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Thread: Xmt 304

  1. #1
    Join Date
    Jan 2007
    Posts
    16

    Default Xmt 304

    My adult son bought a XMT 304 off local classifieds. Divorcee getting rid of stuff. XMT belonged to ex. He used it all the time, she said. Been sitting in storage over a year, she said. No way to try it at her location. You can bring it back if it doesn't work, she said. My son brings it to the shop. Plug it in. Lights come on, hear clicks and beeps, then a blinking HEL P7 code comes up. Download owners manual. We check wiring under the cover, OK. Our voltages OK. No output. Told son to return it to the lady. Story short, lady gone. Her crackhead son says FU it's yours. Lesson learned. Contacted Miller. "take to authorized service facility. Too much liability to tell you anything". OK, I can understand that in today's lawyer infested world. I'm not entirely stupid as to the inherent electrical hazards of this unit, but I can use a multimeter or change out a PC board without endangering myself. According to the operators manual, PC-1 main control board may be the problem. Serial # of machine is LF141807A. My question is this: would this machine be worth trying to repair or should we sell it as salvage and take the lumps. It is very clean in and out. My son has somewhat less than a thousand in it. He was trying to surprise me with this machine. Can't fault him for his good intentions. Hoping you Miller gurus might offer a ray of hope here.
    Thanks,
    Lake

  2. #2
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    985

    Default

    I am sure Dwayne or Cruizer will be by shortly. Here is some leisure reading in the mean time. http://www.millerwelds.com/resources...-xmt304-help-7

  3. #3
    Join Date
    Jan 2007
    Posts
    16

    Default

    Thanks Mr. Walker,
    I'll give it a read.
    Lake

  4. #4
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,725

    Default

    Help 7 merely means that you output board caps can't maintain a proper charge and can't discharge, If you were to remove the cover, or the right side there are a couple large capacitors under that "output" board. Remove the 4 5/16" head cap bolts, pry the board back slightly, and with a ohm meter check the resistance. must be around the 18 K ohm mark. If not just order one or 2 from Dijikey. I remove the board then flame the old ones off, much easier that a soldering gun. and put the new ones on.

    You can change them out with the 20K versions ohmite part# L25J20KE
    Last edited by cruizer; 02-08-2014 at 03:55 PM.

  5. #5
    Join Date
    Jan 2007
    Posts
    16

    Default

    Mr. Cruizer,
    Thank you for your advice. We will dig into it as per your suggestion on Monday. Will probably have questions as we go along if you don't mind our inquiries.
    Best regards,
    Lake

  6. #6
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,725

    Default

    Yep, I like inquires, and hopefully solve your problems in an effiecient manner

  7. #7
    Join Date
    Jan 2007
    Posts
    16

    Default

    Cruizer, OK, I'm ready to get after this thing. I've removed the small bolts that hold the output board to the blue capacitors, pulled the board away from the capacitors and am now ready to measure the resistance of what to what? You indicated about 18K ohms. Would this be across each of the capacitor terminals ? I tried that and I get a climbing number on my DVM. Sorry to be so blind.
    Thanks,
    Lake

  8. #8
    Join Date
    Jan 2007
    Posts
    16

    Default

    Quote Originally Posted by lake View Post
    Cruizer, OK, I'm ready to get after this thing. I've removed the small bolts that hold the output board to the blue capacitors, pulled the board away from the capacitors and am now ready to measure the resistance of what to what? You indicated about 18K ohms. Would this be across each of the capacitor terminals ? I tried that and I get a climbing number on my DVM. Sorry to be so blind.
    Thanks,
    Lake
    I also checked the capacitors with my old Simpson analog VOM and they spool up
    to about 60k and then discharge to zero and spool up from the other direction to the same values. Took them out of the machine to test and they look fine, no lumps or burn marks. I also checked them with DOM with a ufarad test position and they both dialed in at 2685 ufarads. I don't think the capacitors are bad, but I don't have the correct equipment to verify my assumption.
    Thanks,
    Lake

  9. #9
    Join Date
    Nov 2009
    Location
    western mass
    Posts
    203

    Default

    yea it sucksto buy something that doesnt work. the lady probably seemed nice but maybe knew it didnt work? i bought a dynasty 200dx that didnt work. it was a couple months out of warranty. luckily miller covered the parts and the guy paid the couple hundred labor. these small inverters are small,lightweight and powerfull, but real expensive to repair. you open one up and wonder how it even works. looks like a tv inside.hopefully cruizer can get you going. hes a heck of a tech guy.good luck

  10. #10
    Join Date
    Jan 2007
    Posts
    16

    Default

    Quote Originally Posted by cayager View Post
    yea it sucksto buy something that doesnt work. the lady probably seemed nice but maybe knew it didnt work? i bought a dynasty 200dx that didnt work. it was a couple months out of warranty. luckily miller covered the parts and the guy paid the couple hundred labor. these small inverters are small,lightweight and powerfull, but real expensive to repair. you open one up and wonder how it even works. looks like a tv inside.hopefully cruizer can get you going. hes a heck of a tech guy.good luck

    Cayager
    Thank you for the sympathy. My son is pretty torqued over this. I'm afraid he'd wind up in jail if he ever came across that woman or her son again. Appears now that the whole thing was a deliberate fraud, but my son should have been a lot more cautious. He knew better. His experience was kind of like stepping into a dog pile in the middle of the sidewalk. Just gotta open your eyes and watch where you put your feet! Seems like we all get a lesson like this! Glad you lucked out on your 200dx. Great little machine. (I have a Maxstar 200SD. Recently piped in a new boiler install (10",8",6" & 4" pipe) with that little Maxstar. A weeks worth of steady, stick welding. Thought sure it would die on the job, but it didn't!) Anyway, I know Cruizer (and a few others) could sort out this XMT thing of ours in a heartbeat!
    Lake

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