I suspect capacitors or voltage regulator as voltage jump's all over the palace Lm78L12acz OR possibility Q1 but cant read manufacture part number and have not taken off potentiometer off board so I can find out part number. you know how busy thanksgiving day is!
appreciate any help with the part numbers for Q1 which is mount with heat sink etc.
thanks for any help with IC part numbers is A to 220 base
Alan
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I have the same issue with two 40-750 Transformer controllers. Both produce about 9 volts at max setting while my 40-500 shows 18 volts at max, all against the same 100 watt transformer brick. I disassembled one 40-750 and there is evidence on the board of heating at the three soldered contacts of the same component that bolts to the heat sink. If I had a part number I think I could do the repair. Anyone out there with the same problem or with a part number?
The 40-750 produces a maximum of just shy of 9 volts against the 40-500's 18 volts AC. Any other thoughts on components that might have failed? Sure seems like the Rheostat component to me.
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