(Topic ID: 305700)

S.A.M. LED DMD replacement

By PinMario

2 years ago



Topic Stats

  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 2 years ago by Shogun00
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    #1 2 years ago

    Hi All,
    We have several Stern S.A.M. pins with DMD issue's (Indiana Jones, Pirates and 24).
    I tried to replace them with a third-party LED DMD but it doesn't work, nothing on the screen at all. This DMD works great on WPC or Whitestar systems.
    Any suggestions or tips why the S.A.M. is special ?

    Thanks!

    #2 2 years ago

    WPC and Whitestar use High Voltage to energize the DMD. If the new DMD is working on a WPC machine, it’s obviously a high voltage DMD. Not sure, but I think SAM machines were sometimes using 12vdc to energize the DMD. Could be that you need the low power led version DMD for the SAM machines.

    #3 2 years ago

    MMGB you are correct about the high voltage, this dmd needs a separate low voltage power supply but accepts the signals correct on a WPC, whitestar, Gottlieb sys3,... but NOT on a S.A.M. system running already LED DMD. This is what puzzles me.
    I have found that on S.A.M.'s with a Xpin LED DMD there is a small pcb between the flatcable and the MPU, perhaps someone can tell me why this was needed?

    #4 2 years ago
    Quoted from PinMario:

    MMGB you are correct about the high voltage, this dmd needs a separate low voltage power supply but accepts the signals correct on a WPC, whitestar, Gottlieb sys3,... but NOT on a S.A.M. system running already LED DMD. This is what puzzles me.
    I have found that on S.A.M.'s with a Xpin LED DMD there is a small pcb between the flatcable and the MPU, perhaps someone can tell me why this was needed?

    Sounds like you have a High Voltage version of the LED DMD, which contains components that converts the 65 volt circuit (found on older machines) to 5 volts. The problem here is that the SAM only has a 12 volt circuit (max) for the DMD. It's not enough voltage to power those high voltage components.

    You will either need to buy a low voltage version of the LED DMD or buy a bridge board (the one you saw on Xpin). That bridge board bypasses the high voltage converting process and converts a 12 volt circuit to 5 volts instead.

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