Microwave Drop-down Door Series
Microwave Drop-down Door Series
Troubleshooting
Troubleshooting
4-10
#826151 - Revision A - March, 2016
To determine if the sensor operation is defective, the simplest method is1
to replace the sensor with a new sensor.
Perform 3E Checks (page 4-2)2
Remove the AH Sensor3
Install a new AH Sensor4
Perform 4R Checks (4-2) except for testing for microwave power.5
After the microwave is plugged in for two minutes perform the Water6
Load Cooking Test for AH Sensor.
Measure the resistance from terminal F1 to F3. At 77° F resistance7
should be 4 kOhms
Measure the resistance from terminal F2 to F3. At 77° F resistance8
should be 2 - 4 kOhms
Measure the resistance from terminal F1 to F2. At 77° F resistance9
should be 5 - 7 kOhms
If the turntable motor, high voltage transformer, or fan motor is not operating,
and live voltage test shows no voltage at the component, test the power to the
control board.
Perform 3E Checks (page 4-2)1
Disconnect and isolate the wires to the primary side of the high voltage2
transformer
Remove CN-A from the control board and connect voltmeter to pins 1 and 33
Close the oven door4
Enter three minutes on the touch pad and energize the microwave, and5
observe voltage
Perform 3E Checks (page 4-2)6
Remove voltmeter leads, and connect CN-A to the control board7
Connect wires to the primary side of the high voltage transformer8
If line voltage was observed and the turntable motor, high voltage trans-9
former, and fan motor resistance measures correctly, replace the control
unit.
NOTE: If the other motors are working it is assumed there is voltage to the control
unit.
TESTING METHOD FOR AH
SENSOR
RELAY TEST
TEST
PROCEDURE
COMPONENT TEST
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