(Topic ID: 263442)

WPC 16-opto switch board hot

By PAR

1 year ago



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  • 5 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by PAR
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    #1 1 year ago

    This is a cross post regarding an issue on getting my cobbled together DH up and running but do these boards typically run "hot", 1/2 my optos are not functioning and half of them are. The resistors on the half of the board that is working are almost too hot to touch. Does this board typically function this way in games that it's used in when everything is working as it should? I am just curious if the heat is an indicator of a problem or nothing to worry about, thanks

    #2 1 year ago

    The resistors drop ~11V across them and dissipate it as heat which is why they get hot. If half of your resistors are not getting hot than the opto transmitters associated with those resistors are not pulling any current which is why they are not working, best guess is you have a broken wire on the ground side of the circuit for those optos.

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    #3 1 year ago

    They run hot, and even hotter when the 339 chips blow. I replace the resistors with new ones and mount them up off the board a little bit to get some airflow underneath them. Usually they are cooked if they were run on any type of route in the past.

    #4 1 year ago
    Quoted from slochar:

    I replace the resistors with new ones and mount them up off the board a little bit to get some airflow underneath them.

    I do the exact same thing whenever I have one on my bench, hard to tell from the image but the resistors are 3/32" off the board.

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    #5 1 year ago

    Opto issue solved, found a Multiple bad wiring hack on the receivers and ground wire harness to the trough board. I was able to pull a harness off the extra playfield I have and presto the game boots and starts, now on to the next issue, all the coils from j130 on the driver board don't fire, thanks so much.
    I like the idea of mounting the resistors further off the board great idea.

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