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Subject: Help fixing my Hobart 135

Date: 09/07/03 at 1:54 AM
Posted by: JohnH
E-mail: kirwan[AT55]pacbell.net (replace [AT55] with @ to reply)
Message Posted:

I'm a home/hobby welder (with enough engineering degrees to be really dangerous), and have been enjoying the heck out of my mig welder.. been through about two 10 pound spools of wire. But now it's on the fritz; just doesn't fire up when I pull the trigger.

I've checked the switch, and thermostat, and they all seem to be functioning perfectly. The manual has a wiring diagram of the box, but not a schematic of the control circuit board. According to it, there's a 24VAC supply to the board, and 28VDC output to the switch circuit. The input's there, but not the output - so I'm thinking there's a problem with the pcb.

Now for the questions;
- Is there a schematic available for this board anywhere? It's been coated, so I can't read the lables on many of the components

- Is this a common problem? Has anyone else been through this?

- How expensive would a replacement circuit board be?

- I'd rather not ship the whole unit back and forth to Hobart, only to be told the repair will cost half the price of a new welder. Especially when it's probably a $2 component, which I'm perfectly capable of replacing.

Anyone have any ideas?

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