Dead transformer in UPS

The transformer in my Tripp Lite "Internet750U" UPS appears to be dead. 120v goes into it (measured near where the power cord goes into it) but nothing comes out the other side.

The sci.electronics.repair faq and http://sound.westhost.com/xfmr.htm both lead me to believe I should check for a thermal fuse under the insulating wrapping.

The FAQ says
"There may be a thermal fuse buried under the outer layers of the transformer which may have blown. These can be replaced but locating one may prove quite a challenge."

There's no visible bulges in the wrapping; do I just cut into it and try to find the thing? I'm not terribly afraid to destroy it. If I can't repair it, I'll want to hack the remains into a standalone inverter and use a standalone charger with it (and maybe a bigger battery -- say, the one in my RV).

Are there any other diagnostic tests I should try first?
.

Relevant Pages

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