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Reply to "Looking for schematic for K-line K-950 Transformer"

Tom, Since you are an electronics technician you could unsolder the 3 wires going to the potentiometer and the 2 wires going to the SPST switch on the pot.

Use your VOM meter to measure the pot. It will have 3 terminals. Measure the outer 2 to determine the resistance of the pot. Now you need to determine if this is a linear or taper pot. Use your VOM meter again (on the ohm setting) and put it on one outer terminal and the middle terminal. Slowly turn the pot knob from side to side and watch the meter to see if the resistance changes smoothly or tapers. Even if the shaft is broken you may be able to turn it with a pair of needlenose pliers. Now that you know the resistance of the pot and the taper you can purchase one from one of many electronic supply places. Digikey, Mouser, Jameco, etc. You should be able to get a pot with a SPST switch. If it just the switch that is broken you might be able to replace it with a separate small toggle switch. If the shaft is broken and you cannot move the pot shaft at all you could still measure the pot resistance (outer terminals). I would guess it is a linear taper. If it is just the switch on the pot that is broken you could plug the transformer into a plug strip and use the on/off switch on that to turn on/off the transformer. It would probably make more sense to just purchase a new transformer. Since you like to fix things, you can figure out the pot resistance and purchase one. While the pot make have the 3 terminals go to a circuit board inside you can cut those. A new pot could be placed in the case and you could solder wires to the 3 terminals on the pot and solder them to the circuit board.

 

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