Hello,
I bought an old Sealey Automig 190 that was not working to see if it can be repaired. Didn't cost too much so thought just take a chance. I would appreciate if anyone has any suggestions/ideas as to what the problem(s) might be.
When I bought it, it would switch on, the fan would come on. When pulling the torch trigger, it would make a click sound but no wire would feed out. After a few tries the machine shuts down. After around 5 to 10 mins would switch on and the same would happen.
A friend checked it and said the feed motor brushes are worn so not working. I changed the brushes on the motor, and with the motor off the machine, I tested it directly with a 12V power probe and it works fine (Sealey no longer makes this motor and doesn't have an equivalent replacement; also no specs/part numbers written on motor).
Whilst I had the motor off and welder opened up, I tried the welder. Switches on, fan comes on, when I pull the trigger the contactor clicks, moves in and out, and the machine doesn't shut down anymore. When I put the motor back on, the motor doesn't work when pulling the trigger, but the machine no longer shuts down after a few pulls of the trigger.
I measured the voltage on the plus and minus wires to the feed motor. With motor connected there is no voltage from plus and minus when trigger pulled. With motor disconnected, the wires only give approx 2.9V when trigger pulled. As I understand it should be providing 24V.
Another thing I noticed is, when the machine is switched on, the fan comes on and the speed increases with each increase in power setting. However, when the trigger is pulled the fan slows down noticeable.
There is a power ON red LED. It switches on but also has a continuous flicker, not affected by pulling trigger. Not sure if it suggests anything.
I had a look at the PCB for any obvious burns/damage. Both PCB power relays click on off with trigger. It looks like it may have had some soldering done on it before.
The plus and minus to contactor had some corrosion which I cleaned. After which when I pulled the trigger there would also be a loud buzzing/humming noise. Not sure where the noise came from but sounded more like a working welder should, like something else was engaging better that wasn't previously. But after around 10 tries it faded away.
I've included as much info I can and some pictures. Any help/ideas as to where/what I might look at would be greatly appreciated.
Thank you.
I bought an old Sealey Automig 190 that was not working to see if it can be repaired. Didn't cost too much so thought just take a chance. I would appreciate if anyone has any suggestions/ideas as to what the problem(s) might be.
When I bought it, it would switch on, the fan would come on. When pulling the torch trigger, it would make a click sound but no wire would feed out. After a few tries the machine shuts down. After around 5 to 10 mins would switch on and the same would happen.
A friend checked it and said the feed motor brushes are worn so not working. I changed the brushes on the motor, and with the motor off the machine, I tested it directly with a 12V power probe and it works fine (Sealey no longer makes this motor and doesn't have an equivalent replacement; also no specs/part numbers written on motor).
Whilst I had the motor off and welder opened up, I tried the welder. Switches on, fan comes on, when I pull the trigger the contactor clicks, moves in and out, and the machine doesn't shut down anymore. When I put the motor back on, the motor doesn't work when pulling the trigger, but the machine no longer shuts down after a few pulls of the trigger.
I measured the voltage on the plus and minus wires to the feed motor. With motor connected there is no voltage from plus and minus when trigger pulled. With motor disconnected, the wires only give approx 2.9V when trigger pulled. As I understand it should be providing 24V.
Another thing I noticed is, when the machine is switched on, the fan comes on and the speed increases with each increase in power setting. However, when the trigger is pulled the fan slows down noticeable.
There is a power ON red LED. It switches on but also has a continuous flicker, not affected by pulling trigger. Not sure if it suggests anything.
I had a look at the PCB for any obvious burns/damage. Both PCB power relays click on off with trigger. It looks like it may have had some soldering done on it before.
The plus and minus to contactor had some corrosion which I cleaned. After which when I pulled the trigger there would also be a loud buzzing/humming noise. Not sure where the noise came from but sounded more like a working welder should, like something else was engaging better that wasn't previously. But after around 10 tries it faded away.
I've included as much info I can and some pictures. Any help/ideas as to where/what I might look at would be greatly appreciated.
Thank you.