Issue with UV lights shutting off intermittently

Discussion in 'Heidelberg Printing Presses' started by Lavoie, Apr 18, 2021.

  1. Lavoie

    Lavoie New Member

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    Anyone ever see this before? 2009 XL-105 10 color with coater and perfector. The EOP lights shut off for several seconds with no warning or fault, then they come right back up.
     
  2. Beguin

    Beguin Senior Member

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    please could you take some pictures so that we can appreciate the problem thanks
     
  3. mrheidelberg

    mrheidelberg Senior Member

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    How is the op going to take a photo of end of press UV lights going randomly on & off :(
     
  4. mrheidelberg

    mrheidelberg Senior Member

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    Could be a sensor or a bad contact somewhere.
    Is it possible to put new / replacement lights in & see what happens then.
     
  5. CHOCK

    CHOCK Senior Member

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    Hi sir:

    Will be a good idea, take a Pic, and send it, in order where is located te EOP lights.

    1) However,you must test a) The voltage in according with his schematic diagrams for+24Vdc or +22Vdc,

    2) Look for Dry or colder joint solder.

    3) Loose wires , or corroded, doing bad contacts.

    4) Lights defectives.
     
  6. Waqas_zahid

    Waqas_zahid Senior Member

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    Hi,
    On the XL105 on the operator side there are small flaps on each UV lamps that you slide to one side and that lets you look inside the cassette whether if the lamps are ON or OFF, I am suspecting the shutters close and the lamps themselves do not go off otherwise they would not come back again, the UV unit probably thinks it is out of production as you see no errors, at the moment I am not sure how the UV cabinet know that it is in production, I think may be it is worth looking at the speed green speed sensor device inside the cabinet.
     
  7. Waqas_zahid

    Waqas_zahid Senior Member

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    Or may be there are signals exchanged between the UV cabinet and the SAM board inside the main cabinet, I will probably look up the wiring diagram in the morning tomorrow to make a little sense out of this
     
  8. Waqas_zahid

    Waqas_zahid Senior Member

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    Hi,

    Have a look at the below, I am not sure if this is the exact problem but is worth investigating. This is from the UV cabinet diagram, the SAM represents the SAM board inside the machine main cabinet.

    upload_2021-4-20_10-42-38.png

    If you try to trace the same signals inside the machine main cabinet below is what it looks like.

    upload_2021-4-20_10-44-47.png

    I think this signal might be intermittent in your case resulting in the problem you see, pls have an electrician check this make sure he is measuring this while the UV is in production.
     
  9. CHOCK

    CHOCK Senior Member

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    Hi sir:
    Will be a good idea, take a Pic, and send it, in order where is located te EOP lights.

    1) However,you must test a) The voltage in according with his schematic diagrams for+24Vdc or +22Vdc,

    2) Look for Dry or colder joint solder.

    3) Loose wires , or corroded, doing bad contacts.

    4) Lights defectives
     
  10. Waqas_zahid

    Waqas_zahid Senior Member

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    Any update on the problem? has it been resolved?
     
  11. mrheidelberg

    mrheidelberg Senior Member

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    Op has not been back on
     
  12. Lavoie

    Lavoie New Member

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    My apologies folks. My schedule is quite hectic. I appreciate all of your input immensely. The last thing we tried was replacing a CAN communication module. So far (3 days), the issue has not returned. Had to get a tech in for this one. Ended up just throwing parts at it.
     

  13. Waqas_zahid

    Waqas_zahid Senior Member

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    Thanks for coming back with the update Lavoie, have a good weekend.
     
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