Electrolux PLMV169DCC Service Manual page 23

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PROCEDURE
LETTER
M RELAY TEST
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 leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 7 of the 4 pin connector (A) and the
RY1 and RY2 Relay Test
8. Disconnect the power supply cord, and then remove outer case.
9. Open the door and block it open.
10.Discharge high voltage capacitor.
11.Reconnect all leads removed from components during testing.
12.Re-install the outer case (cabinet).
13.Reconnect the power supply cord after the outer case is installed.
14.Run the oven and check all functions.
N COMPU DEFROST TEST
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " Auto Defrost " pad twice and touch the Number pad "5". And then touch the
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
O FOIL PATTERN ON THE PRINTED WIRING BOARD TEST
To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on the
PWB, this foil pattern acts as a fuse.
1. Foil pattern check and repairs.
TEST PROCEDURES
tape.
common terminal of the relay RY1 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated .................... Defective relay.
DC. voltage not indicated .............. Check diode which is connected to the relay coil. If diode is good,
RELAY SYMBOL OPERATIONAL VOLTAGE
RY1 Approx. 24.0V D.C.
RY2(COOK) Approx. 24.0V D.C.
RY3 Approx. 24.0V D.C.
RY4 Approx. 24.0V D.C.
RY5 Approx. 24.0V D.C.
"START" pad.
WEIGHT 1ST STAGE
LEVEL
0.5lbs 70% 30sec.
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) Follow the troubleshooting guide given below for repair.
COMPONENT TEST
control unit is defective.
2ND STAGE
TIME LEVEL TIME
50% 30sec.
21
CONNECTED COMPONENTS
Oven lamp / Fan motor / Stirrer motor
Power transformer
Turntable motor
Hood motor
Hood motor (HIGH /LOW selection)
3RD STAGE 4TH STAGE
LEVEL TIME LEVEL
40% 30sec. 30%
PLMV169DCC
TIME
30sec.