The schematic may not show the actual colors of the tranny, as it is from the box.
and so don't assume, but try to get everything to verify it.
And also you can measure the tranny if that's all you have to go on.
leads can get mixed up when you are dealing with transformers, it's common mistake, so double check.
If you did not get a sheet with the unit, call the manufacturer and cry until they give you one.
just because Dober uses brown yellow on the schematic,
it does not mean that another transformer uses the same color code. Never assume this. Always verify.