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PROCEDURE
LETTER
Pin
Pin
NO. G1
NO. G13
Key unit (Membrane Switch) front view
K
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
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between the normal open terminal of the relay RY1 and the
normal open terminal of the relay RY2 on the control unit with an A.C. voltmeter.
The meter should indicate 120 volts, if not check oven circuit.
RY1 and RY2 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,
RELAY SYMBOL
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.
L
COMPU DEFROST TEST
WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door.
(3) Touch the " STEAKS / CHOPS " pad once.
(4) The oven is in Defrost Center cooking condition.
(5) The oven will operate as follows
STEAKS/CHOPS LEVEL
(6) If improper operation is indicated, the control unit is probably defective and should be checked.
TEST PROCEDURES
KEEP WARM
VEGETABLES
Key unit ribbon cable
Key Unit
OPERATIONAL VOLTAGE
RY1
Approx. 12.0V D.C.
RY2
Approx. 12.0V D.C.
MENU
1ST STAGE
TIME
0.5lb
60%
20sec.
17
COMPONENT TEST
G8
G7
G6
G5
5
FROZEN
POWER
BONE-IN
0
ROLLS/
POULTRY
MUFFINS
LEVEL
GROUND
FRESH
STOP
MEAT
ROLLS/
CLEAR
(DEFROST)
MUFFINS
PLUS
STEAKS/
FRESH
FROZEN
ENTREES
CHOPS
FISH
SENSOR
NIGHT
BONELESS
SEAFOOD
REHEAT
POULTRY
LIGHT
control unit is defective.
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
2ND STAGE
LEVEL
TIME
LEVEL
40%
20sec.
30%
G4
G3
G2
4
3
2
9
8
7
CUSTOM
BAKED
RICE
MINUTE PLUS
POTATOES
HELP
GROUND
CHICKEN
POPCORN
MEAT
BREAST
(SENSOR COOK)
FROZEN
BEVERAGE
VEGETABLES
3RD STAGE
TIME
45sec.
R-428JK
R-428JW
G1
1
6
START
TIMER
CLOCK
HOT
WATER
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