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  1. #1
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    Ricoh c751 error sc 685

    Hello,
    i need your help please.
    after a general power outage.
    my ricoh c751 doesn't want to start.
    on the screen I have the error sc 685.

    Thank you

  2. #2
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    Ricoh c751  error sc 685

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    Re: Ricoh c751 error sc 685

    SC685 C Power Supply Error 1
    PSU 2 failure.
    • PSU 2 harness disconnected or broken
    • PSU 2 defective
    • Interlock relay board defective

    Most probably your Power Supply 2 is fried...

    You could check your fuses, but failing that I'd recommend calling a tech (I'd recommend that anyway, but you seem like you want to give it a try, so...)
    ' "But the salesman said . . ." The salesman's an asshole!'
    Mascan42

    'You will always find some Eskimo ready to instruct the Congolese on how to cope with heat waves.'

    Ibid

    I'm just an ex-tech lurking around and spreading disinformation!

  3. #3
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    Re: Ricoh c751 error sc 685

    thank you for your reply.
    i have two ricoh c751,
    I completely changed the two board ( PSU 2 and relay board ).
    but the problem is still available
    Screenshot_20200707-221440_Drive.jpg

    Quote Originally Posted by mrwho View Post
    SC685 C Power Supply Error 1
    PSU 2 failure.
    • PSU 2 harness disconnected or broken
    • PSU 2 defective
    • Interlock relay board defective

    Most probably your Power Supply 2 is fried...

    You could check your fuses, but failing that I'd recommend calling a tech (I'd recommend that anyway, but you seem like you want to give it a try, so...)

  4. #4
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    Ricoh c751  error sc 685

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    Re: Ricoh c751 error sc 685

    It's possible that the other PSU is also blown - hell, with a power outage, it's possible that any other electrical component is out of order.

    I'd start by double-checking all the PSU2 and relay board connections, and then I'd try to replace the PSU1 also.

    Failing that, it's uphill from there - from the Goose Guide, on another not-so-dissimilar model, they replaced both PSUs plus the IOB.

    Good luck!
    ' "But the salesman said . . ." The salesman's an asshole!'
    Mascan42

    'You will always find some Eskimo ready to instruct the Congolese on how to cope with heat waves.'

    Ibid

    I'm just an ex-tech lurking around and spreading disinformation!

  5. #5
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    Ricoh c751  error sc 685

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    Re: Ricoh c751 error sc 685

    You may need to get out your test meter and start checking voltages. Once you find what voltage is missing check the point to point to see where that voltage goes to. I had a paper feed motor with an internal short to ground take down the 24V supply on a Pro 1357EX once.

  6. #6
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    Re: Ricoh c751 error sc 685

    Thank you for your answers 🙏🙏
    the second machine works well.
    what's weird is i changed the PSU 2 + IOB + BCU but nothing.
    on the other hand I did not check PSU 1. I will do it tomorrow and I will give you a return.

    Thank you

  7. #7
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    Ricoh c751  error sc 685


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    Re: Ricoh c751 error sc 685

    Once you get it fixed, get surge suppressors on those machines.

  8. #8
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    Re: Ricoh c751 error sc 685

    it's really weird.
    even change the PSU 1.the problem still remains.😔
    ( the screen stays black and I have to put a lamp to see the error - sc 685- ).🤔🤔

  9. #9
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    Ricoh c751  error sc 685

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    Re: Ricoh c751 error sc 685

    If the screen backlit is off and you can still see the screen error, then there's something else afoot - in older models we'd talk about the bicu and the laser motor (although it would be a different code, if memory serves me right).

    You would think that's an important detail to tell us...
    ' "But the salesman said . . ." The salesman's an asshole!'
    Mascan42

    'You will always find some Eskimo ready to instruct the Congolese on how to cope with heat waves.'

    Ibid

    I'm just an ex-tech lurking around and spreading disinformation!

  10. #10
    Major Asshole! 2,500+ Posts
    Ricoh c751  error sc 685

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    Re: Ricoh c751 error sc 685

    I never had that problem on that model before (I really don't have any of those machines under my umbrella, tbh), so I did a little research.

    And couldn't find anything besides what was already said - meaning that, unless someone else can share their experiences, you'll need to start swapping boards one by one until you find the culprit.
    ' "But the salesman said . . ." The salesman's an asshole!'
    Mascan42

    'You will always find some Eskimo ready to instruct the Congolese on how to cope with heat waves.'

    Ibid

    I'm just an ex-tech lurking around and spreading disinformation!

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