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  1. #1
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    BH450i Not Powering ON

    Hi everyone!

    Earlier the MFP BH450i was having Paper Jam issue at the Paper Registration Sensor. So, cleaned the Paper Registration Sensor and refitted it. Switched ON the machine, but no response! Properly checked all the Harnesses & Connectors. But same issue. Tick sound comes from the DC Power Supply while switching ON.

    Finally, when I disconnected the CN7 of the DC Power Supply which is connected to the CN2E of the BASE Board, the MFP starts initializing. But Trouble Code E-6756 and Error Code E6-1 comes after some time.

    So, I need your valuable feedback & tricks to resolve the issue and its Root Cause.

    Photos are attached herewith.
    Attached Images Attached Images

  2. #2
    Certified Konica Expert 2,500+ Posts
    BH450i Not Powering ON

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    Re: BH450i Not Powering ON

    last time i had anything even close it was the CPU board and i replaced the storage board at same time.
    We know a thing or two because we've seen a thing or two.
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  3. #3
    Service Manager 5,000+ Posts tsbservice's Avatar
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    Re: BH450i Not Powering ON

    Quote Originally Posted by subhashck View Post
    Hi everyone!

    Earlier the MFP BH450i was having Paper Jam issue at the Paper Registration Sensor. So, cleaned the Paper Registration Sensor and refitted it. Switched ON the machine, but no response! Properly checked all the Harnesses & Connectors. But same issue. Tick sound comes from the DC Power Supply while switching ON.

    Finally, when I disconnected the CN7 of the DC Power Supply which is connected to the CN2E of the BASE Board, the MFP starts initializing. But Trouble Code E-6756 and Error Code E6-1 comes after some time.

    So, I need your valuable feedback & tricks to resolve the issue and its Root Cause.

    Photos are attached herewith.
    I'm not saying that is the root cause but those i series must be serviced unplugged from wall outlet otherwise they keep some voltages even power switch off. Maybe try another base board.
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  4. #4
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    Re: BH450i Not Powering ON

    Error
    C6756 at power on and scanner light working fine.


    Root Cause
    New CCD/CIS installed without updating firmware


    Workaround/Fix
    Install firmware based on models outlined in attached bulletin 12525.

    C450i/C360i/C300i/C250i/C750i/C650i/C550i/450i/360i/300i/750i/650i/550i✔ - G00-G4 or later

  5. #5
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    Re: BH450i Not Powering ON

    Quote Originally Posted by tsbservice View Post
    I'm not saying that is the root cause but those i series must be serviced unplugged from wall outlet otherwise they keep some voltages even power switch off. Maybe try another base board.
    Thanks for your feedback.

    It powers ON when the CN7 of DC Power Supply is disconnected which is connected to CN2E of BASEB.

    Wiring Diagram attached. Any clue from the Diagram?
    Attached Images Attached Images

  6. #6
    Service Manager 1,000+ Posts Gift's Avatar
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    Re: BH450i Not Powering ON

    Quote Originally Posted by subhashck View Post
    Thanks for your feedback.

    It powers ON when the CN7 of DC Power Supply is disconnected which is connected to CN2E of BASEB.

    Wiring Diagram attached. Any clue from the Diagram?
    What happened if you leave CN7 connected but disconnet other conenctors/harnesses from base board step by step.

  7. #7
    Senior Tech 100+ Posts
    BH450i Not Powering ON


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    Re: BH450i Not Powering ON

    Quote Originally Posted by Gift View Post
    What happened if you leave CN7 connected but disconnet other conenctors/harnesses from base board step by step.
    Pinched/Cut wire to the registration unit? Only time I've heard a click and black has been a short to ground. Unplugging power to the Front board like you did would get rid of that short. Plug the front board back in and unplug the connectors from the front board to registration.

    Once you have the front board powered but the registration unplugged see if it boots. Ideally it does, with a "jam" from the reg sensor or a different error related to the reg. You can also try booting with the doors open. That stops a lot of activity to the boards, so you might fully boot up but once the doors close it shorts and powers down.

  8. #8
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    Re: BH450i Not Powering ON

    Quote Originally Posted by tmmdmmm View Post
    Pinched/Cut wire to the registration unit? Only time I've heard a click and black has been a short to ground. Unplugging power to the Front board like you did would get rid of that short. Plug the front board back in and unplug the connectors from the front board to registration.

    Once you have the front board powered but the registration unplugged see if it boots. Ideally it does, with a "jam" from the reg sensor or a different error related to the reg. You can also try booting with the doors open. That stops a lot of activity to the boards, so you might fully boot up but once the doors close it shorts and powers down.
    Thanks for the trick. Will check and update.

  9. #9
    Field Supervisor 500+ Posts
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    Re: BH450i Not Powering ON

    Had this in a school that had been nuked by the power company ( apparently they connected the wrong phases up after repairs and ended up frying an entire village)!

    It did exactly what you describe in that I could pull off connectors and it would part boot, then error.

    That one turned out to be the power supply board.

    This was a C360i btw.

    Might be worth taking one with you.

  10. #10
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    Re: BH450i Not Powering ON

    Replaced the BASEB, CPUB and DC Power Supply. But problem not resolved. Any idea?

    Thanks in advance!

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