This middle aged unit with very light useage (2-3 cartridges) has for the last year or two started generating "Invalid Imaging Unit" messages say once a month. Initial it was a simple fix, unplug it and then plug it back in again but over time it started happening more frequently and unpluging the power does not solve it. Nothing has been changed on the printer for a year.
Novos41 is absolutely correct regarding the contacts. I can also get rid of this error message by opening and slamming the door on the right hand side of the printer. This reengages those pesky contacts. It's a very random problem with no apparent cause. I will be printing just fine, then next time I go to print I get the "invalid imaging unit" message, and one slam of the door almost always reengages the contacts. There is nothing wrong with the imaging unit, it's that the printer's "brain" cant see that it is there.
Your imaging unit has small contacts on the side. Usually opening the printer, removing and then re-installing the unit will fix it temporarily. Or you could pick up one corner of the printer about an inch or so then drop it. Sounds strange i know but it worked for me. Of course you could always wipe the imaging unit contacts with alcohol on a cotton swab then re-install it. I own one of these printers and I like it for what it is. I've had a few problems with it but I bought it for 25 dollars from a second hand store. The IR sensor sending unit was bad but I replaced the light from a universal remote for about 4 dollars and it works good now so I can't complain.
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1) Grab the front cover grip and
open the front cover
2) Pull the handle of the imaging
cartridge toward you, and then
pull out the imaging cartridge. Note
Do not expose the imaging
cartridge to light for a long period
of time, otherwise decreased
image quality may result.
3) Pull out the jammed media along
the feeding direction.
If media is jammed in the fusing unit,
pull the media downward to remove
The fusing unit is extremely hot.
Touching any part near the fusing
unit may result in burns.
Do not touch the image transfer
roller inside the printer, otherwise
decreased image quality may
4) Align the imaging cartridge with
the guides in the printer, and
then insert the cartridge. Note
Do not insert the imaging
cartridge at an angle or with
extreme force, otherwise the
printer may be damaged.
5) Press on the front cover grip and
close the front cover.
If the message Change Imaging Unit Magenta displayed refer to imaging unit with contents a developer.The Imaging unit life is 80.000 copies. The imaging units located after front door when is located the waste toner box. If the message M toner end/change the M toner displayed refer to toner cartridge The toner cartridge life 15.000 copies 5% saturation.In full color mode the color saturation is 80% and the color toner life is 6.000-8.000 copies. I think your problems is a toner not the developer.
Remove the imaging unit ,remove the charge corona assy,remove the OPC drum,remove 2 screw and dump the developer out.Reinstall the imaging unit ,pull out the toner cartridge and push in toner cartride ocation the developer cartridge.Turn on the copier and wait then the copier perform the new developer initialization.Whwn the Start button in ready(green light),change the developer cartridge to toner cartridge.
Here your problem.
The imaging unit creates the image using an electro-photo process. The imaging unit consists of the following:
■ An OPC Drum
■ Waste Toner Assembly
■ Charge Roller Assembly
9.0 Consumables, Routine Maintenance Items and Options
Item Life based on 5% coverage Part No. Replaceable by
Black Standard Toner Cartridge
Black High capacity
Cyan Standard Toner Cartridge
Cyan High capacity
Yellow Standard Toner Cartridge
Yellow High capacity
Magenta Standard Toner Cartridge
Magenta High capacity
Imaging Unit 50,000 images 108R00593 User replaceable
Transfer Belt 50,000 images 108R00594 User replaceable
500-Sheet Feeder N/A 119650600
Waste Toner Cartridge 3,000 to 5,000 pages (color 5%) 106R00683 User replaceable.
Your imaging unit may have exeeded it life of 50,000 pages and will need to be replaced.
Hope this helps
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.
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.
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.