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

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Back cover alert keeps flashing

I have opened the back door to see what the problem might be. there are two blue tabs and a yellow triangle sticker. I don't understand what the other repair folks are talking about---photo switches ---where are they? what do they look like?  This all started because of a persistent black stripe on my faxes and when I copy. I also cannot fix that. I have replaced the drum once this year after getting 3 years out of the original. Do I need a new drum? I can't figure out what I am supposed to clean.

 

thanks

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  • 45 Answers

The black lines sound like it may be a contaminated fuser roller. Surface of one of these rollers is a Teflon coat. In time this wears away and the end result is toner build up that eventually transfers to the paper.A Photo Sensor is a switch that monitors the path of the paper thru the cycle of paper pick up all the way to exit of the paper from the out put. These switches open and close. when there is a paper jam and not all of the paper is removed fragments of the removed paper can be left behind. this can actually trigger an error of door open/close cover. The mentioned "two blue tabs" are the release point of the fuser upper roller that you toggle to move the roller up or release the downward pressure from the bottom roller. These are used to clear a paper jam . If you have access to a small flash light, look carefully in that area for fragments of paper. The "yellow triangle " is part of the warning label of the fuser cover stating that this is an extremely hot in temperature piece and to handle with care or touch with the power off and wait to cool prior to any inspection,. If there is no signs of fragments of paper in the area, a "sensor" flag might be stuck and blocking the photo sensor's light path, triggering the " Back Cover open" error.....hope this helps,Steve

Posted on Jan 28, 2008

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Triangle with exclamation mark is flashing orange. What's the problem with it?


This usually indicates one of the following issues have occurred. Perform the following in the order provided to troubleshoot and resolve the issue.
1. Insufficient power. Disconnect the power cord from any surge protectors or power strips and plug the unit directly into an electrical wall outlet.
2. There is a paper jam in the printer.
3. The top cover is open. Open the top cover, reseat the print cartridge, and close the top cover, making certain it is shut properly.
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A. Pull the tray out of the printer and remove any paper.
B. Move the blue side width guide outward to match the paper size that is being loaded. Locate the blue guide pointer on the left side of the tray. If using a letter-size (8.5 by 11 inch) paper, match the guide point with the LTR/LGL engraving located on the bottom, left-side of the lift plate.
C. Locate the blue tab on the rear paper-length guide. Locate the triangle-shaped pointer in the middle-right on the bottom of the tray. Press on the blue tab and adjust it so that the triangle-shaped pointer matches the paper size that is being loaded. If using letter-size (8.5 by 11 inch) paper, match the triangle-shaped pointer with the LTR engraving on the bottom of the tray.
D. Place the paper in the tray and make sure that it is flat at all four corners. Keep the paper below the height down arrows on the paper-length guide in the rear of the tray.
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5. The tray 2 paper level indicator is stuck.
6. If the printer comes back to a Ready state, print a Self-Test/Configuration page. If the printer is not in a Ready state, proceed to step 7.
A. Verify the printer is in a Ready state. (The green LED next to the U-shaped icon is on steady and no other lights are on.)
B. Press down on the green GO button until the orange Attention light comes on (approximately 5 seconds), and then immediately release the GO button. The green GO button will begin to blink and a Self-Test/Configuration page will print.
7. If the attention light is still on, perform a cold reset. A cold reset, sets most, but not all, default variables stored in NVRAM back to the factory default values. It typically does not reset the page count, paper tray sizes, localization language, or formatter number. Complete the following to perform a cold reset.
A. Turn the printer off.
B. Press and hold down the green GO button.
C. Turn the printer on and continue to hold the green GO button for at least 5 seconds, but not longer than 15 seconds. During the process, the Attention LED will turn on.
D. Release the GO button.
NOTE: If both the Attention light and the Ready LEDs turn on before the GO button is released, the cold reset procedure must be started over at step 1.
E. The printer LEDs begin cycling. The cold reset process runs until completion and the printer returns to the Ready state.

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I found just doing this one simple thing sorted the problem.

First take off the front cover. Pull the tabs on the side. Pull out the big toner and cartridge. Do you see the blue tab on the top shaped like an arrow/triangle? Slide the tab from right to left - reinsert toner close door.
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Toner is not sealed on paper. Images rub off!


