17
R- 520JK
R-520JW
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
MENU
1ST STAGE
2ND STAGE
STEAKS/CHOPS
LEVEL
TIME
LEVEL
TIME
0.5lb
60%
58sec.
40%
22sec.
(6) If improper operation is indicated, the control unit is probably defective and should be checked.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT 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,
control unit is defective.
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
Approx. 12.0V D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
Approx. 12.0V D.C.
Power transformer
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
Key Unit
K
RELAY TEST
G10
G11
G12
G13
G9
G8
G7
G6
G5
G4
G3
G2
G1
9
3
6
2
5
8
0
1
4
7
TIMER
CLOCK
RICE
POPCORN
MINUTE PLUS
START
STOP
CLEAR
BAKED
POTATOES
SENSOR
REHEAT
FROZEN
ENTREES
HOT
WATER
GROUND
MEAT
(SENSOR COOK)
FRESH
VEGETABLES
FROZEN
VEGETABLES
POWER
LEVEL
CUSTOM
HELP
NIGHT
LIGHT
KEEP WARM
PLUS
FISH
SEAFOOD
FROZEN
ROLLS/
MUFFINS
GROUND
MEAT
(DEFROST)
STEAKS/
CHOPS
BONE-IN
POULTRY
FRESH
ROLLS/
MUFFINS
BONELESS
POULTRY
CHICKEN
BREAST
BEVERAGE
Pin
NO. G1
Pin
NO. G13
Key unit ribbon cable
Key unit (Membrane Switch) front view
