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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Posted on Jan 02, 2017

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Your Microvawe is probably shoreted internally. Best case scenario, it has an internal fuse but circuits might have suffered.
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Hi and welcome to FixYa, I am Kelly

Often it is a simple part replacement. There are 4 parts that can usually cause this.
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- 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.
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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.

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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.

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5. Check resistance of the magnetron thermostat.
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8. Check wiring to the 1100W inverters and control system. See
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16. Plug in microwave oven or reconnect power.
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