(Topic ID: 257609)

Help troubleshoot Night Rider

By Drain1

2 years ago

Topic Stats

  • 5 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by Drain1
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    #1 2 years ago

    Help. Old time EM guy trying to help a friend get his free Night Rider working. Game is at his loc, half hour away. Have installed new rectifier board at the transformer and all voltages are there. Game has a Stern "100" MPU board. I get a flicker then 7 flashes on the LED....with a longish pause after the first and second flash. No further boot-up, but I do have GI lights and the first press of the test button seems to go into lamp test. No displays working at all. Where do I go from here?....SDB?
    Bob, In Vt.

    #2 2 years ago

    Might be one of those games that needs a ball in the trough to start in attract mode. Also, sure the 43v solenoid voltage is getting to the bottom left side of the MPU board?

    Could try reseating the top right 2 connectors on the SDB and the bottom left connector on the MPU board. If it boots, then you may have some tarnished pins to deal with.

    #3 2 years ago

    If you're getting the lamp test, the MPU has booted up properly. Also confirmed by the seven flashes. The pause between flashes sounds normal. Are you getting +190VDC on each display?

    As for no ball kicking out/solenoids, is the fuse on the underside of the playfield ok?

    No ball is necessary for any attract mode. IIRC, Night Rider does not have an attract mode but it's been 43 years....

    #4 2 years ago

    You have 7 flashes so that's good. The GI comes strait off the transformer so that will come on no matter what.
    The games goes into lamp test you say? So that means it's booted. What about the other tests like solenoid test?
    Displays need 190v from the HV power supply on the SD board. Your next step is to check the input and output voltages and the tiny fuse on that.
    What about the coils test? Does it cycle through? Not sure if KR had one but look for a playfield fuse on the bottom of the playfield by the flippers.

    #5 2 years ago

    Thanks all for the responses so far......will have owner check fuse on underside/flippers, also make sure a ball is in place anyways. test button has no effect after first press to go into lamp test. Will also reseat connectors. Is there a test point on the displays to look for 190v?

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