TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
NRELAY 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,
7.Remove the outer case and check voltage between Pin No. 7 of the 4 pin connector (A) and the common terminal of the relay RY1 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.
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| RY1 |
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| Approx. 24.0V D.C. |
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| Oven lamp / Fan motor / Stirrer motor |
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| RY2(COOK) |
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| Approx. 24.0V D.C. |
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| Power transformer |
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| RY3 |
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| Approx. 24.0V D.C. |
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| Turntable motor |
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| RY4 |
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| Approx. 24.0V D.C. |
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| Hood motor |
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| RY5 |
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| Approx. 24.0V D.C. |
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| Hood motor (HIGH /LOW selection) |
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| 8.Disconnect the power supply cord, and then remove outer case. |
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| 9.Open the door and block it open. |
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| 10.Discharge high voltage capacitor. |
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| 11.Reconnect all leads removed from components during testing. |
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| 13.Reconnect the power supply cord after the outer case is installed. |
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| 14.Run the oven and check all functions. |
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O | COMPU DEFROST TEST |
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| (1) Place one cup of water in the center of the turntable tray in the oven cavity. |
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| (2) Close the door, touch the " COMPU DEFROST " pad once and touch the Number pad "1" and touch | ||||||||||||||||||
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| the Number pad "5". And then touch the "START" pad. |
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| (3) The oven is in Compu Defrost cooking condition. |
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| (4) The oven will operate as follows |
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| WEIGHT |
| 1ST STAGE |
| 2ND STAGE | 3RD STAGE | 4TH STAGE |
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| LEVEL | TIME |
| LEVEL |
| TIME | LEVEL | TIME | LEVEL |
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| 0.5lbs |
| 70% | 35sec. |
| 0% |
| 40sec. | 50% | 30sec. | 30% |
| 35sec. |
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| (5) If improper operation is indicated, the control unit is probably defective and should be checked. | ||||||||||||||||||
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P | FOIL PATTERN ON THE PRINTED WIRING BOARD TEST |
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| 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. |
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| 1. Foil pattern check and repairs. |
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| 1) Disconnect the power supply cord, and then remove outer case. |
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| 2) Open the door and block it open. |
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| 3) Discharge high voltage capacitor. |
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| 4) Follow the troubleshooting guide given below for repair. |
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