Question about Brother MFC-9440CN Laser Printer

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Light print on side of paper. color black copies, print, internal

I cleaned the belt, drums, toner area, coronas on drum unit, inside by drum doors, glasses everything i could think of. didn,t open laser unit to check them machine 6 month old. have 2 (black & yel) reman toners but light happens with all print copies, print, internal reports, in color or black

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Ninty-five percent of all image issues like this are caused by the carona-drum-toner assembly. I have not worked on this model but the only way to diagnose the issue is to try a new drum / toner cartridge and see what impact it has. Then once you resolve the issue you can discuss the service life after the fact.

Posted on May 12, 2010

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My Brother MFC-7420 Printer always prints black lines and splotches down the left side of my paper. This happens whether I'm scanning or printing from my PC. When I looked at my drum, it appears a


If you are seeing vertical streaks/black lines your primary corona wire is dirty and or the fax scanner may be dirty.
1)To clean the corona wire you take the drum unit and toner cartridge and place it on disposable paper to avoid spilling.
2) Clean the primary corona wire inside the drum unit by sliding the blue tab from right to left several times.
3) Return the blue tab and snap it into the home position.
4) Reinstall the drum unit and toner cartridge.
5) Close the front cover.
Caution: if you do not return the blue tab to the home position it may repeat the black lines.

Nov 29, 2012 | Brother MFC 7420 All-In-One Laser Printer

1 Answer

My Brother HL 4040cn printer is leaking toner, black and yellow. It leaves spatter spots of these colors on printed pages. The machine does not have any messages. Do you know what this may be from or how...


If you've taken the printer apart and cleaned the belt unit and everywhere else in the paper's path, then it is probably either a bad toner cartridge or the drum. Since it's multiple colors producing splatter, its most likely the drum unit. Try taking the drum out and removing all of the toner cartridges and then clean the drums and corona wires. If its still producing splatter afterward, you've got yourself a bad drum.

Jul 20, 2011 | Office Equipment & Supplies

1 Answer

What does opc belt do ?


OPC Belt (Organic Photo Conductor)
A photoconductor is a material that conducts electricity only when exposed to light. Photocopiers and laser printers have a large roller or belt coated with photoconductive material. As this drum turns it is electrically charged by a high voltage corona wire. The next step is to reflect an image using a laser beam or reflected light from mirrors onto the drum as it turns neutralizing the charge where light hits leaving a latent image or static charge in the shape of the image you want to copy.

The next step is to turn the roller past a brush made of toner (colored plastic particles). The static charge will pull the particles onto the charged area of the drum forming an image you can see, next feed a piece of paper onto this turning drum, as you do apply an opposite charge using a second high voltage wire (transfer corona) to the back side of the paper, causing the paper to stick to the toner/drum (opposite charges attract). Separate the paper from the drum using a high voltage alternating current (separation corona wire). Melt the toner into the paper with hot rollers. This will create a black and white image.

Jun 17, 2011 | Brother MFC-9420CN All-In-One Laser...

1 Answer

Vertical Lines through incoming faxes and copies.


Sometimes you may see vertical streaks/black lines
on the faxes you receive. Either your FAX/MFC's
primary corona wire for printing may be dirty, or
the sending party's fax scanner may be dirty. Clean
your primary corona wire (see pages 13-18), or ask
the sender to make a copy to see if the problem is
with the sending machine.
Cleaning the Drum Unit
We recommend you place the drum unit on a drop cloth or large piece of
disposable paper to avoid spilling and scattering toner.
1 Carefully turn the drum unit upside down.
2 Clean the primary corona wire inside the drum unit by gently sliding the tab
from right to left several times.
3 Return the tab to the Home
position (  ) before
reinstalling the drum unit.

Jan 31, 2011 | Brother IntelliFax-2920 Plain Paper Fax,...

1 Answer

Have a black line on all my scanned files, runs the length of the page, about 1 1/2 inches from the left edge.


