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In Reply to: RE: Power transformer for NAD C162 posted by JonM on July 01, 2017 at 14:53:52
Kind of a long shot, but only costs time. Peel the insulation off of the transformer and take a look. Sometimes it is a simple problem. In this case, with an open primary, the primary coil may be (un)soldered to the wires that leave the transformer.
I've had about a 50% success rate in fixing transformers of different types, but it is more frequently a short to the case or core.
This idea appeals to me. The secondary wires simply unplug from the circuit board, so only the two primary wires need to be desoldered from the back of the power switch. If the plastic wrapping around the toroid is easy to peel back, it's definitely worth a shot. I'll take a look this weekend. Thanks!
Replying to my own post - since there is no fuse visible on the primary, I suspect a thermal fuse in the transformer. I haven't peeled back the wrapper yet to investigate, but if the problem is a blown thermal fuse, I can remove that, and install a suitable fast blow fuse external to the transformer in its place.
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