Fake 220 AC Voltage Reading….
A welding technician brought his machine for repair. According to this person, the machine was completely dead and needed urgent repair.
Do did you see how cables are connected. It was very obvious this welding machine was in someone else repair shop. Someone connected the neutral wire to ground and that is a very stupid mistake.
I disconnected the cable right away and reconnected it where it should be and powered on the machine but sad to say, it did not power on.
While it was connected to power, I checked voltages at the main input of that board and it was showing me 220 AC volts but when I checked the reading on the main capacitors there was Zero voltages there.
When traced the reading back to the main power switch was still giving me a steady 220 AC volts there and that was very strange.
I believe it was a fake 220 AC voltage reading because when I connected a light bulb
there the light came on for a few seconds then it went off indicating a loose connection somewhere.
The main loose connection was at the main power switch. The phase wire was hanging on to one thread or two on that wire. I fixed that and powered on the machine and as you can see it was up and running.
I took a quick look on that board and I saw a lot of OK soldering joints but it still needed some re soldering job and that is what I did before putting everything back and give it to the customer.
The output voltages were steady and of course I did some welding on it; it was working according to specification.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous repair articles in the link below: