Troubleshooting and Testing
3-9
Procedure
Letter
L
M
Component Test
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. (See Warnings and Instructions on page 3-1)
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 #7 and 9 of the 9- pin connector (A) on
the control unit with an A.C. voltmeter. The meter should indicate 120 volts, if not, check the
oven circuitry.
Shut-off, Cook and Heater Relay Test
These relays are operated by DC voltage.
Check voltage at the relay coil with a DC voltmeter during the microwave cooking operation or con-
vection 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.
8. If any abnormal condition is detected, replace the control unit.
9. Disconnect the power supply cord and then remove outer case.
10. Open the door and block it open.
11. Discharge high voltage capacitor. (See Warnings and Instructions on page 3-1)
12. Reconnect all leads removed from components during testing.
13. Re-install the outer case (cabinet).
14. Reconnect the power supply cord after the outer case is installed.
15. Run the oven and check all functions.
AUTO 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 and touch the Number pad “2”, then “2” again,
then “0” (2 = Steaks & Chops, 2,0 = 2.0lbs). Touch the “START” pad.
3. After 2 seconds, the oven is in AUTO 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.
RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS
RY1 Approx. 2.5V D.C. Oven lamp / Turntable motor
RY2(COOK) Approx. 2.4V D.C. Power transformer
RY6 Approx. 2.5V D.C. Cooling fan motor
WEIGHT 1ST STAGE 2ND STAGE 3RD STAGE
LEVEL TIME LEVEL TIME LEVEL TIME
2.0lbs 70% 47sec. 50% 32sec. 30% 40sec.
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