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  1. #1
    Senior Tech 250+ Posts driving lots of miles's Avatar
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    Brother MFC-L6900DW locked up

    I have a MFC-L6900DW that is locked up. The unit is 10 months old, and when plugged in, will not come to ready. When I power it up the Home button lights, then the back and cancel buttons light within 1 second, so all three lights are on. Touching any of the buttons does nothing and the power on/off button does not work. The only way to power it on or off is with the power cord. There are no sounds no fans not anything. I swapped the power supply board from a similar machine and it made no difference. I am thinking main board or control panel. I am open to any suggestions or ideas.

  2. #2
    Service Manager 5,000+ Posts tsbservice's Avatar
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    Re: Brother MFC-L6900DW locked up

    Never had control panels bad. Main boards fails due to failed NIC ports.
    Otherwise they are solid. Do you unplug Ethernet cable when problem arrives?
    Had a few ones where corrupt job causes printer restarted itself.
    A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.

    Blessed are they who can laugh at themselves, for they shall never cease to be amused.

    I don't reply to private messages from end users.

  3. #3
    Senior Tech 250+ Posts mjunkaged's Avatar
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    Re: Brother MFC-L6900DW locked up

    Brother service may have updated firmware for the machine, and even their customer service phone is not bad. If you know an authorized Brother tech. or Dealer they can hook you up. Worth a try every time on Brother brand fax, not sure about their newer stuff, but likely the same!! i wonder if they still have a bunch of beeping noises to let you know how firmware update is progressing??
    But before all that, the basics: Did you pull out all toners/drums/peripherals one at a time to see if it made the problem go away (especially if NON OEM supplies)?
    Some models have a removable fuser, if not seated, will turn it into a stupid toaster as you describe.

  4. #4
    Senior Tech 250+ Posts mjunkaged's Avatar
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  5. #5
    Service Manager 10,000+ Posts
    Brother MFC-L6900DW locked up

    Phil B.'s Avatar
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    Re: Brother MFC-L6900DW locked up

    Quote Originally Posted by mjunkaged View Post
    Brother service may have updated firmware for the machine, and even their customer service phone is not bad. If you know an authorized Brother tech. or Dealer they can hook you up. Worth a try every time on Brother brand fax, not sure about their newer stuff, but likely the same!! i wonder if they still have a bunch of beeping noises to let you know how firmware update is progressing??
    But before all that, the basics: Did you pull out all toners/drums/peripherals one at a time to see if it made the problem go away (especially if NON OEM supplies)?
    Some models have a removable fuser, if not seated, will turn it into a stupid toaster as you describe.
    RE: YES beeping during updates and some error codes once in SM...

  6. #6
    Service Manager 10,000+ Posts
    Brother MFC-L6900DW locked up

    Phil B.'s Avatar
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    Re: Brother MFC-L6900DW locked up

    Quote Originally Posted by driving lots of miles View Post
    I have a MFC-L6900DW that is locked up. The unit is 10 months old, and when plugged in, will not come to ready. When I power it up the Home button lights, then the back and cancel buttons light within 1 second, so all three lights are on. Touching any of the buttons does nothing and the power on/off button does not work. The only way to power it on or off is with the power cord. There are no sounds no fans not anything. I swapped the power supply board from a similar machine and it made no difference. I am thinking main board or control panel. I am open to any suggestions or ideas.
    SO.. a blank screen?
    you replaced the LVPS.. did it have multiple errors? could need it reset.
    the main bds on those series were a lil flaky. but you aren't doing warranty work.. might not be worth it..
    like mentioned .. pull n reseat all consumables... check sensor flags on fuser when reseating..

    do you have the manuals?

    1st flash with the latest FW.

  7. #7
    Senior Tech 250+ Posts mjunkaged's Avatar
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    Re: Brother MFC-L6900DW locked up

    Quote Originally Posted by Phil B. View Post
    SO.. a blank screen?
    you replaced the LVPS.. did it have multiple errors? could need it reset.
    the main bds on those series were a lil flaky. but you aren't doing warranty work.. might not be worth it..
    like mentioned .. pull n reseat all consumables... check sensor flags on fuser when reseating..

    do you have the manuals?

    1st flash with the latest FW.
    Brother and Samsung......the 'fix it with a firmware update' undisputed King & Queen! You decide who's who. I go w/Brother being KING as they trained me on a consumer fax in USA in 1988!!!!

  8. #8
    Service Manager 10,000+ Posts
    Brother MFC-L6900DW locked up

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    Re: Brother MFC-L6900DW locked up

    Quote Originally Posted by mjunkaged View Post
    Brother and Samsung......the 'fix it with a firmware update' undisputed King & Queen! You decide who's who. I go w/Brother being KING as they trained me on a consumer fax in USA in 1988!!!!
    Brother KING ... HP Queen ... SamSUX court jester

    brother was on top with releases

    hp only IF 'nuff people BITCHED

    samSUXs Who Da Fuck Cares!?

  9. #9
    Senior Tech 250+ Posts mjunkaged's Avatar
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    Re: Brother MFC-L6900DW locked up

    Quote Originally Posted by Phil B. View Post
    Brother KING ... HP Queen ... SamSUX court jester

    brother was on top with releases

    hp only IF 'nuff people BITCHED

    samSUXs Who Da Fuck Cares!?
    Spoken like someone who has tasted the difference! Forgot about HP!

  10. #10
    Service Manager 10,000+ Posts
    Brother MFC-L6900DW locked up

    Phil B.'s Avatar
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    Re: Brother MFC-L6900DW locked up

    Quote Originally Posted by mjunkaged View Post
    Spoken like someone who has tasted the difference! Forgot about HP!
    31 yrs in the industry.. yup i've had my taste of it... pooooo taste terrible!

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