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R-1880LS/LST
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 tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between Pin No. 5 of the 3-pin connector (A) and the 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.
Relay 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.
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.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. 24.0V D.C. Oven lamp
RY2(COOK) Approx. 24.0V D.C. Power transformer / Stirrer mootor
RY3 Approx. 24.0V D.C. Heating element
RY4 Approx. 24.0V D.C. Turntable motor
RY5 Approx. 24.0V D.C. Fan motor
RY6 Approx. 24.0V D.C. Damper motor
RY7 Approx. 24.0V D.C. Convection motor
RY8 Approx. 24.0V D.C. Hood lamp
RY9 Approx. 24.0V D.C. Hood motor
RY10 Approx. 24.0V D.C. Hood motor (HIGH / LOW selection)
T TIMED 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 " DEFROST " pad four times.
3. Touch the number 5 pad.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
S 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.
4. Touch " START " pad.
5. The oven will operate as follows.
MENU WEIGHT 1ST STAGE 2ND STAGE 3RD STAGE
(LBS) LEVEL TIME LEVEL TIME LEVEL TIME
CHICKEN 0.5 70% 28sec. 50% 5sec. 30% 1min.28sec.
PIECES
6. If improper operation is indicated, the control unit is probably defective and should be checked.
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