Question about GE JVM1640 Microwave Oven

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Ge md# 3670

Replaced Main Control Board and now the magnetron is overheating and shutting down the unit. Didn't have this problem has before.

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Re: ge md# 3670

Did you chceck the Triac
see if shorted

Posted on Dec 23, 2007

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Re: ge md# 3670

If you are familiar with Micro oven servicing follow these steps

.Repairing a microwave oven is a dangerous task. The high-voltage potential combined with the high-current capability of an operating microwave oven pose a deadly threat to a careless worker
1.Shorted Magnetron tube.
2.Replace Magnetron tube
3.Check Built-in surge protection on printed circuit board has opened. This circuit consists of a fine foil pattern (or filter coil - depending on the model) that acts to fuse the primary side of the low-voltage transformer.
4. Rebuild the surge protection circuit. Replace the varistor
5. Magnetron filament connectors have loosened and, due to resistive heat, the terminal connections have deteriorated and burned off.
6. Repair defective terminals as follows:Either (1) Cut away burned wire, clean the magnetron terminals, and replace the slip-on connectors, or (2) Cut away burned wire and connector(s). Clean terminals to prepare for soldering. Solder filament leads directly to magnetron terminals. Be careful not to apply soldering heat any longer than necessary
7. Check for Weakened fuse clips in the fuse receptacle causing fuse to melt due to resistive heat. Usually indicated by a bead of solder leaching out from either endcap and/or evidence of overheating (or burned spot) at the endcap, fuse clip, or terminal connection

8. Replace amp fuse and receptacle. Generic fuses and fuse holders are available at appliance and electronic part suppliers.
9. Contact service center .. all the best ..thank you

Posted on Dec 23, 2007

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Disconnect the oven from power and allow cooling down. Most GE have temperature controlled fan system.

The Fan is controlled by main pcb and powered along the line passing through the door lock switch, with circuit supplying power to the magnetron and turntable motor.

The fan is also operated directly by the control board.

If the turntable was also running, then the door switch is shorted. In that case the magnetron may be working as well, better not to start the microwave oven.

If only the fan is running, then the main pcb must be replaced, or the damper motor relay must be replaced.

Call GE and arrange repair, the unit is faulty.

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My microwave oven shuts down when set at high a high cooking number. I must wait a while before it can used again. I have a GE spacemaker

It may be that your magnetron is overheating, which will trip the magnetron's thermostat, which will interrupt power until it cools down a few minutes later.

Or it may be a defective magnetron causing electrical interference that disrupts the control circuit.

In order to help you, we need your full model number and some further information.

So please post a NEW question, and please include your brand name and the full model number from the tag in or on the unit, as well as the answers to these questions:

- How long does it cook before it shuts down?

- When it shuts down, does it go completely dead, or does it just stop with the display still lit?

- When you try to cook, do the inside light, turntable, and internal cooling fan all come on?

- Is it making any unusual noise?

- Is it louder or quieter than usual?

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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I have a GE microwave, model JVM 3670 BF03. It is an above the range unit. The unit still has power, the clock, turnstyle and fan work fine, but it no longer heats food.

HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

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Magic Chef MCO153UW

You absolutely need the magnetron cooling fan to be working, or the magnetron will be destroyed!

It is part # 3511800100 and you can order it for less than $20 here.

Far less than a magnetron.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Aug 28, 2008 | Microwave Ovens

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Oven stops after a few seconds

I like the information you give.
If the unit will work with the control Panel at a 45 degree angle it tells me you have a loose connection. The 45 degree angle puts enough pressure on the connection to keep it completed. With the Control Panel in it's normal position, the loose connection Heats and Opens the connection. After it cools connection is again made until it Heats up again. Remember Expansion, Contraction. I do not believe you have a Magnetron issue!! A Magnetron does not know if the Control Panel is at an angle.
Can you hear a slight "Click" when the unit shuts down? If so this is a relay opening. When you say you replaced the Control Board. Was this the Control Panel PC Board, or was it the Cook-Relay Control Board? A Door Switch not making solid contact can do this. Is your Door latching down solid? Check for loose connections, not open LOOSE.

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Ge md# 3670

well its one of two things . there is a tempture sw attached to the magntron that will turn it off if it overheats . so is it the magntron getting to hot because its going bad .or is it getting to hot because the fan blade and air vents are dirty ..... only you can tell that ( if its dirty ) but you will need to take it all apart to see . ... .my guess is that the mahntron is going bad , ge has the worst set up there i have ever seen GE is BAD NEWS when it comes to microwaves . want to have fun GOOGLE " ge spacemaker problems" , and see what pops up ,everthing from no heat to burning down a house !

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The first thing I would check would be the magnetron TCO (thermal cut-out). This is a little safety devise that protects the magnetron in the event of overheating. These can act up even without overheating. I believe the nuetral side of this TCO runs through the board, and therefore the flickering and shutdown. When the TCO cools, it resets. If it were the door switch, you would blow the fuse and wouldn't be able to set the time without changing the fuse. There are other cavity thermostats that could be the culprit but my quess is on the magnetron TCO. When working with microwaves always unplug the unit and discharge the capacitor. This is high voltage..Good Luck

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