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Strange lamp behaviour t2

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  • Strange lamp behaviour t2

    Went over to a mates place today for a bash and he asked me to look at his T2 where when the start button light is connected you get 2 lamps lighting at once.

    Went through single lamp tests and found if I had the start light installed then I would get it light up more than once during the test. Ended up finding a pattern that lamp 84 (start) would also light 74, 85 would also light 75, 86 lights also 76 and 87 lights also 77 and 88 lights 78. The opposite did not occur... Ie 77 did not light 87 and so on. Although from tests 84 to 88 the start lamp was always on. Once the lamp or either lead was removed from the lamp, then everything would work as normal.

    Swapped it for another led, same pattern occurred. Tested all diodes of those lamps and they tested fine in circuit. We also tested the power driver board and mpu in a different machine and lamps all test fine.

    Any suggestions on what else to look for or reasons why switches 81 to 83 don't demonstrate the same behaviour?

    Sent from my ALP-L29 using Tapatalk

  • #2
    Strange lamp behaviour t2

    Would it be possible you have a diode in reverse, or a pinched wire. Had that before on my junkyard.


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    • #3
      Is there a connector plugged into J136? I have seen strange lamp behaviour like you describe with that connector plugged in. Try and unplug it and see what happens.

      http://www.afpinball.com
      "Pinball... harmless recreation for a modest consideration"

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      • #4
        Originally posted by Mitchjjam View Post
        Would it be possible you have a diode in reverse, or a pinched wire. Had that before on my junkyard.


        Sent from my iPad using Tapatalk
        Also had this happen on a Bram Strokes Dracular , lights were on that shouldn't be on . Found a diode was on backwards .
        [MENTION=5936]raysco[/MENTION] helped me on that one..

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        • #5
          Hey [MENTION=4040]robm[/MENTION] did you sort out the issue on the T2?

          Sent from my SM-G800Y using Tapatalk

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          • #6
            Not yet. Old mate swapped lamp hoards with no change. So I will go for another look and maybe spare mpu and driver board just to 100% eliminate them as a possible cause.

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