Question about Brother MFC-9420CN All-In-One Laser Printer

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Close the back cover--but back cover is closed

Wont print because it insists that the back cover is open. Used to have to squeeze the back cover until you could hear it "catch", now it won't even catch and I can't tell where the sensor is.

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Re: Close the back cover--but back cover is closed

The "sensor" is a simple switch, that is built into the printers backside, on the left hand side (seen from the front). A small plastic pin, that is screwed into the back cover, pushes this switch, when the cover is closed, but ...

The back cover mechanism is designed very poorly. The locking mechanism is on the opposit side of the printer. So cover is not held in position anywhere close to the sensor. This is causing the switch to "flicker" or to become "open" during operation.

Quick and dirty fix:
1) Ask you wife for one of these plastic kitchen sponges.
Any plastic sponge with a height of 6 to 8 cm (3 to 3.5 inches) will be fine.

2) Open the back cover. Standing behind the printer, on the top right inside of the cover, there is a small white pin fastened with one screw. Losen that screw a bit, pull the pin out as far as possible (to make it as long as possible) and fasten the screw again.

3) Close the back cover

4) Take the (dry !) kitchen sponge and push it into the gap between the top of the back cover and the bottom of the flatbed scanner. Still looking at the printer from the backside, it has to be in the right 30 percent of the cover. The sponge gives enough pressure to hold the cover down just a bit and this is the trick to solve that issue dirty but permanently ...

Regards, Michael

Posted on Mar 29, 2008

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  1. Open the Outer Back(Rear) Cover (1) at the back of the machine. Pull the jammed paper out of the machine.

  2. Close the Inner Back(Rear) Cover (1) if it is open as shown in the illustration.

  3. Close the Outer Back(Rear) Cover. Make sure the cover is closed properly.
  4. Pull the paper trays (1) out of the machine.

  5. Push the two green levers up on both sides.

  6. Pull out the jammed paper (1) and press Stop/Exit.

  7. Push the green duplex unit up.

  8. Reset the machine by lifting the scanner cover from the front of the machine and then closing it.
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  9. Using both hands, use the plastic tabs on both sides of the machine to lift the Scanner Cover (1) into the open position. Make sure that there is no jammed paper left in the corners of the machine under the plastic covers.

    • If ink gets on your skin or clothing immediately wash it off with soap or detergent.

    • If the paper is jammed under the print head, unplug the machine from the power source, and then move the print head to take out the paper.

    • If the print head has stopped in the right corner as shown in the illustration, you cannot move the print head. Press Stop/Exit until the print head moves to the middle. Then unplug the machine from the power source, and take out the paper.

    1. Gently close the scanner cover using the finger holds on both sides of it as you push down on the Scanner Cover Support (1).
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    1. Push paper tray #1 and paper tray #2 firmly back into the machine.

    Note Make sure you pull out the paper support until it clicks.


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If the printer is turned on, turn it off then unplug from the outlet
Open the cover and move the ink cartridge holder to the middle part
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Bring down the gray lever then close the cover
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Put the cartridges back to their position
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Make sure the printer is on. Lift the scanner unit to access the cartridge area. The cartridge carrier will automatically move to the center at the loading position. Squeeze the tabs on the cartridge lids, and then lift the lids. Remove the used cartridges. (refer to sample image below. printer shown may not look like your printer, however, the steps are the same.)

Insert new cartridges. Color cartridge should be in the left carrier and the black in the right carrier. Snap the lid closed. Lift the scanner unit and push the scanner support back while lowering the scanner unit until it is completely closed.
Sometimes the ink cartridge carrier won't position automatically to the middle even when the printer is on and the cover is open. Just unplug the printer from the power source. With the cover open, hold the solid white strip and gently slide the carrier to the middle of the printer. Load the cartridges. Close the cover. Plug the printer back to power source.

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How do you change the ink cartridge on an epson DX4450? many thanks


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Press the Stop button. The print head moves to the position to indicate which cartridge is low or expended.

Press the Stop button again. If another cartridge is low or expended, it moves to the teardrop position. Press the Stop button again to see if more cartridges are low or expended. If no other cartridges are low or expended, the print head moves to the replacement position on the right.

Open the cartridge cover.

Squeeze the tab on the cartridge and lift the cartridge straight up to remove it. Dispose of it carefully. Do not take the used cartridge apart or try to refill it.

Before opening the new cartridge package, shake it four or five times.
8. Remove the cartridge from the package, but be careful not to touch the green chip on the cartridge.
9. Remove the yellow tape from the bottom of the cartridge. Caution:
Do not remove any other labels or seals, or ink will leak.
10. Insert the new cartridge into the holder and push it down until it clicks into place.
11. Once you replace all the necessary cartridges, close the cartridge cover and push it down until it clicks into place.
12. Release the scanner support and close the scanner.
13. Press the Stop button to begin charging the ink. This takes about 1 1/2 minutes.
When the
On light stops flashing and remains on, ink charging is finished.

