Thread: M542 Driver

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  1. #1
    Guys

    Does anybody have an M542 open sat on there bench? i have one here i picked up that has a blown component that sits right behind the +- power connections on the board. I can not make out if it is a protection diode or what value it is? can anybody help please?

    Thanks

    Paul
    If the nagging gets really bad......Get a bigger shed:naughty:

  2. #2
    You mean the SMT stuff?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  3. #3
    I do Robin
    If the nagging gets really bad......Get a bigger shed:naughty:

  4. #4
    The model unit i have is the M542-G and the component is larger than the SMT's you have in that pic
    If the nagging gets really bad......Get a bigger shed:naughty:

  5. #5
    Wont be back home until Friday so can't check, but here's a photo I took earlier of an M542:

    Click image for larger version. 

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    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  6. #6
    Thanks Jonathan but that is a completely different to mine. Interestingly though you have a large through fuse roughly where my smt one is. If only i could get a rating might give me clue. I'm trying to get a photo up of it now.
    If the nagging gets really bad......Get a bigger shed:naughty:

  7. #7
    Here is the one i have

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    Notice the nicely blown component up the top to the right.
    If the nagging gets really bad......Get a bigger shed:naughty:

  8. #8
    Hmm, that's a bit different to others I've seen. What's the number adjacent to the blown component, 'V?5'? There looks to be a stripe on it, which would imply a diode or a transient voltage suppression diode. Is it in series or parallel with the power input, or something more imaginative?
    Do you know what caused the fatality?
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  9. #9
    Yes it could be a protection diode? problem is it is too chard to be sure about position and the number is V55. looking at the other components the ones labeled 'V' would suggest diodes? problem is 'V' can also mean 'variable component', those outside of being a resistor or cap. My guess is that he put the supply wires around the wrong way. I want to replace this first before i can apply any power to it.

    I also scored a 2M88ON that has problems too, Tant has been replaced on that one already so will need to do some scope work to find the issue.
    If the nagging gets really bad......Get a bigger shed:naughty:

  10. #10
    If you can find what the component is connected to that should make it fairly obvious...

    Quote Originally Posted by 2e0poz View Post
    My guess is that he put the supply wires around the wrong way. I want to replace this first before i can apply any power to it.
    That's easily done as different drivers put them different ways round - if I recall correctly the 2M880n is the other way round. I've got some pictures of inside a 2m880N, but unfortunately they're mostly out of focus or too dark to see anything useful:

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    Just out of interest which mosfets does the 2m542 you have use? The one I looked at has IRF9Z34N
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

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