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:
http://pcproblemi.blogspot.com/2008/08/replacing-imaging-unit-on-samsung-clp.html
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.
Did you recently change any consumable part (toner, drum, etc)?
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.
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}
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Encountered 'invalid imaging unit' when attempting to print.
my printer says "invalid imaging unit", although I haven't changed ANYTHING in weeks (toner or whatever). i didn't even refill the paper. nothing.
???
Yesterday the clp 550 worked well, today ist says: "invalid imaging unit", and doesn't work. I didn' t chance anything!
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