Electronics > Beginners
What can cause Topward 6603A power supply transfomer heavy vibration & noise ?
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alsetalokin4017:
Check the fans.
BrianHG:
Though it's not a Topward 6306D, I have a few 500va and 1kva toroid transformers which once in awhile powerup with a huge hum and vibrate.  Nothing seems to be wrong, the application is working fine, they are not heating up or anything, it's just like the transformer started off on a bad point of the AC cycle and decided to generate this hum until I turn it off, then turn it on again.  This weird lemon powerup only happens around 1 in 200 power cycles & all I do is cycle the power to fix it.  I have no clue why.  All these toroid are commercial grade premium transformers spanning different years and manufacturers and they are not operating under duress.
Kleinstein:
Especially large ring core transformers might get upset with to much DC voltage one the grid. This can increase the audible noise as it brings the core closer to saturation on one side. So it could be neighbor using something like hair dryer on low power setting or a kind or poor dimmer for the lights.
DarkAvenger183:
Hello, have you found what was causing this problem? Did you fix this issue?
My Topward PSU has a similar problem. I would like to fix it
IanMacdonald:
First check the four through-bolts in the transformer for looseness. There might also be another loose piece of metal in the vicinity, flapping in the magnetic breeze from the transformer. If no joy, varnishing the laminations with a good quality thin varnish that will run into any gaps between them, may help.
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