Carver MXR-150 Receiver

I have a Carver MXR-150 receiver and its not working. It won't send any power out to the speakers at all ... how do I trouble shoot what is wrong? It is already taken apart on my desk and I am befuddled lol ... thanks in advance

The receiver turns on but after I leave it on for like 1 minute or so it smells like something is burning.???