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Where is corona wire - Brother MFC 7840W Printer

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Corona wire. Remove the toner cartridge with the drum. In the back of the drum you will se a green button on the right side. To clean it, slide it to the left and right several times and park on right hand side. Reinstall.

Posted on Jan 25, 2013

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Posted on Jan 02, 2017

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1 Answer

How to clean corona wire on brother 7840W


Corona wires are in the drum cartridge, small screen or grid over them. usually there is a colored slide that you can move back and forth to clean coronas.

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Laserjet 3050 does not use corona wires. HP uses a PCR roller which applies the charge to the drum unit. HP stopped using corona wires on most units years ago. What print problem are you having that makes you think that you need to clean the corona wire?

May 01, 2011 | Office Equipment & Supplies

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Feb 19, 2010 | Konica Minolta DiALTA CF910 Copier

2 Answers

Copies are black and where is this corona wire? I


Your cartridge has two sections, the drum and the toner section. The corona wire is on the drum section. There should be a blue tab on the top left hand side of your drum unit. Slide this tab across the cartridge one or two times, returning the tab to its original position. There should be an arrow on the blue tab that will match up with an arrow on the drum unit when the tab is in its resting position. Performing this action cleans the corona wire inside the cartridge. If this doesn't fix it you may need to purchase a new drum unit.

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1 Answer

Black lines through printed pages have cleaned unit and replaced black drum unit.....still have black lines


Clean the charge corona wire/charge corona roller and the charge corona wire gride,and the transfer/separation corona wire/roller.After clean the units and clean the optical section perform the auto image adjust mode.

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1 Answer

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Try to get some corona wire stock which was quite common back in the day and install it in your drum.

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I was getting the clean the corona wire problem message even after repeated cleanings.  Before this problem occured the toner light was flashing warning of low toner. When I got the clean the wire pop up the toner light was on all the time indicating the toner was depleated.  So, I thought I would try replacing the toner cartridge and see what happened. I opened the new toner box and noticed on the foil packege specific instructions to clean the corona wire when installing the new toner.  I installed the new toner and cleaned the wire one more time. I then reinstalled the drum and toner assembly into the printer and the clean the corona wire message did not come up again.  The printer now works fine. 

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2 Answers

Dirty Edges


I'm sorry to tell you, this is likely a drum issue.

You probably need to have a certified engineer examine the machine.

Have you tried speaking with the local service center to see if they have experienced similar issues? It might be free information.

Erik.

May 13, 2008 | Xerox WorkCentre XD120F Laser Printer

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