Question about Brother MFC 7420 All-In-One Laser Printer

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Duplicated print on page

When I print I am getting an imprint of the print body further down the page as a faded image

I have cleaned rollers etc

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The cleaner of the image drum is not working.

This can consist of ekectrostatic discharge wires OR more likely ios INCOMPLETE transfer of toner due to defect in the charge wires that cause the toner to transfer from the drum to the paper.

Inspect the wires for contamination and use a Qtip to CAREFULLY clean both the very fine wire and the metal channel it is in. Checking the voltage on this wire is beyond what the DIY person can do.

Posted on Jul 04, 2010

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My Canon MF4150 is printing fine but when it prints a page, the content on top get duplicated (faded) below.


If you're getting the image repeated further down the page, but faded, it's most likely a fuser problem. The rollers in the fuser (or the fuser itself) will need to be replaced.

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A 1/4 inch stripe of magenta ink runs down the side of all pages printed.


Hi ,
Dirty print out is mostly due to cartridge related issues. In this case it seems that magenta is the issue. Take out the cartridge and clean its drum/ (green roller) with a dry, soft, lint-free cloth. The drum is located under a cover. Checkout for any spilled toner inside the printer and clean it also. Print a few pages so that the parts get further cleaned. I think, this would solve the issue.

Moreover, streaks (thicker lines) and dots etc indicate faulty PCR Roller which is located just behind the green drum inside the cartridge. Try cleaning it or replacing the Magenta Cartridge. If required, get the PCR Roller changed by a professional.

Let me know if any further clarification is required.
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CreativeTECH

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When I print from my Sharp AR-M256, a black line appears on the paper. What can I do to fix this?


Dirty print out is basically due to cartridge related issues. Take out the cartridge and clean its drum/ (green roller) with a dry, soft, lint-free cloth. The drum is usually located under a cover. Checkout for any spilled toner inside the printer and clean it also. Print a few pages so that the parts get further cleaned. I think, this would solve the issue.

Moreover, black streaks (thicker lines) and dots etc indicate faulty PCR Roller which is located behind the green drum inside the cartridge. Try replacing the cartridge or get the PCR Roller changed by a professional.

Let me know if any further clarification is required.
GoodLuck!
Dont forget to appreciate the solution if I could have been of any help!
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Getting a stripe down the image


Dirty print out is basically due to cartridge related issues. Take out the cartridge and clean its drum/ (green roller) with a dry, soft, lint-free cloth. The drum is usually located under a cover. Checkout for any spilled toner inside the printer and clean it also. Print a few pages so that the parts get further cleaned. I think, this would solve the issue.

Moreover, streaks (thicker lines) and dots etc indicate faulty PCR Roller which is located behind the green drum inside the cartridge. Cartridge or get the PCR Roller changed by a professional.

Let me know if any further clarification is required.
GoodLuck!
Dont forget to appreciate the solution if I could have been of any help!
CreativeTECH

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1 Answer

The black print jobs have a shadow about 3 inches down the page


I had replaced the fuser - no improvement. I removed the fuser, imaging unit & transfer roller. CAREFULLY using a vacuum cleaner I cleaned all units and the internals of the printer, rotating the roller on the imaging unit to clean all parts. (Warning Place Imaging unit on paper as toner escapes) After a few test prints the page cleared and duplicate ghosting cleared.

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Needs a good clean. The fuser isn't completely setting the text so it's sticking to the roller and coming back round on the paper further down.

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Change the fuser unit if you have to hand. The problem is likely caused by a lack of pressure from the pressure roller. Also check the transfer roller for a similar ghost image.

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I ran the hp toolbox "cleaning" mode too and it did not help the problem at all. I still have a dark smear concentrated in the middle of the page, and ghost images repeated lighter all the way down the page.

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This is not a cartridge problem, it a the problem with the scanning unit which is not providing the imprint proper on the cartridge drum while throwing a printout. If you are techi guy get the unit opened and clean the glasses inside the scanning unit which will definitely take care of the issue. I have experienced this many times and have fixed the problem myself.

The scanning unit looks like this

d70576a.jpg

The black plastic box is the scanning unit you can remove it open it and clean the dust accumulated on the glasses.
Need further help please ask.

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Here's the 'secret' sevice manual: http://www.feedroller.com/Store/Service%20Manual/50_53_5600.PDF
I would also (very carefully) check for torn paper around the rollers of the imaging drum that might be rubbing the area.

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