Question about Panasonic NN-H664 Microwave Oven

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Where is the fuse?

My micro oven just suddenly go non-operational, the power is totally gone. I have to check whether the fuse has jumped, but failed to find the fuse, and failed when tried to open the back of the micro oven.. any help is REALLY appreciated..

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The fuse is internal and you will have to remove the cover to be able to access it. Unplug the unit. Once you remove the cover, follow where the power cord goes into the unit. The fuse should be in that area. Replace the fuse with the EXACT value of that of the original one.

If the fuse blows again when you put the cover back on and turn it on, then this indicates that you have a problem in the power supply or with the magenetron.

Please let me know if I can be of further assistance to you.

Good luck!
- Jim

Posted on Feb 13, 2008

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My sharp R-352DC Microwave won't heat, and turntable doesn't turn, also the display does not work. Please tell me the problem?


It sounds like power to the circuit board might be interrupted, but data on non-US models is limited.

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Micro will not operate fuse was blown so I jumped out fuse and still no power


Your Microvawe is probably shoreted internally. Best case scenario, it has an internal fuse but circuits might have suffered.
If you are not properly a Microwave orven technician and you don't have the proper testers, you should take it to a repair service to get it diagnosed, it it can be repaired for a reasonable cost.

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GE JE1160 1100 Watts Microwave Oven seems to have no power. The wall outlet tests ok but the microwave appears dead. It worked fine yesterday.


Hi and welcome to FixYa, I am Kelly

Often it is a simple part replacement. There are 4 parts that can usually cause this.
- The Fuse fails as a result of another component failure
- The most common failure is the power diode. You remove the chassis to gain access and then make sure you hold a screwdriver by the HANDLE and ground the large capacitor at least 3 times across the terminals. Then you can check the diode by using an ohm meter across the terminals. It should read continuity in one direction only. (reverse lead polarity) If it reads in both directions OR there is no continuity then the diode has failed.
- Next you test the high voltage capacitor by reversing the leads and watching each time for a jump in resistance then the meter returns to infinity. (Diode must be disconnected) No jump in resistance after reversing the test leads or constant resistance = bad capacitor.
- Lastly the Magnetron could have failed. You read resistance of the leads of the Magnetron with one lead disconnected. You must read resistance. No resistance = bad magnetron

I used model JE1160WD001 as an example since you did not include a complete model number. However, the parts I am referring to are common to all JE1160 models.

All parts except the fuse can be found here:
http://www.appliancepartspros.com/partsearch/model.aspx?model_id=212857

The fuse should be a 15 Amp 125 VAC Slo-Blow Fuse. Available at any hardware or Appliance parts source.

A failed door interlock switch will cause the fuse to immediately fail if the micro-switch fails in the door open position.

This is a pretty simple microwave and you should be able to bring it back to life. Just keep in mind repair parts costs vs replacement if you have failed magnetron.

Thanks for choosing FixYa,
Kelly

Jan 22, 2011 | GE JE1160 Microwave Oven

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My microwave is 4 years old. It stopped heating about 2 years ago. The light works, the microwave timer works, the microwave itself will turn on, but it won't heat anything. Could this be a simple part...


Hi and welcome to FixYa, I am Kelly
Often it is a simple part replacement. There are 3 parts that can cause this. The most common failure is the power diode. You remove the chassis to gain access and then make sure you hold a screwdriver and ground the large capacitor at least 3 times across the terminals. Then you can check the diode by using an ohm meter across the terminals. It should read continuity in one direction only. (reverse lead polarity) If it reads in both directions OR there is no continuity then the diode has failed. Next you test the high voltage capacitor by reversing the leads and watching each time for a jump in resistance then the meter returns to infinity. (Diode must be disconnected) No jump in resistance after reversing the test leads or constant resistance = bad capacitor. Lastly the Magnetron could have failed. You read resistance of the leads of the Magnetron with one lead disconnected. You must read resistance. No resistance = bad magnetron.

Since you did not include a model number this response assumes you have a non-inverter powered unit. If you need more specific information or have an inverter powered microwave I need a complete model number in your response so I can pass on parts sources and unit specific checks.

Thanks for choosing FixYa,
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Built-in Sharp Carousel II Microwave Convection Oven died.


There are a couple of safety thermostats in the oven to shut down power if something overheats. One is on the magnetron tube (the microwave source), the other is on the cooking cavity. These sometimes go bad. There's also a power line fuse that may have failed, or become loose in its mounting clips. These can be tested with an ohmmeter; they should all measure very close to zero ohms if they're good.

Another possibility is that the control circuit board in the oven may have failed. I have worked on several Sharp ovens where the power transformer for the board has gone bad for no good reason. If the board goes bad the oven may appear to be dead as well.

Microwave servicing is best left to professionals. If you're thinking of keeping this one, take it to a service shop (or call for home service) and get an estimate. Then decide whether to repair or replace.

Hope this has helped a little. Thanks for using Fixya!

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Aug 18, 2009 | Whirlpool MH1150XM Convection/Microwave...

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TOTALLY DEAD


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Microwave F-7 Code


F7 is q Power to magnetron
interrupted

1. Unplug microwave oven or disconnect power.
2. After 40 seconds, check to see whether this solves the problem.
3. Unplug microwave oven or disconnect power.
4. Check cooling fan operation
5. Check resistance of the magnetron thermostat.
6. Check the magnetron.
7. Check P2, P4 and P27 connections.
8. Check wiring to the 1100W inverters and control system. See
“Checking Inverters.”
9. Check operation of all interlock switches.
10. Replace inverter, if defective.
11. Replace all parts and panels before operating.
12. Plug in microwave oven or reconnect power.
13. If problem persists, unplug microwave oven or disconnect power.
14. Replace electronic control.
15. Replace all parts and panels before operating.
16. Plug in microwave oven or reconnect power.
17. If problem persists, unplug microwave oven or disconnect power.
18. Check for reversed plug connection on controls or loose wiring.
19. Replace all parts and panels before operating.
20. Plug in microwave oven or reconnect power.

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