Question about Brother HL 2140 Laser Printer

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Dots on the left side margin

Whenever I print a document, there are black "spots" up and down the left margin of the paper. Only on the left side, and some are as small as pencil lead, others as big as pencil eraser. Other than this, printer works great! Thanks!

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  • 191 Answers

This problem comes from drum cartridge, you may try:
1) take out drum cartidge open drum cover clean the surface at leftside(using soft brush) and check drum surface at leftside, there is damage if you see the color surface appear a broken-ring at leftside(the color changed), you have to change new drum cartridge,
2) sometimes cause cartidge clean brush dirty can not do well cleaning job, just clean this parts at leftside well then turning drum a little there is no toner appear at surfac leftside if ok.

Posted on Dec 21, 2008

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What can we do about dark toner spots that are appearing on the right side of documents we print? We have tried using a can of air spray to clean the inside of the printer, but to no avail.


I have a Brother HL 4040cn color laser printer and I had the same problem. On every page I printed there were these black dots that appeared down the right side of the page in regular intervals. I tried the automatic drum cleaner and that didn't work. I opened the printer from door, removed the black toner cartridge and looked at the drum. Sure enough there was a speck of black crusted toner stuck to the drum. I used a q-tip and lightly scrubbed at the spot to remove the toner then I used the gear on the left side of the drum to rotate it and check for any other smudges and there were none. Put the toner cartridge back in and it was good to go again...no black dots!!

Hope this helps someone because I couldn't find the solution myself when I searched.

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Measure the distance between two of the same coloured dots down the page, if it is just over 150mm then it is caused by scratches on the photoconductor drum (this is the only thing that has a 15.4mm circumference). Try printing a black and white only document, only the black dots should appear. Removing the photoconductor and gently polishing the blue drum with a soft cloth can help if the scratches are not too deep, otherwise a new photoconductor is the only route.

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do this procedure
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