Heidelberg ZP 72-2 CPC Problem

Discussion in '4-Color Offset Presses +' started by Usman, Mar 1, 2021.

  1. Usman

    Usman Member

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    Hi
    I have a problem in ZP 72-2 machine, Piano Key`s Lights not light up. while all the NTK supplies Have Green Light.
    Kindly guide to resolve the issue.
    upload_2021-3-1_15-52-18.png upload_2021-3-1_15-53-34.png upload_2021-3-1_15-54-24.png
     
  2. CHOCK

    CHOCK Senior Member

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    Hi sir:

    1)Test all Ribbon cables or flat cables, for : a) bad contacts b) loose cables c) dirty d) oxide e) broken)


    2)
    Edge connectors are a common souorce of problems. Power down the system and remove the PC boards. Examine the edge connector
    for contamination and clean with contacts cleaner contacts. Reseat any loose components such as scoketed ICs) . Reseat the
    boards and power up.


    3) However if the NTK ARE IN Green light, NOT imply that POwer supply is o.k, must be in Tolerance, 0.7% up or down, otherwise, is defective, need to replace or repair
     
  3. Usman

    Usman Member

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    Thanks for your Kind response Chock.
    I tested all the ribbon cables and Edge Connectors, it seems good.
    But the problem is still present.
     
  4. CHOCK

    CHOCK Senior Member

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    ok look for the following:

    1) test for dry +col solder joint

    2) you did NOT reply about my question : However if the NTK ARE IN Green light, NOT imply that POwer supply is o.k, must be in TOlerance, 0.7% up or down, otherwise, is defective, need to replace or repair!
     

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  5. Usman

    Usman Member

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    Thanks Mr . CHOCK;
    I tested the voltage at point of 5VDC , i get 4.7VDC.
    Also find no point of Cold or Dry soldering Joint.
     

  6. CHOCK

    CHOCK Senior Member

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    No sir, you need test all the Power supply for Vdc. NOT only +5vDC

    2) Measure: a) -8vdc b)+8Vdc c) +12Vdc )

    3)How you did test the I tested all the ribbon cables and Edge Connectors,? this is 70% if failure in Electronic!
     
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