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

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Where is the corona wire located - Brother MFC 7420 All-In-One Laser Printer

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Hi

check out the following link,
it shows the location of the corona wire near the drum unit and how you can clean it

http://welcome.solutions.brother.com/BSC/public/us/us/en/faq/faq/000000/000400/000035/faq000435_001.html?reg=us&c=us&lang=en&prod=mfc7420_all

thanks and regards

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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This is usually a corona wire problem. There are three corona wire units in the copier. You probably need new corona wires strung, or units. You may get lucky though and just have a hung transfer/separation corona wire cleaner. This is visible if you slide out the transport unit by opening the front door and releasing the green handle, then sliding the drawer assembly out. Look for the unit with the 3 thin, hair thickness wires running front to rear in the silver cavity located just to the right of the black rubber wide transport belts. The unit will have a white plastic "bridge" on it. Look to see if there is an assembly that has cleaner pads on it stuck somewhere along the wires. If it is, be careful and slide the assembly all the way to the front of the corona unit. If there is a problem though, the next time it cleans the wires it will get stuck again. You will probably have to contact an authorized Canon dealer for repairs and parts. This model is very old now, and discontinued/obsolete. Getting parts may be an issue.

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No corona wire is there on this model, you can find one saw teeth like portion inside the main charger it serves the purpose of corona wire you can find the charger assembly on the drum unit, you try to clean the charger assembly by washing it and drying it buy the sun light, better to replace the maincharger, drum, cleaning blade, and developer together. Rate this and vote for this .

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We are getting Error Code SC305 when we try to print.


Looks like toner buildup on the corona wire. Turn it off. Wait for 10 seconds and turn it back on, that should cause the device to clean the wire. If that doesn't work, another tech gave this advise:

This SC code relates to the charge corona cleaner not working or not working properly. the charge corona is located towards the bottom left of the machine after opening the front cover. It will have a screw you can undo by hand and a cable with an end like a telephone cable plug. toner may have fallen in to the unit or the motor that drives the cleaner along the wires has decided to jam up. remove the charge corona and blow it out with compressed air. You can also remove the end of the unit and check that the motor is not gummed up. Be very careful you do not break the hair thin corona wires! Hope this helps.
Dave T (username: munybuny)

Hope you don't need to call in an on-site tech.

Thanks,
Steve G.

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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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Fax machine has a message that says "open front cover to remove the drum. Clean the corona wire located on the drum."


The fax machine instruction must be done to erase the
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Dear sir; I try my best to descript for you, corona wire have two, one we call charge corona wire it located above the drum,when you open the door you will see the toner cartridge on the bottom left corner of the toner ctg you will find a 1" squar blue plastic push up and pull out. the another one we call discharge corona wire, it located right under the drum unit, open the door lift up the **** shellon the bottom middle with a red plastic head, you have to remove waste toner bottle and then you can see a screw loose it ,lift up and remove the unit,you can use Q-tip withrubbing alcohol to clean it, hope you can find it. need help? I always here,
Good luck, let me know if you made it, thank you.
HAVE A HAPPY HOLIDAY !!!

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The paper keeps jamming in my konica photocopier and the following message appears F28 3 Contact service department


F28 High voltage leak. (coronas)

The corona wires are arcing, it is located directly under the drum a unit with three thin wires. the end blocks go bad and it arcs causing jams and copy quality problems, replace the corona ***'y.

Other cause may be the High voltage unit for the coronas itself

check this site for the price

precisionroller.com

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