Question about Samsung CLP 300 Laser Printer

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Imaging unit clp300

In middle of printing run, computer tells me to replace imaging unit
But there was nothing wrong with the unit, is this a way for samsung to generate more income by adding a chip to the imaging unit, As it happens i have another printer and i interchanged the units and i get the message from the unit and not the printer body. Maybe it could be a reset on the imaging unit. I estimate i have done about 4000 copies with the unit. If it is a chip in the imaging unit i will seriously not consider purchasing a Samsung again as this smacks of underhanded tactics. Any ideas


Guy O'Callaghan
South Africa

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it is more likly that your OPC Image unit has print more than 25K +/-. that the printer will course the prompt.

press and hold the button of the printer for 5sec and let go. it will print out the supplier info of the printer life spend.

there is no way to reset the OPC count unless you work in Samsung.

Posted on Apr 19, 2010

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I assume that you made some alternation to the printer the it sense the change and blow the resistor of the imaging unit.all you need to do is check the resistor by the side of the imaging unit if it is blown replace it with same value but a stronger one.

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If the print is faded down the length of the page, then the problem lies within the imaging unit. This is a very commn problem with this printer. The developer blades get blocked by a coating of toner, which after many prints, cause a noticable fade in the image. This can be fixed by replacing the imaging unit or the blades can be cleaned. I have detail instruction in my tips section. It can be done quite easily if you are handy, and you could save yourself some money by not buying a new imaging unit.

Apr 22, 2010 | Samsung CLP 300 Laser Printer

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My samsung clp300 prints black in draft (even though everything is set on normal) - colours are okay. Replaced black toner - same problem. help!

This is a problem in the black developer in the imaging unit.
Kindly replace the black developer from authorised service center.

Oct 26, 2009 | Samsung CLP 300 Laser Printer

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Black printing faded although toner not low

metering blade is gunked up. You need to dissasemble part of the imaging unit to fix the problem. Clean it. put it back together and BINGO! Like new. Do this before throwing money into buying a new imaging unit.. You can thank me when this works

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Faded stripe down the printed page

I found a solution that worked to eliminate the faded black stripe down the page thanks to a post by slamfix in another forum. The problem is related to ink build up on the blade edge of the black developer assembly in the imaging unit (the imaging unit contains 4 separate developers - yellow, blue, magenta, and black). The solution involves taking out the imaging unit, removing and cleaning the blade edge of the black ink developer until smooth. It took me about 15 minutes to complete and was fairly straightforward.

Detailed instructions with pictures can be found at

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It really sounds like you need to replace the imaging unit.

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COF37 error code

C0F37: Abnormally high toner density detected by Black ATDC Sensor
Toner density that is 4 % or more higher than the target level is detected ten consecutive times during a print1.gif cycle, ATVC, or image stabilization sequence.

The sensor for this error is in the black imaging unit not the toner hopper. See the steps below. If that doesn't work then visit my website1.gif for contact and I will sell you a full service and or parts manual on CD.

Check Item
Imaging Unit Bk is installed correctly.
Check and correct ATDC

drawer CN of imaging unit Bk.
Each of Imaging Unit Bk contacts makes
Clean or correct.

good contact.

ATDC Sensor harness is open-circuited.
Change Imaging Unit Bk.

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