mov impression problem

Discussion in 'Heidelberg Printing Presses' started by alx, Jun 1, 2018.

  1. alx

    alx Member

    Joined:
    Jun 2012
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    34
    Location:
    manila, philippines
    guys need help with impression problem.

    sometimes 2 to 4 unit will not engage. only 1st unit will engage impression.

    how can i fix this?

    also when the machine stops, last sheet doesnt have the last 2 unit color.

    tia
     
  2. junker1984

    junker1984 Senior Member

    Joined:
    Jan 2010
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    560
    Location:
    US, Midwest
    Hello alx, You didn't mention the model year of your MO, but I'll assume it's pre-1990 and not CPTronic. Your problem likely stems from worn roller switch components. Look at the switches that ride a cam on the impression cylinder journal. These are under the operator side covers.
     
  3. mantman

    mantman Senior Member

    Joined:
    Nov 2015
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    Location:
    Greece
    I had the exact same problem and technician checked and I confirm what junker says about the roller switch
     
  4. alx

    alx Member

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    Jun 2012
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    Location:
    manila, philippines
    yes sir junker, it is without cp tronics. please see 2 images..

    1st image i found a hole in the plunger. it got stuck up.
    [​IMG]
    after replacing the switch with a new one, impression worked for awhile. then again becomes intermitent
     
    Last edited: Jun 1, 2018
  5. alx

    alx Member

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    Location:
    manila, philippines
    roller switch.jpg

    can i put epoxy to fill the hole?
     
  6. alx

    alx Member

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    Jun 2012
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    Location:
    manila, philippines
    2nd image.
    roller switch1.jpg

    from what i understand the two arrows pointing to the 2 screws is normally connected.

    when plunger is down it should release the contact. unfortunately mine is always on contact whether plunger is up or down. is this normal?

    picture reference is the first unit.
     
  7. junker1984

    junker1984 Senior Member

    Joined:
    Jan 2010
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    Location:
    US, Midwest
    Epoxy is a good fix. I have done that often. Regarding the contact points, they must make/break as the cam turns. Maybe you were looking at points while on high side of cam? Also, you must check all roller switches at printing units #1 and #2 in order to get proper sequencing of relays in cabinet. I should have mentioned you must also mark position of switches with a scribe.
     

  8. CHOCK

    CHOCK Senior Member

    Joined:
    Dec 2016
    Messages:
    861
    Location:
    Managua
    Dear Sir:
    Mr Colleague Junker has reason.
    Please test the limit switchs in section Printing # 2: #b201 +b261 +b262
    2) Section printing # 3: b 267+b268+b269+
    3) Section printing #4: b270+b271+b273
    All this are called Limit switch Cam for 1+2+3+4 printing units.
    Please use the schematic diagrams, and location components.
    Test the continuity contacts, for dirty oil, oxide, or burn, or broken. Clean or repair, and tight very well the Loose wires in the L.switchs
    Let me know
    Blessing
    superchock@yandex.com
    celular+WhatsApp:+505 88611441
     
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