Question about HP LaserJet 2840 All-In-One Printer

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Black steak on copied paper

The printer makes a black streak on the paper that is copied. It only happens when making a photo copy of a page. Documents from the computer come out beautifully.

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Clean the scanner glasses, check the little glass, if it have scratches. There is a white strip across between the 2 glasses, be shure to clean it up.

Posted on Nov 03, 2008

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Canon NP6221 copier makes copies with black streak down middle.


I suggest You Go to Official Canon Printer Page For You Canon Problem On Below Canon Page URL:
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After a few copies are made, black streaks start showing up on the copies and gets worse with each successive copy


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Adjust the printer's lightness/darkness setting to 2-3 different variables and see if problem disappears. Look at the fusing assembly - is the roller torn or does it have any black buildup? Use caution!!! It gets HOT!

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Copier, Printer black streaks on copy or all black page


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Black streak down side when making a copy


Hello sir; I believe you need to replace drum cleaning blade.

Mar 12, 2009 | HP Office Equipment & Supplies

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Print quality


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When you use photo or other specialty paper, especially when the thickness is greater than inexpensive copy paper, the print heads need to match the paper.
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HP Officejet 6300 All-in-one machine makes black streaks


The problem is that that there a small piece of glass that the doc feeder use's to scan the orginal. You will have to clean the small glass it's about a half of a inch piece and is normally under the doc feeder unit. It will either be to the right side of the main copy board glass or it is under the doc feed unit where the paper goes down through the feeder. It is mostly some white out on the glass, just clean with a dam cloth with water or windex..... Good Luck

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Blank Streaks


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If you make a copy and it does not show a streak then it was done by the person sending the fax. BUT, check this,

open door and take out toner cartridge. look for a thin glass that is on the bottom of the machine and wipe it. Toner spills will cause a black streak.

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1 Answer

HP 7410 streaks on scanning and copying


First you need to determine if it's doing from both the  top and the glass.

1-assuming you are using the feeder to fax,copy or scan (the part that automatically picks up the paper) it comes out with a streak. Make a copy putting the paper on the glass and look at the copy. Does it have the streak?

2-lift the top and look to the left there should be a small 1inch glass, this is where it makes the copies from the feeder, is there a dot or white out or is the glass dirty? that's your streak, the paper is moving to make the copy,so the dot now looks like a line as opposed to making a copy on the glass it just sits there so a dot will stay a dot.

2- Clean with water or alcohol.

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