I had a Stereo (tuner/amplifier) that went dead on me. No lights, no sound. I opened it up and started searching for the problem. The fuse was good and I had line voltage at the primary side of the power transformer but no voltage on any of the secondary windings. I then unplugged it and used an ohm meter to check the resistance on the windings. The primary side has 4 terminals marked 0V,120V,220V and 240V but only uses the 0 and 120V. I assume the others are for when the product is sold in other countries. I found that the windings between 0 and 120 were open. It occurred to me that the 0 to 120 winding should be identical to the windings between 120 and 240 so I reconnected the supply mains to those post on the transformer. I powered it up and it works again.
Is this an acceptable practice or should I expect some problems with it?
Is this an acceptable practice or should I expect some problems with it?