To determine if the vertical lines appearing on your printed documents are related to a printing or scanning issue, print a test page by pressing MENU, 4 (Printer), 2 (Print Options), 3(Test Print) and COLOR START.
If the vertical lines appear on the Test Print continue to Procedure A:Cleaning the Corona Wires Inside the Drum.
If the vertical lines do NOT appear on the Test Print continue to Procedure B: Cleaning the Scanner Glass.
Procedure A: Cleaning the Corona Wires Inside the Drum:
NOTE: Brother strongly recommends that customers do not use generic drumunits and/or toner cartridges, or refill their Brother toner cartridge. Each Brother laser printer is designed to work at pre-set temperatures that are matched exactly to each of our individual toner formulations. Each individual component is designed to work with the other to ensure quality and reliability. Using non-Brother supplies may affect the hardware performance, print quality and machine reliability. The Brotherlimited warranty does not apply to any problem that is caused by the useof unauthorized third party drum units, toner cartridges or toner.
A1. Power off the Brother machine using the power switch located on the right side of the machine.
A2. Press down on the front cover release lever and open the front coverby pulling it towards you.
A3. Hold the green handle of the drum unit (labeled 1). Lift the drum unit up and then pull it out until it stops.
NOTE: If you cannot pull the drum unit out, make sure that the front cover is fully open.
A4. Remove the toner cartridges one at a time, by holding the handle of the cartridge and lifting it up and out of the drum unit.
Note: We recommend you place the toner cartridge(s) on a clean, flat surface with a piece of disposable paper underneath it in case you accidentally spill or scatter toner.
A5. Lift the white plastic corona wire cover by lifting the tabs locatedon the right and left side of the cover.
A6. Clean the corona wire inside the drum unit by gently sliding the green tab from left to right several times.
Note: Be sure to return the tab to the home position. If you do not, printed pages may have a vertical stripe.
A7. Close the corona wire cover.
A8. Repeat Steps 5 through 7 to clean each of the remaining three coronawires.
A9. Reinstall the toner cartridge(s):
NOTE: Before reinstalling the toner cartridge, shake the toner cartridgeside to side.
Hold the handle of the toner cartridge and slide the toner cartridge into the drum unit. Make sure that you match the toner cartridge color to the same color label on the drum. Fold down the toner cartridge handle once the toner cartridge is in place. Repeat this for all the toner cartridges.
A10. Push the drum unit back into the machine until it clicks into place.
A11. Close the front door and power on the Brother machine.
A12. Print a test page by pressing Menu, 4 (Printer), 2 (Print Options),3(Test Print) and Color Start.
Procedure B: Cleaning the Scanner Glass
B1. For safety reasons, power the Brother machine Off using the power switch located on the right side of the machine.
B2. Lift the Document Cover and clean the following with a lint-free cloth moistened with a non-flammable glass cleaner:
a. Run your fingertip over the scanner glass of the flat bed to check for debris. If you feel debris, clean the entire glass area but concentrating in the area in which you felt the debris. (Caution! Do notpress down on the glass very hard.)
b. Run your fingertip over the scanner glass on the left to check for debris. If you feel debris, clean the entire glass area but concentrating in the area in which you felt the debris.
c. The white plastic pad located on the underside of the Document Cover
d. The white plastic pressure bar located to the left of the white plastic pad.
B3. Close the Document Cover.
B4. Test the machine by making a copy of a blank sheet of paper using the ADF (Automatic Document Feeder) and a copy using the Flat Bed.
a. To make a copy using the ADF, place the document face UP in the ADF, press the COPY mode key located below the LCD display and then COLOR START. If the problem continues,repeat Steps 2b and 2d at least 3 additional times.
b. To make a copy using the flat bed, lift the Document Cover of the flat bed, place the document face down on the scanner glass (make sure the ADF is empty) and close the Document Cover. Press the COPY mode key located below the LCD display and then COLOR START. If the problem continues, repeat Steps 2a and 2c at least 3 additional times.

Oct 29, 2010 | Brother MFC-9440CN Laser Printer

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.

Dec 22, 2009 | Brother IntelliFAX 2800 Laser Fax

1 Answer

Dell 3000cn has vertical white lines on


Copied from the Dell community forums:

This is from a previous post and may help with your problem. I have printed 1000's since I came up with this fix with no recurrence of any streaking. Let me know how this works for you. I have come up with the cause and a fix for the above problem. This also fixes the problem of lines running the direction of paper travel on color prints. Black and white prints are OK. If you have a warranty on your printer or drum unit then you can have the drum unit replaced and hope you get a good replacement drum unit. To fix your drum unit do the following: 1. Remove the drum unit from your 3100cn. 2. Set the drum unit on a clean level surface and avoid touching the drum or the transfer belt (the decal with 4 arrows points to the transfer belt). 3. Remove the 6 screws from the top cover (the cover has the blue handle attached). Two screws are on top at both ends of the blue handle. The next 2 screws are on the sides and line up with the decal with 4 arrows. The last 2 screws are also on the sides and at the lower corners of the big decal that shows how to remove the drum unit from the 3100cn. 4. Carefully lift the cover from the drum unit and cover the drum unit with clean paper to protect the transfer belt from bright light. You can carefully reinstall the drum unit without the top cover and run some color prints. If the lines are gone then continue with step 5. 5. Look at the ribbed side of the top cover. Some may show some toner build-up. Some of the rib intersections are too high and are dragging in the toner that is applied to the transfer belt. The ribs are there to add stiffness to the cover and to keep it from bowing. 6. Place the cover handle side down on a clean towel. 7. Using a palm sander with 320 grit sandpaper and light pressure (the weight of the palm sander) sand until the ribs going both directions are showing signs of being sanded. You will be able to see the difference as unsanded areas will be glossy and sanded areas will have a dull finish. 8. Switch to 600 grit paper and do a light sanding. 9. Wash the cover under cool water. Don't use hot water since that could cause the cover to bend. 10. Dry completely. I used compressed air. 11. Reinstall the cover to the drum unit. Tighten the 4 side screws first and then the 2 top screws last. 12. Put the drum unit back into the 3100cn and try a color print. 13. Please post if you have any questions about the procedure. 14. If your next drum unit has the same problem you can swap top covers.

Message Edited by Ron13863 on 09-04-2007 07:16 AM

Nov 16, 2009 | Dell 3000cn Color Laser Printer

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

2 Answers

Black smudges on copies


Hi, try to pull out complete process unit(cartridge) with toner box .You have cleaner(blue or green color) move this cleaner from right to left side 4 or 5 times.Note that cleaner MUST be in home position-right side when you finish.Check print.
If problem still persists, you must do following:take away small grey plastic cap on left side of cartridge,then push complete charge corona(part with cleaner on top of it) to left side just enough to lift right side of corona from cartridge.Pull out that corona and you can see drum and developer roller. Turn the gear on drum,and look for smudges on black developer roller.Try to clean smudges with brush or with dry cloth.Toner will again attract to that area,but regular.

Dec 11, 2007 | Kyocera Mita KM-1815 All-In-One Laser...

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