Miller Syncrowave 180SD welder repair shop in Charleston, S.C.

[Mike22590]

Well....I don't have any idea what's causing my welder to not arc or flow gas when the foot pedal is depressed. Tried the suggestions to others on here with 180SD issues to no avail. Does anyone know of a competent welder repair shop in the Charleston, S.C. area? Thanks!!!

PS. s/n is KK120959

[ryanjones2150]

Ship it to cruizer.

[cruizer]

Funny..... with the machine "on" take a pap45er clip and stick it into A & B on the machine remote amphenol, What does the machine do?

[Mike22590]

Nothing happened. No arc or gas flow.

[cruizer]

Does the fan run at its normal speed when you turn it on

[Mike22590]

Yes....the fan comes on as it always has. Fan stays on the whole time the machine is powered up. The dark blue light would illuminate when I pressed the foot pedal down before but only the light blue light is on.....the welders power light. I'm stumped. Thanks for the help......

[cruizer]

The Blue light on and off tells me that the trigger circuit is working, the pilot light near the on/off switch should be on steady as well though. Power after the switch is working cause the fan is on. Whats bothering me, is that the even if the rectifier/mods were smoked, the gas would still run. So I'm guessing when you paper clip or press the foot pedal, the HF still comes on, just no arc or gas. Have you tried the unit is Stick. if you don't have cables for it, just turn the local amperage down and scratch start the Tungsten in the stick setting

[Mike22590]

The light blue/white light next to the on/off switch is on when the machine is running. The fan is on all the time as before. The HF does not work when I press the foot pedal....the darker blue light does not come on at all and no gas. If I put the machine in stick mode with the amps set at 70.....the tungsten will lightly spark against the workpiece. If I then depress the pedal fully....the tungsten emits a bright white light and gets stuck to the workpiece. The tungsten melts because of no gas I'm guessing. The paperclip trick did not change anything. Thanks for your time.

[cruizer]

2 things it could be, first off, your missing a phase, likely want to measure your in coming voltage phase to phase. NOT phase to ground. or the trigger circuit in PC1 is pooched.

[Mike22590]

I measured white to black wire=240v.....white to bare copper=120v and bare copper to black=120v. I can check again tomorrow. Thanks again. When I checked the points gap, I didn't see any circuit boards inside but I wasn't really looking for one at the time.

[cruizer]

That board is really expensive, however, logic points to transistor Q1 as being the culprit. Least wise it looks like a 1, I'll pull the diagram up on my big screen tomorrow.

[Mike22590]

Hey cruizer......any more ideas?? Thanks!!!

[H80N]

Q1 is your likely problem.

Q1....industry part number pls..??? 2NXX??

[Mike22590]

I don't know where that number is located. I did remove the 2 circuit boards.

[Mike22590]

Pic