22
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
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.
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
rotom elbatnruT / pmal nevO.C.D V0.91 .xorppA1YR
RY2 (COOK) Approx. 18.0V D.C. Power transformer
RY3 (HEATER) Approx. 18.0V D.C. Convection heater
rotom repmaD.C.D V0.91 .xorppA4YR
rotom noitcevnoC.C.D V0.91 .xorppA5YR
Fan motor.C.D V0.91 .xorppA6YR
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.
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 1ST STAGE 2ND STAGE 3RD STAGE 4TH STAGE
LEVEL TIME LEVEL TIME LEVEL TIME LEVEL TIME
0.5lbs 70% 47sec. 0% 52sec. 50% 32sec. 30% 40sec.
(5) If improper operation is indicated, the control unit is probably defective and should be checked.
T COMPU DEFROST TEST
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 OCCURRENCE CAUSE OR CORRECTION
1 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.
2 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".
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.
U PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING BOARD
(PWB) IS OPEN.
SMC1585BSA
SMC1585BBA
SMC1585BWA
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