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Subject: Re: Help fixing my Hobart 135

Date: 09/08/03 at 11:39 AM
Posted by: JohnH
E-mail: kirwan[AT55]pacbell.net (replace [AT55] with @ to reply)
Message Posted:

In Reply to: Re: Help fixing my Hobart 135 posted by G on 09/08/03 at 1:05 AM:

Ok, more specifics...I bought the machine new, online from weldingdirect.com just over a year ago. I did stop at my local welding shop, and all they could offer is "send the whole machine in". Being a pennypincher, I hate to do that over what is likely a $2 part.The machine powers up, the fan runs, but nothing happens when I pull the trigger. No wire feed, no arc. Normally, you can hear a little click from inside the machine when the trigger is pulled, now nothing. I was working on a project, and it would work intermittently, sometimes coming back when I cycled the power switch, now it's just off for good. I suspected the switch, so got out the ohmmeter, and verified that it is working - all the way back to where it plugs in to the machine (infinite ohms until you pull the trigger, then zero). There's also a thermostat buried in the transformer, but that shows a closed circuit like you'd expect. I tried bypassing the thermostat, but still nothing. Digging deeper, the wiring diagram shows that there should be 28 volts DC supplied to the gun switch from the control circuit board - when the trigger is pulled, it routes that voltage essentially to the relays that run the wire feed motor and arc transformer. But a test with the voltmeter shows only about 2 volts on these lines. This leads me to the conclusion that there is a problem in the circuit board. And the hope that a schematic might be available. Failing that, I'd be happy to send in just the board for testing, if Hobart would work that way (which I doubt). Or I'd buy a replacement circuit board if the price were reasonable (say under $100).But I do appreciate any help you (all) can offer.

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