re: error

Did you recently change any consumable part (toner, drum, etc)?

Posted on Jan 10, 2008

2 Suggested Answers

SOURCE: Invalid Imaging Unit and Toners

My Samsung CLX3160FN was working flawlessly till a surge hit it. The network connection stopped working. But everything else worked fine, it copied beautifully, faxed great, scanned like a champ, just did not do it over the network any more. Samsung was real fast about sending me a new main board and a technician to my house. Now nothing works. It is giving a red warning and says all the toners and the imaging unit are invalid. The technician couldn't figure out what was wrong. He said he would order me a new printer. I just hope I get a new one and not a refurbished one. Mine worked great and I hate to get a problem unit from someone else. The technician said he believes that the new card has a bios problem in it and was not properly programned for my printer.

Posted on Aug 13, 2008

  • 3 Answers

SOURCE: Clx2160 invalid imaging unit, How do

Try a factory reset by pressing menu->ID Copy->Left->Right->Menu->Black Start consecutively. p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.7px Helvetica}

Posted on Nov 23, 2010

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Invalid imaging unit

there is a chip on the new drum that is bad. you need to return it to whom ever you bought it and they should replace it.

Sep 03, 2014 | Samsung CLX-3175FN Color Laser All-in-One...

1 Answer

Error c2652 in konica minolta c250

C - 2651 Cyan imaging unit EEPROM acces error
C - 2652 Magenta imaging unit EEPROM acces error
C - 2653 Yellow imaging unit EEPROM acces error
C - 2654 Black imaging unit EEPROM acces error.
Clean the connection between the imaging unit and the machine if dirty.Reinstall imaging unit or change imaging unit.
Try reset:
Turn OFF the copier.
Press and keep pressed the Utility key and turn ON the copier.
Keep pressed the Utility key when the Trouble resest message is displayed.
Release the Utility key and touch the message and turn OFF the copier.Wait 1 minutes and turn ON.

Apr 16, 2013 | Konica Minolta bizhub C250 All-In-One...

2 Answers

Hp 4700 49.3066 service error

49.xx errors are mostly caused by invalid print commands, corrupt
data, or invalid operations. Basically the printer "does not understand" the print job.

- restart the printer to clear the print job from the printer's memory.

-if the error returns disconnect the network/USB cables from the unit and cycle power again.
If the error comes back without the network/USB connected perform a cold reset on the device and go the next step.
- Once the unit is at Ready reconnect the network/USB cable.

If the unit gets the 49.xx error or begins to print a job then gets the error disconnect the cables again and power cycle the printer. This time when you plug the network/USB cable in watch the control panel for any signs of the unit receiving a print job. When the printer says "Processing" press the cancel button on the printer. This should clear the "bad" print job.

I strongly recommend updating to the latest driver for the device Drivers Software . If you had an issue with a PDF file use the Post Script (PS) driver.

Good Luck

Jan 24, 2012 | HP LaserJet 4700 Printer

1 Answer

Clx2160 invalid imaging unit, How do t get into the test service mode to reset the counter or error message. The imaging unit is not invalid.

Try a factory reset by pressing menu->ID Copy->Left->Right->Menu->Black Start consecutively. p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 9.7px Helvetica}

Aug 27, 2010 | Samsung CLX-2160N All-In-One Printer

1 Answer

Error code C0F32

This error means Imaging Unit ATDC (automatic toner density control) failure. Open and close the right side door where the imaging unit is. If the code comes back you are going to need Imaging Unit service or possible Imaging Unit replacement. The best option and the cheapest is to locate a new imaging unit and replace it yourself. These units are very easy to change and similar to replaceing a toner cartridge in any laser printer. Just do a search for Di200 Imaging Unit.
Good Luck and Thank You for using Fixya.

Apr 14, 2010 | Konica Minolta DiALTA Di200 Copier

1 Answer

"Invalid Imaging Unit" after replacing toner cartridge

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 ,...

Jan 18, 2009 | Samsung CLP-550N Laser Printer

1 Answer


To continue turn off then on
A critical firmware error has occurred that
caused the processor on the formatter to
abort the operation.
This type of error can be caused by invalid
print commands, corrupt data, or invalid
In some instances, electrical noise in the
cable can corrupt data during transmission
to the printer. Other causes include poorquality
parallel cables, poor connections, or
specific software programs.
Sometimes, the formatter itself is at fault,
which is usually indicated by a 79 Service
1 Press CANCEL JOB to clear the print job
from the printer memory.
2 Turn the printer off and then on.
3 Go to,,, or
Select Download Drivers and
. Check for the latest firmware
image version at the bottom of the
page. If this firmware image is newer
than the one installed on the printer
and the printer can receive a firmware
update, download the newer firmware
upgrade. Not all
HP LaserJet 4200/4300 printers can
receive firmware upgrades.
4 Try printing a job from a different
software program. If the job prints, go
back to the first program and try
printing a different file.
hope this helps you

Dec 10, 2008 | HP LaserJet 2420dn Printer

1 Answer

My Samsung Color laser printer indicates all four color toners as 'invalid' despite changing them. It also indicates the imaging unit is invalid. It was bought new and functioned without any problems for...

When you changed the toner did you change the chip for them? you need a special chip for each and evry one of them. I had that problem with my CLX-2160 and i fixed it this way.

Dec 02, 2008 | Printers & Copiers

3 Answers

Intermittent "Invalid Imaging Unit" messages

sounds like your printer engine is starting to take a long unhappy downturn..

Jun 16, 2008 | Samsung CLP-500 Laser Printer

2 Answers

Invalid Imaging Unit and Toners

Sorry about my last post. I didn't realize that it would be placed unter solutions. BUT I did get a resolution from Samsung. They passed me to the advanced team and they suggested I use a special code they gave me to reset all the machine. As I said before the machine was giving me an error that all the toners and the imaging unit were invalid. Samsung said to try this and if it didn't work they would send me a new (refurb) unit. They said to press in sequence <menu><#><1><9><3><start (b&w)> then when the unit cycles it will ask to imput the country, in my case I entered the US. The machine will then reset itself and all the cartridges and imaging unit should be reset to work. IT WORKED!! The machine said to wait while it re-installs the toners. When it did the red warning light turned off and the printer is working great. Hope this helps.

Jan 07, 2008 | Samsung CLX 3160fn All-In-One Printer

Not finding what you are looking for?
Samsung CLP-550N Laser Printer Logo

1,820 people viewed this question

Ask a Question

Usually answered in minutes!

Top Samsung Printers & Copiers Experts


Level 1 Expert

185 Answers


Level 2 Expert

166 Answers

 Mike M
Mike M

Level 3 Expert

3320 Answers

Are you a Samsung Printer and Copier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides