The older ones are relatively simple. They usually have an ac transformer with multiple taps ( wires coming off the transformer at different voltages), these wires go to the charge selection switch. The AC is converted to DC in the rectifier (often some kind of plate that holds the diodes. The heavy DC cables are connected to the output side of the rectifier, hopefully the DC side has some kind of overload device (breaker). The rectifier is usually the problem. If the smoke has been let out of the actual transformer, the unit is scrap. I have found replacement rectifiers on-line, a direct replacement unit is not required. I replaced the rectifier in one of my solar's with an upgraded unit and it works much better. You can replace individual diodes in the rectifier also. Hint, when replacing diodes the wire in the actual rectifier is high temp wire and may be fragile. Replace any that are damaged with the wire used in a stovetop burner, use the high temp push on connectors also. The guys on this forum can assist you in the repair, show them the picture and they can fix anything.
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