SM 74 DYN TEST 12 SSK1 7F7F fault DYN TEST 13 SSK2 7F7F fault

Discussion in 'Heidelberg Printing Presses' started by pressmachines, Jul 6, 2020.

  1. pressmachines

    pressmachines Member

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    Hi,

    SM 74 - No fault in INIT TEST 1 to 13. But DYN TEST 12 SSK1 7F7F fault DYN TEST 13 SSK2 7F7F fault. Check and install already new NTK 5 volt and NTK 24 volts.

    Always fault goes away after switching off and switching on the main switch of the machine one to two times. Sometimes there is fault sometimes there is no fault, but most of the time there is fault.

    If the fault occurs the SSK 1 and SSK 2 boards - there is no flashing of lights and the values of the service display SSK1 and SSK2 are "0" Please see screen shots below

    Tech says the SAK2 board might be the problem, have a used SAK2 board which I test, the outcome was same as above. Cannot rule out the possibility the the SAKs boards that I have are defective without any new SAK2 board to test, but can the 2 SAK2 boards with I have here have the same outcome.

    Any help or suggestion is appreciated. Hear from anyone soonest. Screenshot_20200706-190024.jpg Screenshot_20200706-190046.jpg IMG_20200706_184356.jpg IMG_20200706_184356.jpg IMG_20200706_184403.jpg
     
  2. CHOCK

    CHOCK Senior Member

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    Hi sir;
    Please test the following steps;
    1)Clock monitoring of the 3 servo-drive ICs on the SSK (clock
    absent).
    2)Voltage higher than 24V DC (> 33V DC).

    3. The voltage is not +15V DC.
    The voltage is not –15V DC.
    The voltage is not +24V DC.
    Interference in the data communication with the SAK2 (detected
    by SAK2).
    4. Reference voltage 1
    5 Excessive temperature of transistor bridge (4 transistors).

    6 Signals from washup cloth sensor while motor is not controlled
    (washup cloth is drawn in).
    No signal from washup cloth sensor (washup cloth supply roll
    or motor blocked).

    7. Motor blocked mechanically, positioning cannot be completed.
    8 Motor outside the control range.
    9 Motor with precision potentiometer blocked mechanically.


    Blessing
     
  3. Mathew

    Mathew Senior Member

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    Location:
    Kolding-Denmark
    Hi,
    I had seen this error on early developed CPTronic machines from early 90's to 98. Once Drupa machines were developed, Heidelberg fixed this problem by replacing SSK module with new generation SSK2. Basically they upgrade software and used better and updated components. ERROR 7F7F is an interference between one or two SSK modules and has no relation to SAK2. Once you face this problem, take out SSK2 from slot and switch ON the machine. Once the machine initialized, check SSK-1 actual value and possible INIT and DYN errors. If everything was ok, check the other SSK in the same slot. Switch ON and OFF machine few times each time you put SSK modules in. You should be able to find defective module. There is a red LED on SSK and it lights up once NT85 module power up. The defective module may have a longer period to RESET and delay in LED light up.
    You didn't mention anything about machine type. If you have SM74-5, you can print with machine if you have 4 color job but on CD/SM102 it is almost impossible. Please send a photo from software version menu where indicates software's of electronic modules. REK, MSK, SRK and ....

    I also had an experience with flat cable from SSR to RER. You can also replace this cable as well. Sometimes IDC connector are rusty and there is a poor connection between pins and plugs. You can make the cable by yourself.

    Good luck,
     
  4. pressmachines

    pressmachines Member

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    Thanks. Will ask my tech here when he comes to check and try it out. I will email you version of software now as requested. Thanks
     
  5. pressmachines

    pressmachines Member

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    Thanks. Will ask my tech here when he comes to check and try it out.
     
  6. pressmachines

    pressmachines Member

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    Hi Matthew,

    Encountered new fault today Init Test 13 SSK2 C2 0101 see attached screen shot, fault did not go away after turning the power on and off . Dyn Test same error as before, after turning power on and off no more fault. Also see attached software versions as requested. Any additional suggestions are appreciated. Thanks
     

    Attached Files:

  7. Mathew

    Mathew Senior Member

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    Did you try with one SSK? I also asked machine type!!!
     
  8. pressmachines

    pressmachines Member

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    Machine is a 6 color. On the SSK will wait for my tech to do it, have no experience in pulling out and putting in the boards might make a mistake. Will update you. Thanks.
     

  9. Maher Sayed

    Maher Sayed Member

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    Location:
    Egypt
    Hello,
    First, replace the flat cable from SSR to RER (at the left side of the back side of the boards wall) usually it makes the problem.
     
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