Microwave Drop-down Door Series
Microwave Drop-down Door Series
Troubleshooting
Troubleshooting
4-4
#826151 - Revision A - March, 2016
Microwave Output Power
Perform this test with the microwave fully assembled. Measure output power from the magnetron with a water
temperature rise test. Use this test to confirm proper performance after completing service repairs
Verify the microwave cavity is clean, and that the supply voltage is about 117 VAC.1
Fill a measuring cup with 16 oz (473 ml) of tap water and measure the water temperature. Stir the tempera-2
ture sensor in the water until the temperature is stabilized.
Place the measuring cup in the center of the microwave. Turn on the microwave on High for 75 seconds.3
Use a watch to time 60 seconds after the microwave starts to emit microwave energy. This is about 5 sec-4
onds after start is pressed.
Remove the measuring cup and measure the water temperature. Stir the temperature sensor in the water5
until the temperature is stabilized.
Subtract the initial cold water temperature from the hot water temperature. The normal result is 22° F to 43°6
F (12.2° C to 23.8° C) rise in temperature.
If the water temperatures are accurately measured and tested for the required time period the test results7
will indicate
a. If the magnetron has lower power output (closer to 22° F) cooking time is extended
b. If the magnetron has higher power output (closer to 43° F) cooking time is reduced
c. Because cooking time can be adjusted to compensate for power output, the magnetron assembly should
be replaced only if the water temperature rise test indicates a power output well beyond the normal limits.
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