Transformer substitution question

Yes you should be OK ..

Or, have confidence in your repair. If it failed at the pin, it was a solder problem, not something more ominous.

If the new soldering was done properly, it should last. If it were something else, it's likely the failure would be inside.

--- sam | Sci.Electronics.Repair FAQ Mirror:

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You better be worried about a fire hazard ! There usually is a good reason for a transformer to burn it's coil.

There is nothing basically wrong with resoldering the part, but _please_ make sure that there is some thermal cutout device in the circuit. (And that it is thermically coupled to the transformer.)

Don't most/all transformer primaries have this?

Tom

They should have. (But I wouldn't bet on it.)

Depending on where you live, extra care should be taken when you do the repair yourself. If there is a fire, an insurance company may require proof that you didn't tamper with any fireprotection that was present in the device.

Thanks for all the replies. What made me decide to replace the transformer was that I just didn't think the initial repair would hold, it was rather delicate to do. I had resoldered the tiny copper strand back on the solder tab, I think the strand still had some lacquer/glue/adhesive on it after attempting to clean it, and had less than a millimeter of play; I just wasn't satisfied I had enough contact surface and it was difficult to properly and cleanly wet the joint. Ugh.

I ended up installing the replacement transformer, a 36v CT 1A unit riveted outboard on the chassis, the original being 38v CT 500mA, and cleanly tiewrapped the cabling to an existing harness and onto the PCB.

I measured the same voltages on the various screw terminals as with the previous (flaky) transformer.

The fuse hasn't blown yet, and I have a fire extinguisher handy :-)

Thanks to all,