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XMT 350 prepower pc1 control board RC3 troubleshooting

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  • XMT 350 prepower pc1 control board RC3 troubleshooting

    Did all the prepower check on xmt350 serial md4204 (except when igbt tester was needed, do not have one yet) all tests were within specs exept r1 &r8 bleed resistors on interconnect board pc2 reading about 34k threshold is 37-41. Assumed they were bad but when tested with everything unplugged it then reads within specs. Found that only when plug RC3 is connected the ohms drop out of specs, found that pins 1,2,5,6 on rc3 plug on interconnect board cause drops which ties into pc1 control board pins 4,5,6,7(common primary bus -, igbt gate drive signal and return).
    Questions- I am assuming the only problem is on pc1 board? Is there a way to troubeshoot the more exact problem? If so and if someone knows the most likely issue can just that be replaced on the board?
    Side notes- If possible I do not wish to replace the whole board if possible since they are are costly, I have someone who does board repairs but just need to point him in right direction of what needs to be repaired.
    I have attached some picture of manual and if anymore need to be uploaded let me know. Thanks for any help!
    Attached Files

  • #2
    I would figure that's close enough, and look for the problem elsewhere.

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    • #3
      What is the problem with the machine?

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      • #4
        I have not plugged it in to run it yet. I was concerned I might do more damage.

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        • #5
          I went back through my Tech Manual, which is older than yours. Mine says to remove all plugs before checking measurements, which I didn't see in the screenshots of the manual you show. Like Bushy said, it doesn't throw up any alarms, but it may be worth a call to Miller Tech to confirm.

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          • #6
            Yours says to do that for all prepowers checks? Mine says only on the pc1 tests.

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            • #7
              My tech manual has a separate note in the PC1 and PC2 pre power checks to remove plugs before testing.

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