Electrolux Icon E30SO75ESS - Control Unit; RELAY TEST

Troubleshooting and Testing
3-13
Procedure
Letter
V
Component Test
2. Control Unit
The following symptoms indicate a defective control unit.
2-1. In connection with pads.
a. When touching the pads, a certain group of pads do not produce a signal.
b. When touching the pads, no pads produce a signal.
2-2. In connection with indicators
a. At a certain digit, all or some segments do not light up.
b. At a certain digit, brightness is low.
c. Only one indicator does not light.
d. The corresponding segments of all digits do not light up; or they continue to light up.
e. Wrong figure appears.
f. A certain group of indicators do not light up.
g. The figure of all digits flicker.
2-3. Other possible problems caused by defective control unit.
a. Buzzer does not sound or continues to sound.
b. Clock does not operate properly.
c. Cooking is not possible.
When testing is completed,
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. Reconnect all leads removed from components during testing.
5. Re-install the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
RELAY TEST
1. Disconnect power supply cord, and remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin Nos. 1 and 9 of the 5 pin connector
(CN-D) on the control unit with an A.C. voltmeter. The meter should indicate 240 volts, if not
check oven circuit.
Shut-off, Cook and Heater Relays Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation, speed
grill, speed roast, speed bake, or convection cooking condition.
DC. voltage indicated ................ Defective relay.
DC. voltage not indicated .......... Check diode which is connected to the relay coil. If diode is good,
control unit is defective.