Question about Brother MFC-9840CDW Laser Printer

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Won't detect black cartridge

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  • renee martin Nov 07, 2012

    This is a laser printer not inkjet. I don't see electrical contacts and there are no print head nozzles. Any idea if there may be a sensor that needs to be cleaned so the toner cartridge can be detected? This error came up after I replaced the yellow cartridge and cleaned the corona wires.

  • Chas Peters Nov 17, 2012

    I have the same problem,, First the cyan cartirage ten out and I replaced with a re-manfacturered one no problem, carts have a security sticker on the side, after a week it asked for black so I replaced the black as usual, but have tried 2 of them now and still says, "Black toner needs to be replaced" Next will have to open to see if gear is reset or the optical sensor needs to be covered, much like when doing a refill yourself.

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I have the same problem, first magenta said it needed to be replaced, then a couple of weeks later it asked for Black, I replaced the black the same way, and then also tried another new cartridge (both Re-manufactured) they have a security sticker on the side. Both didn't work so next I will try opening the side to see if the gear is reset or the optical sensor needs to be covered as when you add toner to an OEM cart. Strange that only the black seems to cause problems. The cost of toner and ink (for ink jets) is so cheap, yet if you figure it out by weight it costs much more than gold. Sometimes its just easier and more cost effictive to buy a new printer

Posted on Nov 17, 2012

  • Chas Peters Nov 17, 2012

    I have the same problem, first magenta said it needed to be replaced, then a couple of weeks later it asked for Black, I replaced the black the same way, and then also tried another new cartridge (both Re-manufactured) they have a security sticker on the side. Both didn't work so next I will try opening the side to see if the gear is reset or the optical sensor needs to be covered as when you add toner to an OEM cart. Strange that only the black seems to cause problems. The cost of toner and ink (for ink jets) is so cheap, yet if you figure it out by weight it costs much more than gold. Sometimes its just easier and more cost effective to buy a new printer

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->First check the cartridge compatibility.
->Are you sure not to touch the electrical contacts or print head nozzles when handling the printer cartridge.
->To clean the print head
->Update the printer driver if it is necessary..


If you need any kind of technical assistance on printer you can contact support cell at http://www.vtechsquad.com/

Posted on Nov 07, 2012

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In this error condition, the following light pattern displays on the product control panel and a message might display on the computer:
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Figure 69: The Power light is on and the Print Cartridge light blinksc02645167.gif
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