Question about Microwave Ovens

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I have a Panasonic microwave NN T573. It's great and everything works as new except the door opening mechanism has been deteriorating for some weeks .. then I have to pull the door as I push the button (which lost its positive feel a while ago) .. now it won't open at all. I am reasonably competent diy (done a few fixes on cars, ovens etc.) but cannot see any obvious way to get to the mechanism - I assume that I can buy the part online. Also a bit nervous reading about high charge capacitors!!!!! Any help please guys?

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  • broken5746 Sep 11, 2010

    Sorry but I feel very uneasy about discharging capacitors through a pair of pliers - I am happy to leave it unplugged for a couple of days? Or, is there a better way to discharge them .. surely they have to be discharged slowly to avoid a damagingly high current?

  • broken5746 Sep 11, 2010

    thnaks caroldan .. sounds like good tips here. I am going to leave for a discharge then dismantle it. Also I need to order the new part. I'll come back when I have fixed (or not!). Thanks for now.

  • broken5746 Sep 11, 2010

    Thanks for that. I will allow discharge, dismantle and order a new part. I will get back to you when good or if I meet a problem. Thanks for now.

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  • Master
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Usually you will have to take the top cover off and use a screw driver to release the spring in the switch assembly holding the door latch.

I would suggest you browse the material at this site to become familiar with the appliance.

I am assumng you are based in the UK or Europe as this model of the microwave is not very common in USA.

Browse this site for the door mechanism related spares that you may need.

In case you do not have a user manual (not much help for this problem) you can get it from here.

Hope all this helps. When working with microwave ovens always make sure you turn the mains swich off and wait for 5-6 minutes and then take out the plug. This way you will ensure the high voltage capacitors are discharged before touching. Also wear insulated footwear.

Hope you are able to fix the door problem soon.

Posted on Sep 12, 2010

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  • Microwave Ovens Master
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The door mechansim with the latch is with a limit switch that must be reset when the door is locked. The connectiion to the trigger in the mechanism through these spring loaded switches is needed to switch the microwave.... only when the door is latched.
So remove the front panel and check the locks. Use a good degreaser to was off dirt.
Now remove and reset the switch mechansim , test the continuity.
Not to worry about high voltage only if touch them. But take precaution to keep away from the magnetron when the set is on for testing with a cup of water.
Use your logic( being a DIY) to see the latch and reset.
Use a screw driver from within to trip offf the door to unlock

Posted on Sep 11, 2010

  • Donald DCruz
    Donald DCruz Sep 12, 2010

    Even with a longer duration some ccharge may remain so use a wire to short off.Take care

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  • Microwave Ovens Master
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Yes , the tension in the capacitors is extremely high but if you wait a day with it unplugged then try to start it (still unplugged) then they will be discharged. To be absolutely sure you can discharge them manually without the waiting period - just jump the plots of the capacitor with a very well insulate pair of pliers.
Once that is done just dismantle the unit completely and access the door latch (you will need to remove the face for that); if you can fix it then that's it. If not then you can order a replacement part from Panasonic or find a used one in a repair shop.

Posted on Sep 11, 2010

  • Azrael SRL Sep 11, 2010

    Sure, leaving them two days will  also discharge them to safe levels. But, as i said, by using a pair of well insulated pliers will save you some time and make it absolutely sure - this is why you should do it even after the waiting. Discharging them quickly  doesn't to any harm to them - it will just make a big , loud, spark. To avoid the spark (and scare the customer) i use a wire with a big resistance on it.

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