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Spectrum 187 Plasma Cutter

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  • mmurray39
    replied
    K got some bits waiting on others. When does ships from USA mean Hong Kong??

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  • mmurray39
    replied
    In checking the power supply traces from octicoupler just playing around got to the 1M0680 r doesn't checkout bad not blown up but there cheap this machine had some kind of overcharge issue changing the others for same reason just thought already there umm maybe I ll do comperison the factory oem parts are deffinantly going back in when they arrive was just throwing a semi legible though out there.

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  • jjohn76
    replied
    There are a lot of 5v 1A voltage regulators out there, but it's worth replacing with the same unless you can see what voltage is being fed to it. Some, particularly the low dropout voltage (LDO) regulators, get their ratings by limiting the max input voltage.

    If you can get them free, compare the max input voltage, the max junction temperature and the power dissipation numbers between the one you want and the 7805.

    ​​​​​​​I am guessing the M10680 is VR4? Was the M10680 bad? Any of the components on it's drive side bad? Or any components in the power supply feeding it bad? I can't confirm without seeing it, but would say that is the controller for your auxiliary power supplies through the transformer (looks like a flyback transformer since that M10680 had only a single driver).

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  • mmurray39
    replied
    Not sure whether to mess with the 1m0680 r seems to do most everything think its the brain

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  • mmurray39
    replied
    Was thinking or an upgrade the 7085 ct for. Acst10107 and the irf510 foracst1608gkek numbers mach up pretty.good seem to do the same things. Linear voltage 1a out 5v there free got original fets coming. ??still got diode prob small now unlike before so somthing good happened

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  • mmurray39
    replied
    Kinda thought so seen 1 for $ 1200 thought they where crazy waiting on parts hanging in there

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  • jjohn76
    replied
    That's a zero ohm resistor. It's worth downloading the datasheet and seeing if those components are still available before pulling them. Many are no longer available.

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  • mmurray39
    replied
    No pulled to check hey is this a zero ohm or 10 ohm resistor. There except for the diode one of two legs missing anyway

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  • jjohn76
    replied
    Are all of those components bad? Did you pull for LA8040 off the heatsink? Was the 7805 on a heatsink? If the 7805 is bad, chances are the micro-controller (looks like U1). Is that upper right component Q5? It's hard to believe the unit would still do anything at all with that many components bad.

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  • mmurray39
    replied
    Doing um. All there are 1 big log 3 mimi loge look more like analog prob not nowhere near today's superchips still slugging away death in.famaly thurs blew that day up owe well just sluggin

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  • mmurray39
    replied
    Great

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  • jjohn76
    replied
    I can't remember if there are one or two micro-controllers on that board, but they're programmed on chip and very likely only for that machine.

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  • mmurray39
    replied
    Hey get today off gonna put new bits in now as most everything electronic(liking 43 max. Simplicity)if it had a stroke the brain chips i expect are programmed just for this or where they that far along back in 07. Thinking 256 computers where big umm o7so ill give it a go we will see checked the diode fees they check the 1 2 pole took it out the other 2 the s to d to g an back over seemed to be pretty close octicoupler seems to be alright. Not lookin forward to playing with the big electric lol

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  • mmurray39
    replied
    The lem was just i was there rember the ole Chrysler hall effect ignition $20for2. Been everywhere else not a fan of the board construction. Lol. Having thoughts. 2 mo ago plug it in now sorta sorta prob wrong might know nothing there's newer diffrent stuff doing same thing and we get a new chip production plant just around corner the patent owned by millerweld are very interesting as to workings and goings on some smart boy there

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  • jjohn76
    replied
    The one up above showed a 250VAC rating, so it works in AC circuits - not polarized. Depending on your multimeter and what's in parallel the circuit, the resistance across a capacitor can say a lot of things. They eventually read whatever is in parallel with them, so if the resistance goes to zero, there may be a shorted component (snubber diode?) in parallel.

    What's going on with the Hall sensor (LEM)?

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