Electrolux FGMO205KFA Service Manual page 31

Procedure
Letter
M
TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT
To determine if the sensor is defective, the simplest method is to replace it with a new replacement
sensor.
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Remove the AH sensor.
5. Install the new AH sensor.
6. Reconnect all leads removed from components during testing.
7. Re-install the outer case (cabinet).
8. Reconnect the power supply cord after the outer case is installed.
9. Reconnect the oven to the power supply and check the sensor cook operation as follows:
9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
9-2. Place the container on the center of tray in the oven cavity.
9-3. Close the door.
9-4. Press STOP/CLEAR, then touch timer/on-off pad once, the POWER LEVEL pad twice and touch
the START/ENTER pad once. Touch the NUMBER pad (1) once and the NUMBER pad (4) once.
9-5. The control panel is in automatic Sensor operation.
9-6. The oven turns off automatically, and the time for detecting moisture will be displayed.
If new sensor dose not operate properly, the problem is with the control unit, and refer to
explanation in checking the control unit.
CHECKING CONTROL UNIT
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the sensor connector that is mounted to control panel.
5. Then connect the dummy resistor circuit (see next page) to the sensor connector of control
panel.
6. Disconnect the leads to the primary of the power transformer.
7. Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
8. After that procedure, re-connect the power supply cord.
9. Check the sensor cook operation proceed as follows:
9-1. Press STOP/CLEAR, then touch TIMER/ON-OFF pad once, the POWER LEVEL pad twice and
touch the START/ENTER pad once. Touch the NUMBER pad (1) once and the NUMBER pad (4)
once.
9-2. The control panel is in the sensor cooking operation.
9-3. After approximately 25 seconds, push plunger of select switch for more than 3 seconds. This
condition is same as judgement by AH sensor.
9-4. After approximately 3 seconds, the display shows " X X . X X " which is the time for detecting
moisture.
If the above is not the case, the control unit is probably defective.
If the above is proper, the AH sensor is probably defective.
Continued on next page.
Section 3 Troubleshooting and Testing
Component Test
3-13