Problem with laser unit on PU 1 - Heidelberg QM 46-4 plus

Discussion in 'DI Presses' started by tmpord, Mar 9, 2016.

  1. tmpord

    tmpord Member

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    Location:
    Thessaloniki Greece
    Hello
    I have a problem with the laser unit on PU1
    The glass that it protect the lasers from dust have broken (cycle on picture 1) and after that the laser diode near to the point that the glass broke didnt work propetly.
    So i decide to take off the laser unit so i see what can i do with that dammage.
    I changed position in the laser diode which has had the problem (yellow arrow on picture 1) with that in the one end and changed also the laser diode near to that has the problem with the laser diode in the other end of the unit.
    Βut when I put the unit into place and tried to image on a part of the plate from one end to the other, the result is that shown in Figure 2. It appeared all the work on the left side of the plate
    I want aks at first if the glass that protect the diodes on the unit it is easy to change it and which are the certifications that glass must have and second if you have any idea why when i try to image it make all the jobe on the left side of the plate.
    And i have changed again the laser diodes that i have changed them before in the position they had before the problem but again it does the same incorrect mapping.
    please help
     

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  2. augustov

    augustov Senior Member

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    You need recalibrate the laser unit.. this have a distance from the plate cilinder and glass, is necesarry with a special tool very very fine... you can remplace the glass (is no glass, is a crytal very clean) with the same spesor, but, its too dificult... when the laser is no close to correctly dinstance, can burn very well because is out the focus...
     
  3. Paul Cavanaugh

    Paul Cavanaugh Senior Member

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    The laser carriage focal plane is 9.144 mm from the plate. It is important this distance is set. Also the glass, as mentioned by Agustov is indeed crystal. It also has a seven layer coating on it like that of a lens on a camera. I have never seen one successfully replaced in the field. My guess is there are many used laser carriages complete that can be purchased for a reasonable price.
     
  4. augustov

    augustov Senior Member

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    Yes how is mentioned by Paul is better find a laser carrier used.. Because is too difficult change the Cristal, is more easy change the carrier... Also the distance focus is very important... Something is better find a real technician at try to experiment with this... I hope can solve your dude...
     
  5. tmpord

    tmpord Member

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    hey guys and thank you very much for your help.
    When i ve puted back the unit on the machine i ve puted exaclty in the same holes as it was before.
    Is it any change it loose the distance between the plate and laser unit whne i have puted exaclty in the same holes?
    And in which way can i calibrate the unit, is it any program that i must execute inside the menu of the machine or is it only just that tool u are telling me which can do that job?
     
  6. tmpord

    tmpord Member

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    is it anyway the problem i have is that i have lost the zero point of the unit when i have puted back on the machine and that is why it burn the plate only in the one side?
     
  7. augustov

    augustov Senior Member

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    All carrier lose the alignment, because you need put the laser unit and recalibrate, this no matter is installed again in same hole, we talk in 0,001mm not centimeter, a minimum mesuere lost the unit can burn very bad or not, for posotion zero. Is necessary do a gohome command and look is the unit is correctly installed, in anyway you need recalibrated the diode and register, also the dedit and other setting, because lost ALL measure... For this there a specific tools, so it's very difficult take the distance correctly again...
     
  8. Paul Cavanaugh

    Paul Cavanaugh Senior Member

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    Location:
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    It is nearly impossible to put it in the same holes as the holes are elongated for adjustment. We had special tools to align the carriage to the plate cylinder. Diode powers will need to be adjusted some even if you did put it in the correct position.
     
  9. tmpord

    tmpord Member

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    Location:
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    sorry about my delay to answer but that is cause i leave in Greece.
    Are those tools you are teling me two 00.894.1244 gauges as it say in the service manual or required any other tool so i align the unit and where can i find those tools?
    unfortunatly in greece there is not any technisian who knows that type of press so i must try fix the problem alone.
     
  10. Risu

    Risu Senior Member

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    tmpord, I saw your press when it was here in Finland on 2010...2011.
    There was a crack on the lens then already...
     
  11. tmpord

    tmpord Member

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    Location:
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    Hey Risu
    Yes probably it came to me with that problem cause i didnt do anything to the press so it make that crack
    what can i say
    the problem is that there is no techinician here in greece who knows that type of press and for that i must try fix it by my own with the help of all you good people in that site who know more than me...
     
  12. toerkoop

    toerkoop New Member

    Joined:
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    Location:
    The Netherlands
    I can help you with the tools, the spare parts and instruction manuals. I have resolved these problems several times and it is possible to resolve it yourself. Send me an e-mail at di464service@outlook.com.
     

  13. jan

    jan Senior Member

    Joined:
    May 2009
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    237
    Location:
    Austria & Poland
    Hi,
    ask Christos form X-files print in Thesaloniki for help. I know him well, so sometimes I send him a tools for service.
    I could send you a piece of glass and lens if it's needed. It's hard but possible to cut of one piece of glass under one or few lens and replace with new glass. You have to work caryfully and clean. To exchange whole head is of course easier. I've fixed few laser heads in the time as they used to cost 60k€, now they are very cheap.
     
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