Question about Panasonic NN-T888S Convection/Microwave Oven
Unit stopped working completely. Not even the clock. I found a 15amp 125v fuse inside the cabinet (right rear) Replaced that and bake/broil works fine, but microwave blows the fuse immediately. Any thoughts? This unit has only had about five hours of use total, but is three years old.
Be very careful! Standard microwaves have 2100volt capacitors and commercial ones 4000 volt capacitors.
*Decharge your capacitor(s) before doing diagnostics*.
You are now testing the high voltage side (as it works on convection). The main components are a transformer, a capacitor, a diode and a magnetron (havent seen a triac in a panasonic residential). If you have a proper meter that can test uf, decharge the capacitor, then test the capacitor, if it reads 0, you need a new capacitor (10$ used typically, 14$ new from ebay). To test the magnetron, decharge the capacitor first, remove the spade connections, test each leg to the frame of the microwave... if it shows measurable resistance, the magnetron is bad. The transformer is not something you test as I personally dont have a 4000 volt meter. If the diode, the magnetron and capacitor are okay, then the transformer is bad. To eliminate any other function, disconnect the low voltage to the transformer run a micropower cycle and check the fuse.
Hope that helps. My first instinct is the capacitor.
Posted on Dec 19, 2009
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Posted on Jan 02, 2017
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