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PROCEDURE
LETTER
Shut-off, Cook and Heater Relays 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 or convection
cooking condition.
. voltage indicated ............... Defective relay.
DC
DC. voltage not indicated ........... Check diode which is connected to the relay coil. If diode is good,
RELAY SYMBOL
RY1
RY2 (COOK)
RY3 (HEATER)
RY4
RY5
RY6
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.
T
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, touch the Compu Defrost pad twice and touch the number pad 5. And then touch the start
pad.
(3) The oven is in Compu Defrost cooking condition.
(4) The oven will operate as follows
WEIGHT
0.5lbs
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
U
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN.
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.
1. Foil pattern check and repairs.
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) Follow the troubleshooting guide given below for repair.
STEPS
1
2
5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with
a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately
175Ω ± 10%). If any abnormal condition is detected, replace the defective parts.
TEST PROCEDURES
control unit is defective.
OPERATIONAL VOLTAGE
Approx. 19.0V D.C.
Approx. 18.0V D.C.
Approx. 18.0V D.C.
Approx. 19.0V D.C.
Approx. 19.0V D.C.
Approx. 19.0V D.C.
1ST STAGE
2ND STAGE
LEVEL
TIME
LEVEL
70%
47sec.
0%
OCCURRENCE
Only pattern at "a" is broken.
Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".
COMPONENT TEST
CONNECTED COMPONENTS
Oven lamp / Turntable motor
Power transformer
Heating element
Damper motor
Convection motor
Cooling fan motor
3RD STAGE
TIME
LEVEL
TIME
52sec.
50%
32sec.
CAUSE OR CORRECTION
*Insert jumper wire J1 and solder.
21
R-930AK-F
R-930AW-F
4TH STAGE
LEVEL
TIME
30%
40sec.
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