Emergency Fault on SM-74. Please help.

Discussion in 'Heidelberg Printing Presses' started by youngBOSS, Jan 14, 2022.

  1. youngBOSS

    youngBOSS Member

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    Hello gentlemen. I am currently trying to resolve a fault that I have not found the cause yet.
    An SM-74 5- color machine is showing an EMERGENCY STOP SIGN on the MID and ERROR 15 showing there’s a fault in the main cabinet.

    I have done the following to resolve the fault but haven’t been successful:
    1. I replaced the SEK board.
    2. Exchanged the EAK boards.
    3. Plugged and unplugged EAKs and NT power Cards.
    3. Checked for missing voltages especially dc 150v control voltage.

    Please. Can you think of anything that may cause this fault? I really will appreciate your input.
     

    Attached Files:

  2. Adil

    Adil Senior Member

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    Donnez moi une image des messages erreur ( le panneau d arrêt d urgence sur la MID et l armoire principale )
     
  3. youngBOSS

    youngBOSS Member

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    I have added the image of the error now.
     
  4. Adil

    Adil Senior Member

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    Est ce que la machine démarre ou bien elle est bloqué depuis la mise en tension ??
     
  5. Adil

    Adil Senior Member

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    Pouvez vous me d'écrire le problème que vous avez eu ?
     
  6. youngBOSS

    youngBOSS Member

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    Sorry. I can’t understand your language. Would be kind to talk in English?
     
  7. Adil

    Adil Senior Member

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    Does the machine start or has it been blocked since powering up?
    Can you write me the problem you had
     
  8. youngBOSS

    youngBOSS Member

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    The error appears immediately it is powered up so the machine is not running.
     
  9. Adil

    Adil Senior Member

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    Take a photo of init-test in the dignostic menu for me
     
  10. ashok kumar

    ashok kumar Senior Member

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    Hi
    Pls check grm 120 safety input.
    On the grm120 there is one small piggy board which have 2 wire remove from piggy board and short the same for testing purpose only then switch on.
    Do not run the machine if error gone.
    Pls confirm.
    If your error gone the pls get check grm 120.

    Or these wire are looped via sta box. Check with wiring diagram.
    And measure voltage with respect of -1 .. .
    Signal from grm>sta> 15fem pin... Check as per wiring. Mesure voltage there also.
     
  11. youngBOSS

    youngBOSS Member

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    When machine is switched on. The EAKs are Flashing under the Initial Test.
    I replaced the card on GRM120, but it didn’t work. I shorted the red and black cables as well but the error is still there.
     
  12. youngBOSS

    youngBOSS Member

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    This is the image of the Initial Test menu.
     

    Attached Files:

  13. Waqas_zahid

    Waqas_zahid Senior Member

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    In newer machines we have a board for external input to the main cabinet called the SEM, for your particular machine if I remember correctly there should be a similar board at the back of the main cabinet inside the small box, if you see in the wiring diagram the emergency signals goes through there also, Ashok was right in pointing out the GRM 120 the signal goes through that board as well and finally goes to the main cabinet EAK.
     
  14. youngBOSS

    youngBOSS Member

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    You gentlemen are right. I checked for power(dc24v) at input 34 on 15FEM with reference to -1 and it was off. When I connect power from +1 to input 34 of 15FEM, the error goes off. Surely it goes through the STA. But the STA box is not at the back of main cabinet.
    Am now trying to locate it. Do you have any idea of where else STA box may be on SM74? This is a 1996 5 color model.
     
  15. Adil

    Adil Senior Member

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    On the sm74 and sm52 the STA is located on the service side under the feeder desk
     
  16. Adil

    Adil Senior Member

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    Do this diagnosis and answer me afterwards:
    On the relay output SAM card, measure the 24v dc voltage between C10 and A10 then the 230 v AC voltage between 56/57 and between 58/59
    On the SEM card measure the 24 v dc voltage between p+ and p- then a 24 v dc voltage Between E+/E1 and between E8 / E+8
    If you have done work on the dryer you can confirm it to me
     
  17. youngBOSS

    youngBOSS Member

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    Okay. Thanks very much. I will get back to you on that soon.
     
  18. youngBOSS

    youngBOSS Member

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    Hello gentlemen.
    The fault has been resolved, and I really appreciate your recommendations that made it possible. This is my findings.
    On the Interface Input Module (SEM), there’s an ac 21volts power coming from 15x4: 212&N4. This voltage is rectified to power the SEM to enable it switch out dc24v(+1) to the various outputs(E1-E8).

    A small fixed capacitor on the SEM is shorted causing the control voltage of the SEM to diminish. Once this capacitor was changed, the error cleared. Thanks very much.
     
  19. Adil

    Adil Senior Member

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    Bon travail
     

  20. youngBOSS

    youngBOSS Member

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