Story time!
I was poking around my boss's office looking for a heat gun to solder a no-lead package IC onto a board when I saw a big, rather old logic analyzer (80 channel, HP 1652B with built-in oscilloscope.) Anyways, he was like, "I was using it about 3 months ago and suddenly magic blue smoke came out, burning electronics smell came from it, and it died." Curious, I thought. Probably the power supply, and the power supply is the bread-and-butter of a technician's skills. I was hoping it'd be linearly regulated for simplicity, but it's an SMPS = Whatever.
Anyways, I took it home, plugged it in, and it turned on and seemed fine for a few minutes. Then, no magic smoke, but it turned off and had burning electronics smell. I isolated the cause to be the power supply, it kept making a clicking noise and emitting the burning smell, so I asked around and it seems like it's a bad transformer.
TL;DR: Bad transformer in switching power supply.
The OEM which made the power supply doesn't seem to exist anymore (Boschert), and it's very difficult - even on eBay and the like - to find a replacement HP power supply (they were also used in 1653Bs and some oscilloscopes, I think 54501A uses it, but those are also kinda expensive.
So, how feasible is it to actually re-wind a transformer for a power supply? That seems like my only real option at this point, really.
Thanks much.