Question about GE JVM1660 Microwave Oven
Our GE JVM1660 turns on for about 3-4 seconds and then shuts off completely and resets itself. After trying to start it several times, the power turns off completely and we have to unplug and re-plug it in for it to turn back on.
The turn table also stopped working a few weeks ago. Any suggestions?
The turntable problem is probably a failed motor, but that's a secondary problem.
Sadly, we hear of this over and over.
This is usually due to a defective or loose magnetron causing electrical interference and disruption in the control circuit board.
If your magnetron was recently replaced, it may have loose mounting nuts or bolts or maybe the wire mesh RF gasket was not installed or got pinched.
It may also need a new high-voltage diode and stirrer, and the cavity may be affected.
GE had a campaign (but not a recall, mind you!) covering several models.
Details are in their bulletin at http://220.127.116.11/mwd/ge_mw_mag_kit_bulletin.pdf
Even if your model is not on the list, the same problem can occur, requiring a kit. I just think the difference is that GE has stopped paying for the repairs.
The parts kit (that GE used to pay for) is part # WB27X10489 and is shown here: http://18.104.22.168/mwd/wb27x10489_ge_mag_stir_kit.jpg
If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk
There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.
You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383
We're happy to help and we appreciate your thoughtful rating of our answer.
Posted on Apr 08, 2008
I had the same problem, though in my case it started as an intermittent problem where the stove would only occasionally reset. Over a two week period it eventually degraded to where it would consistently reset itself. I did a lot of online searching and the consistent answer that I found was that leakage from the tube/guide was most likely interfering with the control board and causing it to reset. Well maybe that's the case in many situations but why would this interference consistently reset the board? Why wouldn't the interference drive the board into some random crazy mode? Again, why always a system reset?
In my experience the event that most often triggers a microprocessor reset is a power glitch, so I decided to pursue this avenue as possible root cause.
The schematic for the microwave indicates that there are three sensor/switches (thermostats) in series with the power feed which are designed to shut off the system if the cabinet, the mag, or the vent hood get too hot. These thermostats carry all of the system current and open when they hit their thermal threshold. In my case all of the switches tested good for impedance and in fact the resistance was barely measurable. Though the switches measured good while not in operation, I reasoned that a bad thermostat might actually self heat due to the load current it has to carry to run the microwave and heat enough to trigger an overtemp.
So I proceeded to test this idea by disconnecting one of the thermostats and shorting the connections to either eliminate it or prove it was root cause. In my case I got lucky, the first sensor that I tried (the hood tco, which is the easiest to get at and is the least critical in the protection circuit) proved to be bad. So I replaced this $20 sensor and all is fine now.
WARNING: Proceed carefully here: these sensors are there to protect the microwave from overheating and burning down your home! Do not under any circumstance permanently bypass any of these sensors. For testing purposes I believe that temporarily bypassing either the hood or cook chamber tcos is acceptable for a short durration (seconds). **** I would NOT attempt to bypass the magnetron sensor in any circumstance. If the other two prove to be okay then risk $20 on a new sensor for the mag instead risking a fire! *****
Posted on Oct 27, 2008
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