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take it in for a check of the relay for the wire that turns on the power when the trigger is pressed
that relay activates the gas solenoid and the power to weld
There could be a few different reasons why the welder on the Miller Trailblazer 250G 4000 watt generator welder would quit working but the generator still works. Here are a few things to check:
Check the welding settings, make sure they are appropriate for the type of welding you are doing. Make sure the voltage and amperage are set correctly.
Check the ground connection, make sure it's clean and tight. The ground connection must be secure for stable welding.
Inspect the welding cables and make sure they are in good condition and that the connections are tight.
Check the welding gun and make sure it's clean and in good condition.
Check the main contactor and make sure it's engaging and disconnecting properly.
Check the main circuit breaker and make sure it's not tripped.
Check the power output of the generator and make sure it's within the correct range.
Check the control circuit and make sure that it's not damaged or malfunctioning.
Check the engine oil level and make sure it's not too low, low oil level can cause the engine to overheat and stop working.
Check the air filter and make sure it's not clogged, if the air filter is dirty, it will cause the engine to run hot.
It's important to check the manual of the welder for troubleshoot steps and also check the warranty of the welder and see if it's still covered by the manufacturer. If you are not able to find the problem or if you are not familiar with welding equipment, it's best to take your welder to a qualified Miller Electric welder repair service center, they will be able to diagnose and fix the issue.
Hi:
Have you disconnect the gun's power plug? If the wire and gas stop flowing by doing this action, then your problem is the gun's trigger. If the machine continues to feed gas and wire with the gun disconnected then yes, it is the pc board.
Good luck.
If you have power on the input side of the temp sensor and no power out yes you can jumper the temp sensor. You should also be able to test the temp sensor with a match. Un-mount it, then heat it until it clicks and check for continuity. (Remount when complete) If you have continuity with applied heat the problem is not the temp sensor. It could be a fan relay problem.
If your sure you want to bypass normal fan power, I would look for the power source for the fan on the welder's schematic and then run a seperate in-line FUSED power lead to the fan and then ground the other side to the chassis. Make sure the source you choose has enough amperage to power the fan. Some places on the main board if you tap 15VDC you can damage the main board.
Your gas hose or torch could be bad or plugged. Your gas solenoid on the welder itself could be bad. Disconnect the torch gas hose at the welder and see if you have gas coming out of the welder itself.
With a tig welder it is designed to do this. The gas is used to shield your weld of all airborne contaminates. Your welder should have a flow on start of weld and what they call a post flow. This post flow protects your finished weld from contamination. You can preset it from 0 to 30 seconds on a majority of welders. I would recommend you set a postflow for at least 10 seconds and hold the torch above your finished weld until gas shuts off. It is doing this for a reason! Too Protect your weld from oxidation and other contaminates while the molten weld pool sets up! Hope this helps out!
Try to short the trigger wire back closer to the unit or better still inside the panel somewhere. There is often a relay that is operated that allows gas to flow and power to the wire feed motor. Check where the trigger wire goes it may give you some idea. If you can identify the part you can source one and see if it worthwile repairing. Cheers
You don't say why you need schematics. Most of the stuff that you need to know to install, use, and understand the welder is covered in the operator manual. You can get one at this web page.
There is also a copy of the schematic diagram on the inside cover of most Miller welders. Please be careful if you're not familiar with high current power supplies, you could get hurt pretty badly in the blink of an eye.
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