Start-up problem on Wohlenberg MCS 2 TV

Discussion in 'Cutters and Trimmers' started by Hamed Ndiaye, Sep 19, 2022.

  1. Hamed Ndiaye

    Hamed Ndiaye New Member

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    Good evening everyone, I'm new to this forum. My problem is that when I start the cutter, nothing works, neither the screen lights up, nor the K0 and K22 contactors activate, apart from a light. With a button lit on the front panel, all fuses are OK.. Need help please...
     
  2. CHOCK

    CHOCK Senior Member

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    Hi sir;
    Please review the Circuit breaker F33 and reset it, AFTER Q1 main switch( test main switch, for loose wires, or dirty contacts, or worn or defective)!!!

    Let me know.sincerely


     
  3. Hamed Ndiaye

    Hamed Ndiaye New Member

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    Hello, thank you for your advice, all of this is correct, the problem is that the K22 does not activate as soon as Q1 closes, and this is possible if the K216 relay is OK, but this one comes from UCP... In addition my screen does not even turn on, thank you for your cooperation
     
  4. Hamed Ndiaye

    Hamed Ndiaye New Member

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    Lorsque je démarre, il y a seulement ce voyant qui s'allume sur le tableau de commande et 05 autres petits voyants sur la carte CPU. J'ai vérifié au la tension ĎC de la carte, j'ai 12.6V et 5.2V bien présent. Voir ci-joint les photos, merci de votre aide 20220924_223202.jpg 20220924_181925.jpg
     
  5. CHOCK

    CHOCK Senior Member

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    Hi sir;
    I really do NOT understand very well, what is the situation of his machine, first you say; ¨thank you for your advice, all of this is correct¨

    You must test very well;

    1) the Power Supply, Input of Vac in tolerance around 10% up or down.

    2) the Non regulated Power Vdc, in tolerance around 10% up or down.

    3) The Regulated Power Vdc, in tolerance aroun 0.7% !!!!! Very critical up or down... like + 5vdc

    4) you are indicating that in the Display , you have a small light, but do NOT see it, if the CRT is ON, if that situation is there NO display in CRT, please you problem, with the issue in the 3 stesps mentioned before, Of course,, must test too , the +15Vdc, +5.2Vdc?? Not good and +12.6Faulty.. and possible flyback of CRT.

    Let me know, follow his schematic diagrams electrical.

     

  6. Hamed Ndiaye

    Hamed Ndiaye New Member

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    ok I understand, I'll get back to you as soon as I have checked all the points you have indicated.. thank you
     
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