Question about HP LaserJet 2840 All-In-One Printer

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Black streaks when coping

Why does our 2840 leave 1/3 of a section of the paper black and fades away on the other 2/3 rd's? It has done this since it was about 1 month old....
Larry

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  • michelleann Apr 12, 2009

    I have the same print problem, 1/3 of the page prints and 2/3 of the page does not. I replaced the black cartridge, it ran through a self-clean mode and it is still there.

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The carousel that the toners are in has probably slipped a tooth on one of the gears at the sides. Look at the toners while they are in place and check that they appear level and consistant when compared to another straight edge adjacent to them. The carousel timing will require adjustment if they are not level.

Posted on Apr 20, 2009

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To perform a clean reset:

1) Press and hold the Calendar button, the Power button, and the Messaging button.

2) While holding these buttons, use the stylus to lightly press the Reset button on the bottom of the HP iPAQ.

3) When the Pocket PC screen begins to fade, release all of the buttons, and then remove the stylus from the Reset button.

The HP iPAQ restarts and powers on.

Make sure you hold the keys down long enough.

Posted on Mar 22, 2009

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1 Answer

Black stripe when printing from hp laserjet 2840


Cartridge faulty...
Two ways you can find out the faulty cartridge.
1. Remove each cartridge, just flip the drum shutter & chk for any toner bands appears on drum surface.. if found replace that cartridge..
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When we attempt to print it leaves black streak marks. At first it printed all black and when we went to setup under maintainence we chose alignment and clean cartridges. This worked however we still see...


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If the streaks are black where it should be white, is sounds like some dust or fluff below the cartridge leaves ink smears on the page.

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Streak down the center of the page


The streak is most likely the toner or the fuser

This is the test to determine toner or fuser issue.
Print a test page
When you hear the paper feed into the machine open the top or front to stop the machine
Remove the toner cart.
You should be able to see the page with printing on it. (This is before the page hits the fuser)
If you can see the defect on the page the problem is most likely the toner cartridge but NOT the fuser.
If the page is clean the problem is most likely the fuser.
Hope this helps

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Black streaks through pages


There can be some reasons:
1. The Fuser is too cold, so toner was not fixed
2. Image Transfer Belt is defect or dirty

Greetings from Germany

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What causes the toner to leave color streaks on the paper? It's leaving red streaks and I've replaced the magenta & black developers....but could it be the PCU causing the problem?


The developers almost never streak. I would be looking at your PCUs. Developers have a tendency to leave voids and dust the paper. PCUs tend to streak as the cleaning blade and charge roller wears out.

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Black steak on copied paper


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.

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