(Topic ID: 233814)

Bally -22 HV HELP


By Fordiesel69

5 months ago



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  • Latest reply 4 months ago by Fordiesel69
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    #2 5 months ago

    You have the collector connection to the transistor cut off (middle leg) which is what is needed to be done here. But with the collector pin cut, the only means of connecting the collector is through the tab. But you used an electrical insulating thermal gasket there (thermal gasket is OK) and you also used a nylon screw which is not OK. You must use a metal screw there with a star lock washer on bottom of board so the transistor can make good electrical connection with the trace on the bottom of the board.

    #4 5 months ago

    TO-66 transistors (old 2N3584) relies on the case to make the input connection. You get the same connection through the tab of the new BUX85.

    You *could* isolate the tab from the heatsink but still must make good connection to the trace that shares the same screw hole. To do this, you need to reduce the screw size to a #4 and use something like a 7721-7PPSG nylon shoulder washer. This would be an ideal condition as the heatsink would no longer be connected to high voltage (original design had the heatsink connected to high voltage) but still make connection to the PC board.

    See this thread:
    https://pinside.com/pinball/forum/topic/replacing-obsolete-ballystern-hv-to-66-transistor-with-more-available-to-220#post-2948736

    #7 5 months ago

    Not likely. Hot R51 is due to Q23 being fully turned on. Missing collector connection to Q22 (plastic screw) would result in Q23 being fully turned off and R51 would remain cool.
    Sounds like Q23 is shorted. Q22 probably isn't too healthy either.

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