Where did you read that there should be a resistance of 75-200 Ohms? Was it between the winding and the frame of the transformer as it seems a little high? But that may depend on the actual transformer I suppose
If you did measure the resistance of the secondary winding between the HT lead and the frame with the transformer isolated from the circuit and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
=== Update (10/19/2020) ===
Hi @noltian ,
Check that you have connected the diode around the correct way.
Is there a wiring diagram on the inside of the cover of the microwave?
I couldn’t find the wiring diagram for your model but here are two images showing how GE microwave ovens are wired. Essentially they are the same. Check that the wiring in your oven connects the same way from the transformer outputs to the other components.
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I though that the transformer connections were a plug in type so that they only connected the one way but maybe not.
+
I thought that the transformer connections were a plug in type so that they only connected the one way but maybe not.
Where did you read that there should be a resistance of 75-200 Ohms? Was it between the winding and the frame of the transformer as it seems a little high? But that may depend on the actual transformer I suppose
If you did measure the resistance of the secondary winding between the HT lead and the frame with the transformer isolated from the circuit and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
+
+
=== Update (10/19/2020) ===
+
Hi @noltian ,
+
+
Check that you have connected the diode around the correct way.
+
+
Is there a wiring diagram on the inside of the cover of the microwave?
+
+
I couldn’t find the wiring diagram for your model but here are two images showing how GE microwave ovens are wired. Essentially they are the same. Check that the wiring in your oven connects the same way from the transformer outputs to the other components.
+
+
I though that the transformer connections were a plug in type so that they only connected the one way but maybe not.
Where did you read that there should be a resistance of 75-200 Ohms? Was it between the winding and the core as it seems a little high? But that may depend on the actual transformer I suppose
+
Where did you read that there should be a resistance of 75-200 Ohms? Was it between the winding and the frame of the transformer as it seems a little high? But that may depend on the actual transformer I suppose
-
If you did measure the resistance of the secondary winding between the HT lead and the core with the transformer isolated from the circuit and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
+
If you did measure the resistance of the secondary winding between the HT lead and the frame with the transformer isolated from the circuit and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
Where did you read that there should be a resistance of 75-200 Ohms, between the windings and the core as it seems a little high? d the core with the wiring disconnected from the transformer as the core may be earthed and a wire connected to the transformer may also be connected to earth when perhaps it shouldn’t be?
+
Where did you read that there should be a resistance of 75-200 Ohms? Was it between the winding and the core as it seems a little high? But that may depend on the actual transformer I suppose
-
If you did measure the resistance of the secondary winding with the transformer isolated from the circuit wiring and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
+
If you did measure the resistance of the secondary winding between the HT lead and the core with the transformer isolated from the circuit and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
Where did you read that there should be a resistance of 75-200 Ohms, between the windings and the core? It should be inifinity i.e. open circuit. The core is there to provide a low reluctance magnetic path between the primary and secondary windings. There should be no ''electrical'' connection between any winding of a transformer and the core.
+
Where did you read that there should be a resistance of 75-200 Ohms, between the windings and the core as it seems a little high? d the core with the wiring disconnected from the transformer as the core may be earthed and a wire connected to the transformer may also be connected to earth when perhaps it shouldn’t be?
-
Did you measure the resistance between the windings and the core with the wiring disconnected from the transformer as the core may be earthed and a wire connected to the transformer may also be connected to earth when perhaps it shouldn’t be?
-
-
If you did measure the resistance with the transformer isolated from the circuit wiring and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
-
-
If there is an electrical connection between a winding and the metal core in a transformer, with no external wiring connected to it, then it means that the insulation between a winding and the core has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips i.e. low resistance current path to earth.
+
If you did measure the resistance of the secondary winding with the transformer isolated from the circuit wiring and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
Where did you read that there should be a resistance of 75-200 Ohms, between the windings and the core? It should be inifinity i.e. open circuit. The core is there to provide a low reluctance magnetic path between the primary and secondary windings. There should be no ''electrical'' connection between any winding of a transformer and the core.
-
Did you measure the resistance between the windings and the core with the wiring disconnected from the transformer as the core may be earthed and a wire connected to the transformer may also be connected to earth when it shouldn’t be?
+
Did you measure the resistance between the windings and the core with the wiring disconnected from the transformer as the core may be earthed and a wire connected to the transformer may also be connected to earth when perhaps it shouldn’t be?
If you did measure the resistance with the transformer isolated from the circuit wiring and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
If there is an electrical connection between a winding and the metal core in a transformer, with no external wiring connected to it, then it means that the insulation between a winding and the core has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips i.e. low resistance current path to earth.
