Need Help Identifying PCB Mounted Transformer

[crazijoe07]

Hi! I have a circuit board which has a small transformer mounted on it which I believe is bad. It has a sticker on it with '4080' on it. The Board runs on 24v DC and outputs 50v - 100v DC @100ma. This is a power source for an old gamewell fire alarm system. The gamewell circuit which hooked to the board shorted and got really hot, now I get 0v from the board.

 

[Bluejets]

Are you sure about those input /output levels..?
If so, it could be an early attempt at a dc/dc converter but doesn't appear to be enough components in the vicinity.
Also, in these, the tranny rarely, if ever, fails.

Show a top view of the complete board.

 

[crazijoe07]

I have a manual for this thing and it does mention a DC to DC converter. Attached is the schematic.

 

[Minder]

Many of those types of transformer have a thermal fuse embedded in the windings, with some luck you can detect the two ends of the fuse and short them out to test, transformers seldom fail open, usaully shorted.
M.