[FalconEddy]

First post here.

I've spent nearly 30 hours taking this unit apart, measuring key H.V. components (diode, magnetron, capacitor), door switches, thermostats, and flame sensors.

Checked for loose wiring/connectors, bad fuses, and broken wires inside their PVC or cloth insulation jackets.

Performed Key Panel, Smart Board, and Sensor tests; but I still cannot locate the reason(s) why it's not heating. Both the H.V. cap and diode have been replaced even though the originals tested out ok.

Utility supply was measured at 119.3VAC


The H.V. tranny tested out with the following results:

Primary winding: .4Ω

Secondary winding: 68.5Ω (schematic shows nominal as 79Ω) This was measured from the white wire on the tranny to ground.

Filament winding: 0Ω

Primary winding to ground: Infinite

Filament winding to ground: Infinite


The Magnetron tested out with the following results:

Resistance between the two filament terminals: .1Ω

Resistance from filament to Magnetron chassis: Infinite


Now, I don't have a meter that will accurately measure resistance (milli-ohms) in the windings; but the schematic lists them as 430mΩ on the primary and 100mΩ on one of the secondary legs.

Anyone have some ideas??? I'm completely stumped on this one.

Thanks,
FalconEddy