Question about Brother MFC 7840W Printer

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The left side of my page is lighter than the right. The corona wire tab broke off - is this the issue - I need a new drum?

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  • 1,684 Answers

Yes,

The problem you are having is caused by a dirty corona wire and if the tab is broken off then you have no way to clean the corona wire to restore dark copies. You will need to replace the drum unit in your printer. The part you need is DR360.

Buddy
Corporate Computer

Posted on May 13, 2010

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Mar 01, 2011 | Brother MFC-8460N All-In-One Printer

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Says drum error, see troubleshooting maitainance chapter in user guide. Don't have a users guide. Printer is brother mfc-7340


I have this manual for you. I can be reached at LBrown18062@hotmail.com

http://welcome.solutions.brother.com/bsc/public/as/as_ot/en/doc/manual_index.html?reg=as&type2=-1&prod=mfc7340_us_as&c=as_ot&lang=en&flang=all

Drum Error - The corona wire on the drum unit needs to be cleaned.
Clean the corona wire on the drum unit. (See Cleaning the corona wire on page 122.)

Cleaning the corona wire: If you have print quality problems, clean the
corona wire as follows:
a. Turn off the machine's power switch.
Unplug the telephone line cord first, disconnect all cables, and then unplug
the power cord from the AC power outlet.
b. Open the front cover.
c. Slowly take out the drum unit and toner cartridge assembly.
CAUTION: We recommend that you place the drum unit and toner cartridge assembly on a clean, flat surface with a sheet of disposable paper or cloth underneath it in case you accidentally spill or scatter toner.
Handle the toner cartridge carefully. If toner scatters on your hands or clothes, wipe or wash it off with cold water at once.
To prevent damage to the machine caused by static electricity, DO NOT touch the electrodes shown in the illustration.
d. Clean the corona wire inside the drum unit by gently sliding the green tab from right to left and left to right several times.
CAUTION: Be sure to return the green tab to the home position (a) (1). If you do not, printed pages may have a vertical stripe.
e. Put the drum unit and toner cartridge assembly back in the machine.
f. Close the front cover.
g. Plug the machine's power cord back into the AC power outlet first, and then reconnect all cables and telephone line cord. Turn on the machine's power switch.

Dec 31, 2010 | Brother Office Equipment & Supplies

2 Answers

The ride side of my faxes and copies are black, any ideas?


Sometimes you may see vertical streaks/black lines on the faxes you receive. Either your machine's
primary corona wire for printing may be dirty, or the sending party's fax scanner may be dirty. Clean
your primary corona wire. I recommend placing the drum unit on a drop cloth or large disposable paper
to avoid spilling and scattering toner.
1. Clean the primary corona wire inside the drum unit by gently sliding the tab from right to left several times.
2. Return the tab and snap it into the Home position, (Caution: If the tab is not at the Home position, printed pages may have vertical stripes).
3. Reinstall the drum unit into the machine.
4. Close the front cover.
5. Plug in the power cord first, and then plug in the telephone cord.
or ask the sender to make a copy to see if the problem is with the sending machine.
Try receiving from another fax machine.
If the problem continues, call Brother Customer
Service at: 1-800-284-4329 (in USA) or 1-877-BROTHER (in Canada).

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The fax machine is saying remove the drum there is dust on the corona wire.


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Clean the corona wire in this manner every time you change the toner/drum.

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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

Vertical lines printed on right side of every page


Would be helpful to know the brand and model of the printer. Sometimes this is caused by not returning the slide used to clean the primary corona wire to its original position (usually to the extreme left side of the toner cartridge) after cleaning the corona wire. If you haven't cleaned the corona wire, you should follow instructions and do that first.

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Black lines on received faxes


look for a corona wire, close to the drum
  1. Clean the primary corona wire inside the drum unit by gently sliding the tab from right to left several times.
  2. Return the tab and snap it into the home position.
zl42b.gif Note
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