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Start at the place the power cord connects to the PS board and start working your way towards the output of the power supply. Check for proper voltage at ALL points the schematic list a voltage value for, and the first point that has the wrong value or no reading is where you should start checking/replacing parts. Usually the defect is in one of the parts connected to the first point that is at the wrong voltage.
I'm by no means the best person to ask about solid state (there are few SS devices that I will bother with, and most that that I have and would consider fixing I've never needed to), but there are many here who are. That trouble shooting procedure can be applied to any power supply of any vintage and point one to the region of the failed part(s), and in some cases the exact part(s) that died.
I hope you can find the problem easily, and if you get lost I'm sure someone here can help.
Tom C.
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