Heidelberg Sm 102 impression timing problem on single unit

Discussion in 'Heidelberg Printing Presses' started by Veerakumar, Dec 20, 2016.

  1. Veerakumar

    Veerakumar Member

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    Hello frds...
    have a problem in sm 102 -1995/8 Color machine..the problem is on 3 unit . When the start the production the impesion has turned on before the sheet reaching to the unit. So it's making over printing on upto 7 or 8 sheets
     
  2. exheidmech

    exheidmech Senior Member

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    When you go into the printing unit 3 service screen and manually put the unit on impression does it work normally?
     
  3. Veerakumar

    Veerakumar Member

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    No...I can't able to put the inpersion manually..its not turn on..
     
  4. Veerakumar

    Veerakumar Member

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    Manually does not work
     
  5. CHOCK

    CHOCK Senior Member

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    try to clean sensor with some electronic solvente for to clean electronic or devices electronic, they sell in any store for electronic parts, in 3 unitr and tight the socket or terminal very well.
     
  6. Veerakumar

    Veerakumar Member

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    Where that's sensor have fixed?
     
  7. CHOCK

    CHOCK Senior Member

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    I mean if your machine is included with circuit protection voltage unit¿
    if they are please test the voltage for the sheet alignment control +sensor from feeder
    and the sensor for the unit with respective Ampl,connector loose, dirty, broken.
     
  8. exheidmech

    exheidmech Senior Member

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    In service screen you should be able to manually put each unit on impression. Try other units, do other units go on impression when forced maually? To manually put units on impression, press the printing unit button then the service wrench button. This will bring up a screen of all printing units. You will then be able to press each unit and turn it on. All should go on from this screen.
     
  9. CHOCK

    CHOCK Senior Member

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    ok sir if you have location diagram in your schematic diagram
    locate All sensors starting con Feeder +1 units and goes ON until
    delivery and of course if you have coating unit included.
    Clean it, tight the conector , see if they dirty with dust, oil, measure
    the voltage normally +24vdc , see by loose cable, this provoke all this inconvenience
     

  10. Ultra97

    Ultra97 Member

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    Just fixed the same problem on a 1995 6c CD 102 by replacing a bad pilot valve located on the impression piston. There are 2 valves, 1 located at the front and 1 at the rear of the piston. If you watch the piston come on or off , you should be able to tell which end is bad by comparing it to a piston that's operating properly on another unit. Replace both if unsure, they are about $400 each from Heidelberg.
     
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