(Topic ID: 172903)

Rottendog WPC 50V Gone

By rogerdodger

3 years ago

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  • 17 posts
  • 3 Pinsiders participating
  • Latest reply 3 years ago by rogerdodger
  • Topic is favorited by 1 Pinsider


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    #1 3 years ago

    Hi Guys:

    I did a misconnect on J113 on the Rottendog driver board (34 pin ribbon connector) and now the 50V and associated solenoids are not working. 50V LED indicator is out. All fuses are good. There are no burned tracks or traces.

    I put in a driver board from another machine and everything worked as it should, so it is definitely a board problem.

    I'm pretty good with a soldering iron, so is there a specific component or components associated with this problem that I can replace, to fix the problem?

    I have a DMM but I am not very good at testing components!

    Thanks so much.

    #4 3 years ago

    Thanks for the thought but J102 is connected.

    It was working fine until I decided to install a new ribbon cable and that's when the misconnect happened.

    Basically, I installed the J103 on only half of the pins and I guess thats what caused the problem.

    #5 3 years ago
    Quoted from Pin_Guy:

    You will want to measure the fuse, not just look at it as it can be blown and look fine.

    Yes, I did remove every fuse for testing with a meter and all are good.

    #7 3 years ago

    Thanks to everyone, so far.

    I don't see any bridge rectifiers on this board?

    It is a Rottendog, which I think is designed differently from the original?

    #10 3 years ago
    Quoted from Pin_Guy:

    I just realized I am assuming this is a WPC89 board

    Yes, that is correct.

    How do I do the measurements you suggest? Can I measure these components in circuit or do I have to remove them? Power on, I assume?

    #12 3 years ago
    Quoted from Pin_Guy:

    with the power on, set your meter to AC Volts; place one of the test leads on the striped side of D501 and the other on the striped side of D503, it doesn't matter which color lead you put where. This will tell you your AC voltage from the transformer is making it to the bridge rectifier circuit.
    Next put your meter on DC volts, place the red lead on TP6 (+50VDC) and the black on TP5 (GND) you should read around 75V; this is likely not going to be correct but I'm interested in what you have there.
    Alternately you should be able to measure the resistance of these diodes, with the power off and J102 disconnected, put the black lead to the cathode (stripped side), and the red lead to the anode, they should check similar to each other.
    You can also compare them to the 20V diodes (201 and 501, 202 and 502, etc.) again they should read similar; please post what you measured.

    Thank you so much for helping me .... Here are the test results:

    a/c voltage from D501 to D503 is 63.5V

    d/c volts at TP6 and TP5 is 0V

    Resistance for the following diodes is:

    D501: -1.08
    D502: -5.45
    D503: -1.53
    D201: 6.22
    D202: 7.57

    Hope this info helps!

    #14 3 years ago

    Thanks PinGuy... you're the best!

    I think I will go ahead with replacing them.

    You said replace all 4 but I have listed 5 of them on my test. Which 4 should I replace?

    Also, how can I tell what value rectifier diodes to order? As it's a Rottendog board, there are no values in the pin manual.

    Thank you.

    #17 3 years ago

    Thank you Marc and PinGuy.

    I will contact Jim at Rottendog and see if he will send me the parts.

    I will post the end result here but it may be a week or so.

    Thanks again.

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