How do I know the Magnatron might be the part I need?
Answer Hi Olin. Usually a high voltage issue will be noticed if there are sparks or a deep erratic growling noise along with it. Use a volt/ohm meter part #@ TJMA-DM1 to assist you in your diagnostics. Disconnect the mag. leads and measure the mag terminals for 1-ohm or less. (Good). Then measure each terminal to ground to check for no-(infinity) ohms that tells us the magnetron is not shorted. If it is then it is part # WB27X10865. Look at the individual external magnets for cracks. Check the diode part # WB27X10037 and the capacitor part # WB27X11031 for proper values. You can not check the supply voltage to a magnetron (or any high voltage device). It is approx. 14,000 volts and is a killer. Thank You.
Need new magnetron, is there a kit or just replace magnetron?
Answer Arnie, there is no kit available. The replacement magnetron for GE microwave jvm1790* models is part number WB27X10865. Thanks!