Faulty Rail King Z-750 Transformer

Here are a few photos of the interior.  

Did you measure the transformer output voltage prior to the breaker? Also did you check for continuity of transformer windings? Also, look for any bad soldered joints or broken wires.

Thank you for replying.  There is no output voltage prior to the breaker.  There are no broken wires and the solder joints look solid.  I don't specifically know how to check continuity of the transformer windings however on the input side touching each of the two input terminals shows continuity between them and there is no continuity between either of the input terminals and the two output terminals. Is there something else I need to check?

Thank you again

Jim

Also on the output terminals there is no continuity between the output terminals prior to the breaker.

Just wanted to verify that if you check the 2 prongs of the line cord, you get continuity. If that's the case, the primary winding of the transformer is ok.

Since you have apparently have no continuity at the output, you could isolate the problem as follows.

Put one probe of your continuity tester on the sleeve of the output connector. Using the other probe, work backwards to determine where you do not have continuity. You may have to remove the heat shrink tubing to access the solder joints.

You could also check the center output connector. There should be continuity between it and either side of the circuit breaker.

Lad,

If what you call the prongs of the line cord refer to the plug to the wall then there is continuity between the two prongs.  The center of the output connector has continuity with the side of the breaker that is attached to the black wire but not the white wire (the breaker is not tripped at the time of the continuity check).

What confuses me is that there is no continuity between the two wires (one with white sheath and one with black sheath) as they exit the coil (the white and black wires seen in photo #2).  Nor is there any output voltage at those wires when plugged into the wall outlet-I think that there should be 18-21 volts of output voltage.  This leads me to believe that there is either a break in the winding or maybe a short? Perhaps my next step is to remove the red wrap on the upper winding.  Any other suggestions are appreciated.

Jim

Jim,

Before digging into the transformer itself, unsolder both wires connected to the secondary and test again. If with nothing connected to the secondary you have neither continuity, nor voltage, then indeed it is the transformer.

Usually, the transformer is the last thing that goes, the circuit breaker and wiring are usually the first suspects.

Lad

Ok I'll give that a try.  Thank you for your help.