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1 Answer

Replaced Yellow Cartridge, Red light on, close lid, not working,

Hi ...

I would suggest that you follow the below stesp to install the ink tank ..

. Ensure that the printer is on, and then open the Top Cover.
The Print Head Holder moves to the center.

Note: If the Top Cover is left open for more than 10 minutes, the Print Head Holder moves to the right. Close and reopen the Top Cover to return the holder to the center.
2. Open the Paper Output Tray.
Put your fingers in the notches in either side of the Paper Output Tray and pull down to open it, and then pull down the Inner Cover forward to open it.
3. Remove the ink tank whose lamp is flashing fast or is off.
Push the tab and remove the ink tank.
Do not touch the print head lock lever; remove only the ink tank.
Caution: Handle ink tanks carefully to avoid staining clothing or the surrounding area. Discard empty ink tanks according to the local laws and regulations regarding disposal of consumables.
Note: Be sure to replace ink tanks one by one when replacing more than one ink tank.
4. Prepare a replacement tank.
* Do not touch the electrical contacts on the ink tank. Doing so can cause the printer to malfunction or become unable to print.
Unpack the new ink tank and completely pull off the orange tape. Then, remove the film. Remove the orange protective cap from the bottom of the ink tank and discard it.
  • Be sure to remove the clear film from the ink tank in the exact order shown in step 4, as failure to follow this step may cause the ink to leak and stain your clothes and hands.
  • Do not squeeze the side of ink tanks as this may cause the ink to leak out and stain your clothes and hands.
  • Do not re-attach the protective cap once you have removed it.
  • Do not touch the open ink port once the protective cap is removed, as this may prevent the ink from being ejected properly.
  • Ink on the removed protective cap may stain your clothes and hands.
  • Ensure that all the orange tape has been peeled off along the perforation. If there remains a part of the orange tape, ink may not be output correctly.
5. Install the ink tank.
(1) Insert the ink tank into the Print Head.
(2) Press on the 'PUSH' mark on the ink tank until the ink tank snaps firmly into place.
(3) Ensure that the ink tank lamp lights red.
Important: Ensure that all the ink tanks are installed in the order directed by the label. The printer cannot be used unless all the ink tanks are installed.
6. Close the Inner Cover.
Note: Ensure that the Inner Cover is closed. Printing will not occur if the Inner Cover is open.

7. Close the Top Cover.
The Print Head Holder moves to the right. The ink tank installation process is now complete.
  • The ALARM lamp still flashes orange after the Top Cover is closed if an ink tank is not installed properly. Open the Top Cover and make sure that all the ink tanks are installed in the correct order directed on the label.
  • To maintain optimal print quality, use an ink tank within six months of first use.
  • Once an ink tank has been used, do not remove it from the printer and leave it out in the open. This will cause the ink tank to dry out and the printer may not operate properly when it is reinstalled.
  • Color ink consumption may occur even when black-and-white or gray scale printing is specified.
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  • When you start printing after replacing the ink tank, Print Head Cleaning is performed automatically. Do not perform any other operations until the Print Head Cleaning finishes. The POWER lamp flashes green during cleaning.
Don't forget to vote if this helps ... Cheers :)

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DRUM Q3964A FOR HP 2840

10.000x Supply error Description E-label can’t be read or print cartridge is not properly installed. Solution
  1. Reinstall print cartridge.
  2. Power cycle device.
  3. If the problem is not solved, replace the cartridge. NOTE: The software CD-ROM that came with the HP Color LaserJet 2820/2830/2840 all-one includes an animated tutorial that shows how to replace the print cartridges.
    1. Remove any media from the ADF, and then push the scanner-release button to open the scanner assembly.
    2. Open the cartridge door.
    3. Make sure that the correct print-cartridge slot is in the access position.
      • If the correct print-cartridge slot is not in the access position, close the top cover and the scanner assembly, and then press ROTATE CAROUSEL until the correct print-cartridge slot is in the correct position. Pinch together the two large blue tabs on the first cartridge, and then lift the cartridge straight up to remove it from the carousel.
    4. Remove the new print cartridge from its packaging, remove the orange cover from the print cartridge, and then pull the orange tab straight out to remove the sealing tape.
    5. Squeeze the blue release levers on the print cartridge, holding it with the roller facing you. Lower the cartridge straight down into the carousel until it is firmly in place.
      • To replace another cartridge, close the top cover and the scanner assembly, press ROTATE CAROUSEL , and then repeat the previous steps. NOTE: If a black print cartridge was replaced, then the device prompts to have a cleaning page ran, unless the device page count is less than 100 pages.
    6. Close the top cover, and then close the scanner assembly.

You may have to copy and paste the link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe

Nov 05, 2008 | HP LaserJet 2840 All-In-One Printer

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