LG Electronics LRMM1430SW, LRMM1430SB Checkout Procedures for Fuse Blowing, Problems Causes

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B.CHECKOUT PROCEDURES

(1)CHECKOUT PROCEDURES FOR FUSE BLOWING

CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE.

PROBLEMS

 

CAUSES

 

 

 

 

Fuse blows immediately after

 

 

 

 

Improper operation of the primary interlock,

 

the door is closed.

 

 

 

 

secondary interlock switches and/or the interlock

 

 

 

 

Fuse blows immediately after

 

monitor switch.

 

the door is opened.

 

 

 

 

 

 

 

Fuse blows when the door is closed and START key

 

Malfunction of the Inverter, the magnetron,

 

is touched.

 

the fan motor or the circuit board.

 

 

 

 

 

 

 

 

 

NOTES:

-If the fuse is blown by an improper switch operation, replace the defective switches and the fuse at the same time. After replacing the defective switches with new ones, make sure that they are correctly connected.

-Check for microwave energy leakage according to “1. ADJUSTMENT PROCEDURES” on page 3, when the primary interlock, secondary interlock switches and/or the interlock monitor switches are adjusted or replaced.

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Contents Microwave Oven Page Model LRMM1430SW LRMM1430SB Adjustment Procedures Check the Door Latch and Switch ClosingsAdjust the Latch and Switch Closings Test the Latch and Switch SequencePage Precautions on Installation Features and SpecificationsGeneral Precautions in USE Trial OperationSpecifications Switch ChartOverall Circuit Diagram A. Schematic Diagram Matrix Circuit for Touch KEY Board Operating Procedures A. Control Panel Display Window ClockEasy USE Chart Clock HI-POWER CookingKitchen Timer MULTI-STAGE CookingProcedure for Measuring Microwave Energy Leakage EquipmentMeasuring Microwave Energy Leakage Measurement with the OUT Case RemovedMeasurement with a Fully Assembled Oven Record Keeping and Notification After MeasurementDisassembly Instructions Important NotesWire Removing Control Circuit Board FigureAIR Guide Removal Figure Magnetron Removal Removing the Turntable MotorFAN Motor Assembly Removal Interlock SystemInterlock Mechanism Primary Interlock Switch Test Secondary Interlock Switch TestMonitor Switch Test Components Test Procedure ResultsTest and Checkout PROCEDURES, and Troubleshooting Test Procedures ComponentsInverter MagnetronSensor Correct PositionRelay FAN MotorTurntable Motor Checkout Procedures Checkout Procedures for Fuse BlowingProblems Causes Checkout Procedures for Relay Problem aProblem B YES GoodPage Trouble Shooting Condition Cause RemedyCondition CheckResult Check Result PCBCondition Check Result Cause RemedyNo microwave oscillation Exploded View Door Parts Controller Parts Oven Cavity Parts Latch Board Parts Oven Interior Parts Base Plate Parts Replacement Parts List For Model LRMM1430SBScrew TAPPING,PAN Head For Model LRMM1430SW WTT022 1TTL0402422 Schematic Diagram of P.C.B Printed Circuit Board B. Parts List LOC Description Specification SVC Alter RY1 May