Inverter NN-T551CB, Service Manual

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recommended to test the magnetron using the simple method outlined below.
Necessary equipment:
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1 litre beaker.
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Glass thermometer.
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Wrist watch or stop watch.
NOTE: Check the line voltage under load. Low voltage will lower the magnetron
output. Take the temperature readings and heating time as accurate as possible.
1. Fill the beaker with exactly one liter of tap water. Stir the water using the
thermometer and record the waters temperature (Record as T1).
2. Place the beaker on the center of the glass cook plate.
3. Operate the Microwave for 1 Minute on FULL power.
4. Stir the water again and read the temperature of the water. (Record as T2).
5. The normal temperature rise at the high power position for each model is shown in
the table. (Figure 2).
Figure 1