On Tue, 3 Mar 2009 15:57:41 -0800 (PST), Mike WB2MEP
put finger to keyboard and composed:

On Mar 3, 2:28*pm, Franc Zabkar wrote:

I'm wondering if inverter microwaves are any less reliable than
traditional transformer/capacitor types.

There were several threads on SER a few years ago when Panasonic
first came out with the Inverter oves, about failures of the Inverter
circuit. At that time, Panasonic wouldn't sell replacement parts for
the Inverter power supply, or even provide a part number for the
switching trasistors that were failing. You had to replace the whole
power supply, which cost almost as much as a new oven.

The service manual for the NN-C2000 you linked to does have a parts
list for the Inverter board, so maybe they are considered repairable
now.

The transistors are now offered as "A691E4V10GP Transistor Kit Series
2".

Here are the datasheets for the GT30J322 (75W) and GT60M303 (170W)
IGBTs:
http://www.toshiba.com/taec/componen...//361/4133.pdf
http://www.toshiba.com/taec/componen...//361/4169.pdf

The oven has a rated output of 1100W. If the SMPS has an efficiency of
90%, then I expect that the transistors would be dissipating around
100W between them, although the mass of the heatsink appears
relatively small for such a high heat load.

- Franc Zabkar
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