Where did you read that there should be a resistance of 75-200 Ohms, between the windings and the core? It should be inifinity i.e. open circuit. The core is there to provide a low reluctance magnetic path between the primary and secondary windings. There should be no ''electrical'' connection between any winding of a transformer and the core.
Did you measure the resistance between the windings and the core with the wiring disconnected from the transformer as the core may be earthed and a wire connected to the transformer may also be connected to earth when it shouldn’t be?
-
if you did measure the resistance with the transformer isolated from the circuit wiring and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
+
If you did measure the resistance with the transformer isolated from the circuit wiring and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
If there is an electrical connection between a winding and the metal core in a transformer, with no external wiring connected to it, then it means that the insulation between a winding and the core has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips i.e. low resistance current path to earth.
Where did you read that there should be a resistance of 75-200 Ohms, between the windings and the core? It should be inifinity i.e. open circuit. The core is there to provide a low reluctance magnetic path between the primary and secondary windings. There should be no ''electrical'' connection between any winding of a transformer and the core.
Did you measure the resistance between the windings and the core with the wiring disconnected from the transformer as the core may be earthed and a wire connected to the transformer may also be connected to earth when it shouldn’t be?
+
+
if you did measure the resistance with the transformer isolated from the circuit wiring and it read 0.03 Ohms then replace the high voltage transformer as it is faulty.
If there is an electrical connection between a winding and the metal core in a transformer, with no external wiring connected to it, then it means that the insulation between a winding and the core has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips i.e. low resistance current path to earth.
Where did you read that there should be a resistance of 75-200 Ohms, between the windings and the core? It should be inifinity i.e. open circuit. The core is there to provide a low reluctance magnetic path between the primary and secondary windings. There should be no ''electrical'' connection between any winding of a transformer and the core.
Did you measure the resistance between the windings and the core with the wiring disconnected from the transformer as the core may be earthed and a wire connected to the transformer may also be connected to earth when it shouldn’t be?
-
If there is a connection between a winding and the core with no external wiring connected then it means that the insulation on a winding has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips.
+
If there is an electrical connection between a winding and the metal core in a transformer, with no external wiring connected to it, then it means that the insulation between a winding and the core has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips i.e. low resistance current path to earth.
Where did you read that there should be a resistance of 75-200 Ohms, between the windings and the core? It should be inifinity i.e. open circuit. The core is there to provide a low reluctance magnetic path between the primary and secondary windings. There should be no ''electrical'' connection between any winding of a transformer and the core.
-
If there is it means that the insulation on a winding has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips.
+
Did you measure the resistance between the windings and the core with the wiring disconnected from the transformer as the core may be earthed and a wire connected to the transformer may also be connected to earth when it shouldn’t be?
+
+
If there is a connection between a winding and the core with no external wiring connected then it means that the insulation on a winding has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips.
Where did you read that there should be a resistance of 75-200 Ohmsbetween the windings and the core? It should be inifinity i.e. open circuit. The core is there to provide a low reluctance magnetic path between the primary and secondary windings. There should be no ''electrical'' connection between any winding of a transformer and the core.
+
Where did you read that there should be a resistance of 75-200 Ohms, between the windings and the core? It should be inifinity i.e. open circuit. The core is there to provide a low reluctance magnetic path between the primary and secondary windings. There should be no ''electrical'' connection between any winding of a transformer and the core.
If there is it means that the insulation on a winding has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips.
There shouldn’t be an electrical connection between any winding on a transformer and the core.
+
Where did you read that there should be a resistance of 75-200 Ohmsbetween the windings and the core? It should be inifinity i.e. open circuit. The core is there to provide a low reluctance magnetic path between the primary and secondary windings. There should be no ''electrical'' connection between any winding of a transformer and the core.
-
If there is it means that the insulation on a winding has broken down and the bared wire is touching the core. Most probably the core is touching the metal frame of the oven or is earthed somehow, therefore the breaker trips.
+
If there is it means that the insulation on a winding has broken down and the bared wire is touching the core. Most probably the transformer is mounted such that the core is connected to the metal frame of the oven or is earthed somehow, therefore the breaker trips.
Hi @noltian ,
Replace the high voltage transformer.
There shouldn’t be an electrical connection between any winding on a transformer and the core.
If there is it means that the insulation on a winding has broken down and the bared wire is touching the core. Most probably the core is touching the metal frame of the oven or is earthed somehow, therefore the breaker trips.