Its too bad you cannot find out the specs on the transformer as I would guess you could pick one up for under £100?
If you want to spend the time, one way is to reverse engineer it, this way.
Usually, although the winding is fried, they seldom open, so you check with a meter for the secondary connections, i.e. how many and if any are centre tapped.
They are usually wound on top of the primary which is wound first.
Unwind the secondarys, counting the turns as you go, make a note of taps etc, if any.
The next is to detect the turns per/volt.
You know what the primary voltage is, e.g. 240ac. So you need to count the primary turns, unfortually they are wound with many turns of fine wire.
So you can do this two ways.
Either peel off and count as you go, or at this point, after the secondaries are off, use a hack saw with a very fine blade and section the primary winding. This makes it SLIGHTLY easier to count the turns.
One you have this you can calculate the secondary voltages they will be directly proportional to the turns/volt, the Physical size of the transformer indicates the VA.
If it is an odd ball spec, I would buy a Toroid type that was close and modify or wind the secondaries you want, it is easier to do with a toroid.
The fact it is mounted on the back of the unit makes it a bit more flexible.
Test any Bridge rectifiers or power diodes in case this was the original cause.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.