Question about GE JVM1630 Microwave Oven
Ouch. Magnetron check performed with multi meter.
1) Disconnect power to unit
2)Allow to stand for minimum 5minutes
4)Find large insulted screwdriver
5)short terminals of capacitor to dissapate charge. (If no pop or crackle its possbly already bled through resistor.
Right. Magnetron check both terminals for short to casing if shorted, replace. Check reading between terminals low resistance or direct short is not a problem. Open circuit, replace.
For non heating, this is usually barrel fuse, typically HV 5Kv or more, faults in an overcurrent situation.
Check the capacitor for shorts to casing, a short will indicate a failure. Check the diode in the capactior if fitted by reverese continuity check accross the terminals. MUST DISCHARGE FIRST, else you'll blow the meter up and likely recieve a SEVERE burn.
The most common cause would have to be a problem with the capacitor next the transformer for loud humming. Three basic checks for the transformer.
Probe the low voltage side first, open circuit? replace. a low reading is normal, high voltage side is a two part process, take a reading between the two terminals one goes to the magnetron the second to the capacitor directly. this should be approx the same reading as the LV coil. The last and most important coil is to check the coil side ofthe barrel fuse to ground, this will measure between 80 - 150 on a digital meter, around 90 to 100 for a 900w is in the normal range.
Loud humming is created primarily by having a working transformer with no wher to send the voltage out.
It will only be one or more of these three items, which will cause this, the rest is safety and control gear.
Posted on Dec 10, 2008
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