Open the top cover of the printer. When you look toward the back you will see two yellow felt stickers with a black triangle on them. On either side you will see two gray or green tabs. If they are sitting up, pull them down towards you so that you can see the pictures of the envelope on top of them.

Try to print. If you have been printing like that for a while then the back of your pages my have spots on them for the next few prints.

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Flashing light


Here is what HP has on the subject of the triangle light flashing:
c00028322.gif 1 - Attention Light 2 - Ready Light 3 - Go Light Figure 2: Printer light key c00028323.gif 1 - Symbol for light off 2 - Symbol for light on 3 - Symbol for light blinking
c00028328.gif Door open, media out, no print cartridge, or media jam

The printer is in an error state that requires operator intervention or help. Check the following:
  • The print cartridge door is completely closed.
  • Media is loaded.
  • The print cartridge is correctly installed in the printer.
  • There is no media jam.

Figure 8: Paper jam c00028328.gif 13.JJ.NT JAM IN TRAY 1

13.JJ.NT JAM IN TRAY X

The Attention LED is blinking. Check paper loading then open and close top cover.

When there is a jam in tray 1, verify the paper is loaded correctly, open and close the top cover. Pressing GO is ignored.

When there is a jam in tray X, verify the paper is loaded correctly, open and close the top cover. Pressing GO is ignored. These are the error explanations for just the flashing triangle light, there are many more, but none for just the flashing triangle.

If the light pattern is different let me know (other lights on as well)
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Yellow light


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  1. Insufficient power. Disconnect the power cord from any surge protectors or power strips and plug the unit directly into an electrical wall outlet.
  2. There is a paper jam in the printer.
  3. The top cover is open. Open the top cover, reseat the print cartridge, and close the top cover, making certain it is shut properly.
  4. No paper was loaded in tray 2 or the tray was not loaded properly causing a mispick. Perform the following steps to load tray 2.
    1. Pull the tray out of the printer and remove any paper.
    2. Move the blue side width guide outward to match the paper size that is being loaded. Locate the blue guide pointer on the left side of the tray. If using a letter-size (8.5 by 11 inch) paper, match the guide point with the LTR/LGL engraving located on the bottom, left-side of the lift plate.
    3. Locate the blue tab on the rear paper-length guide. Locate the triangle-shaped pointer in the middle-right on the bottom of the tray. Press on the blue tab and adjust it so that the triangle-shaped pointer matches the paper size that is being loaded. If using letter-size (8.5 by 11 inch) paper, match the triangle-shaped pointer with the LTR engraving on the bottom of the tray.
    4. Place the paper in the tray and make sure that it is flat at all four corners. Keep the paper below the height down arrows on the paper-length guide in the rear of the tray.
    5. Slide the tray back in the printer.
  5. The tray 2 paper level indicator is stuck. (http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00276974).
  6. If the printer comes back to a Ready state, print a Self-Test/Configuration page. If the printer is not in a Ready state, proceed to step 7.
    1. Verify the printer is in a Ready state. (The green LED next to the U-shaped icon is on steady and no other lights are on.)
    2. Press down on the green GO button until the orange Attention light comes on (approximately 5 seconds), and then immediately release the GO button. The green GO button will begin to blink and a Self-Test/Configuration page will print.
  7. If the attention light is still on, perform a cold reset. A cold reset, sets most, but not all, default variables stored in NVRAM back to the factory default values. It typically does not reset the page count, paper tray sizes, localization language, or formatter number. Complete the following to perform a cold reset.
    1. Turn the printer off.
    2. Press and hold down the green GO button.
    3. Turn the printer on and continue to hold the green GO button for at least 5 seconds, but not longer than 15 seconds. During the process, the Attention LED will turn on.
    4. Release the GO button.
      NOTE: If both the Attention light and the Ready LEDs turn on before the GO button is released, the cold reset procedure must be started over at step 1.
    5. The printer LEDs begin cycling. The cold reset process runs until completion and the printer returns to the Ready state.
  8. If the issue persists, please contact Hewlett-Packard's Customer Care phone center for further assistance. at http://www.hp.com/support.

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Problem with the printer drum?


Sounds like the toner isn't sticking to the paper.

Open the top cover of the printer. You will see two yellow felt stickers with a black triangle on them. On either side of those stickers you will see two gray or green tabs. If the tabs are sitting up pull them down towards you so you can see the picture of the envelope on top. Close the cover and try to print.

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