16
R - 2 0 4 E W A
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " EXPRESS DEFROST " pad once for 0.5lbs in weight.
(3) The oven is in Express Defrost cooking condition.
(4) The oven will operate as follows.
MENU
1ST STAGE
2ND STAGE
3RD STAGE
4TH STAGE
EXPRESS DEFROST
LEVEL
TIME
LEVEL
TIME
LEVEL
TIME
LEVEL
TIME
0.5lb
70%
57sec.
0%
57sec.
50%
32sec.
30%
45sec.
(5) 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 blocked 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. 3 of the 2 pin connector (A) and the
common 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. -13.5V D.C.
Oven lamp / Turntable motor / Cooling fan motor
RY2
Approx. -12.5V 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.
K
RELAY TEST
L
EXPRESS DEFROST TEST
M
FOIL PATTERN ON THE PRINTED WIRING BOARD TEST
1
2
3
4
5
6
7
8
9
0
POPCORN
START
POWER
LEVEL
TIMER
CLOCK
MINUTE
PLUS
FRESH
VEGETABLES
EXPRESS
DEFROST
ROLLS &
MUFFINS
DINNER
PLATE
BAKED
POTATOES
BEVERAGE
G 6
G 5
G 4
G 3
G 2
G 1
G 7
G 8
G 9
G10
STOP
CLEAR
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.
