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Aficio sp240dn blackout. Does Anybody know which is the problem? Which component could i change on the power unit?

The display showed a blinking sc670 error (power unit or engine fault) then faded down. Blackout. Now, switching on the power, the power unit buzzes alternately, like working in a protection mode (some short cirquit? The fuse is ok).

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  • Kirk Jun 17, 2018

    thanks JonSnell, i misured the impedance: both 8ohm, so they are ok, as you imagined.
    My next step is, as you suggest, to misure the output. i think, at this point, the fault could be the pricipal converter.

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  • The Master
  • 28,461 Answers

Firstly you will need to fault find this power supply, then the faulty components will be obvious.
There is no 'stock fault' repair.

Posted on Jun 16, 2018

Testimonial: "How don't know exactly how to fault find. The power supply change a 240vac in 24vcc. May you suggest anything?"

  • 7 more comments 
  • JonSnell Electronic
    JonSnell Electronic Jun 16, 2018

    Working on power supplies is a skilled job and safety is foremost. Take it to a TV repair shop, they may be able to fix it for you.

  • Kirk Jun 16, 2018

    Thanks a lot. I need suggestions. I could take the copyer to a technician too. Not helpful.

  • JonSnell Electronic
    JonSnell Electronic Jun 16, 2018

    You have not got the training or expertise to carry out a repair on a power supply that is a safety item and dangerous to work on. Replace the power supply.

  • JonSnell Electronic
    JonSnell Electronic Jun 16, 2018

    All I am willing to suggest is that a diode on the cold side of the transformer may be short circuit. Check the diodes.

  • Kirk Jun 16, 2018

    I had already repaired high voltage units. But i haven't ever fault find an Electronic power unit. Thanks a lot :)

  • Kirk Jun 16, 2018

    I checked all the diodes. Ok. There are two thermistores 8ohm which make buzz the tester.
    Are they fused?

  • JonSnell Electronic
    JonSnell Electronic Jun 17, 2018

    They sound OK as they are low resistance when cold and high resistance when hot. Do you get 24v from the output without the unit plugged into the copier? if you do, look elsewhere for your fault on the copier itself.

  • Kirk Jun 17, 2018

    thanks JonSnell, i misured the impedance: both 8ohm, so they are ok, as you imagined.
    My next step is, as you suggest, to misure the output. i think, at this point, the fault could be the pricipal converter.

  • JonSnell Electronic
    JonSnell Electronic Jun 17, 2018

    The switching transistor, if not working, normally goes short circuit with a spectacular display of damaged components around it. Otherwise, no drive to the output FET maybe.

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SOURCE: Ricoh Aficio 2232c printer without power. Need to

The main fuse is close to where the cord plugs into the machine. You can follow the wires, (black white and green) to an inline fuse or the main power board.

Posted on Sep 22, 2009

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