Sm 74 kvt 7ffb

Discussion in 'Heidelberg Printing Presses' started by Nagarajan, Nov 30, 2020.

  1. Mathew

    Mathew Senior Member

    Joined:
    Apr 2010
    Messages:
    361
    Location:
    Kolding-Denmark
    I'd seen this problem two times before on SM74-4H 1998 and PM74-4 2002. On SM74 the problem was bad connection between AVM and UVM. There is a flat cable + a connector with 5 wires. Disconnected them and clean with contact cleaner spray and dry with blast air. Some of pins from these two connectors are oxidated.
    The other machine PM74 had an issue with AVM. One of the IGBT driver cards (don't remember the name) was damaged.

    Good luck
     
  2. Beguin

    Beguin Senior Member

    Joined:
    Jan 2020
    Messages:
    126
    Location:
    Côté d'ivoire
    after research, kvt 7ffb gives nothing as a clue, which means that it is normal.
     

  3. Nagarajan

    Nagarajan Member

    Joined:
    Nov 2020
    Messages:
    15
    Location:
    India
    Main motor cycle not run

    Stry main motor

    Msk PCB red led indicates
     
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