Question about Samsung CLP-500 Laser Printer

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Intermittent "Invalid Imaging Unit" messages

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.

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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.

Posted on Apr 01, 2013

  • Jeff Spurgat
    Jeff Spurgat Dec 14, 2013

    This worked for me, though I did not need to slam the door, but rather just open and close the door.

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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.

Good luck

Posted on Jun 03, 2010

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

Posted on Jun 16, 2008

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