Hi Again,
My friend has a power supply made by Pyramid Gold Series. Model Number is PS-8K. Output voltage is supposed to be at 13.8 volts. The problem is that its reading about 23.5 Volts . We changed the the 2N3055 silicon NPN power transistor. No Difference. The circuit board inside is small about the size of a cigarette pack. Is there anything else that controls the voltage ? There is a variable pod inside but it doesnt do anything. Thanks Guys...........................
Check ZD1, it is a 12 volt zener diode, it sounds like it may be open circuit. I hope the schematic for the PS-8K is the same as the PS-8KX as I am going off of the 8KX version, it should be the same board though.
. We changed the the 2N3055 silicon NPN power transistor. No Difference. The circuit board inside is small about the size of a cigarette pack. Is there anything else that controls the voltage 
? There is a variable pod inside but it doesnt do anything. Thanks Guys...........................