(Topic ID: 288730)

Bridge rectifier help

By Jets_1479

3 years ago


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  • Latest reply 3 years ago by Jets_1479
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    #1 3 years ago

    Working on a Chicago coin rifle gallery. Having an issue with one relay constantly blowing a fuse every time it’s activated and it’s causing a coil to emit smoke when the fuse is jumpered. Did some digging and schematics review found a potential issue but I just don’t know enough so I am asking for help here. On the schematics my black (1 on pic below) and red (4) out of the rectifier should have 30 vdc but they are putting 45 vdc the green (2) and white (3) show on the schematics 30 vac and put out 34 vac. .... so I am still learning, is this a problem (seems the higher voltage is burning the coil) and if so does the rectifier need replacing or is there an issue somewhere else I need to be looking? Thanks!

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    #4 3 years ago

    Not gonna lie while I understand the high and low tap terminology I don’t know if it is or not so here is a few pictures to hopefully help. Thanks for the help!

    Quoted from GRUMPY:

    This is @ 13 % high. Has the transformer been set to high tap?

    With 34 A/C input the output should be 34 x 1.414 -1.2 = 46.86 You measured 45 volts, nothing wrong here.

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    #6 3 years ago
    Quoted from GRUMPY:

    Are there numbers printed on the paper on this side like 120v, 115v, 103v? I would need a pic of the numbers.
    [quoted image]

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    #7 3 years ago

    Better pictures

    Quoted from GRUMPY:

    Are there numbers printed on the paper on this side like 120v, 115v, 103v? I would need a pic of the numbers.
    [quoted image]

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    #9 3 years ago
    Quoted from JayDee:

    He’s looking for numbers printed on the transformer like I have shown marked in pic. If they are even visible anymore
    [quoted image]

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    #10 3 years ago

    Top 3 lugs are 34v common and 6v
    Bottom 2 are 33v and 10v

    Quoted from GRUMPY:Are there numbers printed on the paper on this side like 120v, 115v, 103v? I would need a pic of the numbers.
    [quoted image]

    #12 3 years ago

    GRUMPY JayDee alexanr1 i tested the smoking coil, it reads all 000 on diode test on multimeter. So I assume that’s my problem I ordered 2 replacements off Marcos, there is another of these same coils in the game, I tested that one and it was reading 1.9 so figured he’ll just replaced them both thanks for the help.

    #14 3 years ago

    Ok, the coil I have is H-27-1500
    I don’t see it on this list....
    Coils burned and melted though seems best to replace as a safety mechanism.

    Quoted from JayDee:

    You should be testing the coil ohms (resistance) to see if bad. Here’s a chart of Chicago coin coils and what the values should be
    [quoted image]

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    #15 3 years ago

    Here is the ohms reading, still think it’s dead though

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    #16 3 years ago

    When I removed it from the circuit the fuse stopped blowing as well

    Quoted from Jets_1479:Here is the ohms reading, still think it’s dead though
    [quoted image]

    #21 3 years ago

    I appreciate everyone’s help, I’ve learned a lot, but I have a lot more to learn. These projects are fun, rewarding and a learning experience for sure. This community being willing to share knowledge is extremely awesome!

    Quoted from alexanr1:

    I was pretty certain it would be a coil shorting, in this case zero resistance through the coil.
    Loved to watch the deep analysis on the power supply though
    Start simple. That’s usually the best approach.

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