how to repair a stabilizer?

I have a v guard stabilizer- input voltage 280 and o/p voltage 200-250v,  now its not in working condition I want to rectify it myself, I opend it it consists one circuit board, and transformer and 2 relays, but I can't able to find how it works, I don't know how to check the transformer o/p because it getting i/p from circuit board and main phase connection is going to two relays and circuit board getting the i/p from transformer and main card its totally confused, so how can i check the transformer, circuit board weather realy is not working properly

iceng5 years ago
This is how to test an unknown disconnected transformer.

If the 40W lamp is fully bright, don't try the other wattages.
Either you have a short or the XFMR is sill connected.

Sorry to tell you but to test relays in a circuit you cant draw for us to see
is to much for you to try without vocational training.