KitchenAid Whirlpool W11400254 Service Manual page 39

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Components
AC Line Filter
2
1
U
3
1 2
L N
4
3 4
POWER OUTPUT MEASUREMENT
The power output of the magnetron can be measured using the following "Voltage Measurement at Power Source" and "Output Test"
sections. Before you perform the test:
n n Make sure that the oven cavity is cool and clean. Make sure that the oven cavity is cool and clean.
n n Check the line voltage at the wall outlet while microwave Check the line voltage at the wall outlet while microwave
oven is operating. See the "Voltage Measurement at Power oven is operating. See the "Voltage Measurement at Power
Source" section. Source" section.
Tools Needed
n n 2-cup measuring cup
2-cup measuring cup
n n Thermometer
Thermometer
n n Voltmeter/ohmmeter Voltmeter/ohmmeter
Voltage Measurement at Power Source
1. Fill the measuring cup with 2 cups (500 mL) of tap water.
2. Place in the center of the microwave oven cavity.
3. Operate the microwave oven on high power for 1 minute.
4. While the microwave oven is operating, measure the
line voltage at the power source. See "Measure Voltage"
illustration.
5. Verify the voltage is constant during microwave oven
operation. If voltage drops below 108 V, contact a qualified
electrician to check your electrical supply.
6. Make note of the voltage while the microwave oven is
running and proceed to the output test.
Output Test
1. Fill the measuring cup with 2 cups (500 mL) of 70°F (21°C)
tap water.
2. Stir the water with the thermometer to ensure uniform
temperature. Add warm or cool water to bring the water to
the correct temperature.
3. Place the measuring cup in the center of the microwave
oven cavity.
4. Operate the microwave oven on high power for 1 minute.
5. Remove the measuring cup and stir the water with the
thermometer for about 20 seconds.
6. Record the temperature of the water.
7. Refer to the model serial tag on the microwave oven to
acquire wattage output rating of the microwave oven.
For Service Technician Use Only
Test/Results
1. Unplug microwave oven or disconnect power.
2. Remove wire leads.
3. Measure resistance:
n Normal: 1-3 (coil): Less than 1 ohm; 2-4 (coil): Less than 1 ohm;
3-4 (resistor): 550 k-800 k ohms
n Abnormal: Infinite
COMPONENT TESTING (Cont.)
Measure Voltage
A
B
C
A. House power supply wall outlet
B. Voltmeter/ohmmeter test leads
C. Microwave oven plug
8. Using the following chart, determine if the output of the
microwave oven is within the range listed based on the line
voltage and wattage rating of the microwave oven.
Water Temperature for Line Voltage and Wattage Rating
700 W
Voltage
120 V
96°F to 102°F
(36°C to 39°C)
108 V
91°F to 97°F
(33°C to 36°C)
Microwave Hood Combination
1000 W 1200 W
110°F to 116°F 124°F to 130°F
(43°C to 47°C) (51°C to 54°C)
101°F to 107°F 111°F to 117°F
(38°C to 42°C) (44°C to 47°C)
n
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