LG Electronics LRMM1430SB, LRMM1430SW manual No microwave oscillation

Page 31

(TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly)

CONDITION

No microwave oscillation.

CHECK

Disconnect the wire leads from relay and check continuity of relay. (Operate the unit)

RESULT

No continuity.

Continuity.

CAUSE

Defective PCB assembly.

Replace Inverter and Magnetron.

REMEDY

Replace PCB assembly.

NOTE : • Make sure the wire leads correct position.

•When Removing the lead wires from the parts, be sure to grasp the connector, not the wires.

•When removing the magnetron, be sure to install the magnetron gasket in the correct position and in good condition.

Output is full power when you set lower power level.

Disconnect the lead wires from

relay and check continuity relay . (Operate the unit)

Abnormal.

Defective PCB assembly.

Replace PCB assembly.

-30-

Image 31

Contents Microwave Oven Page Model LRMM1430SW LRMM1430SB Test the Latch and Switch Sequence Adjustment ProceduresCheck the Door Latch and Switch Closings Adjust the Latch and Switch ClosingsPage Trial Operation Precautions on InstallationFeatures and Specifications General Precautions in USESwitch Chart SpecificationsOverall Circuit Diagram A. Schematic Diagram Matrix Circuit for Touch KEY Board Operating Procedures A. Control Panel Clock Display WindowMULTI-STAGE Cooking Easy USE Chart ClockHI-POWER Cooking Kitchen TimerMeasurement with the OUT Case Removed Procedure for Measuring Microwave Energy LeakageEquipment Measuring Microwave Energy LeakageRecord Keeping and Notification After Measurement Measurement with a Fully Assembled OvenImportant Notes Disassembly InstructionsRemoving Control Circuit Board Figure WireAIR Guide Removal Figure Removing the Turntable Motor Magnetron RemovalInterlock System FAN Motor Assembly RemovalInterlock Mechanism Components Test Procedure Results Primary Interlock Switch TestSecondary Interlock Switch Test Monitor Switch TestMagnetron Test and Checkout PROCEDURES, and TroubleshootingTest Procedures Components InverterCorrect Position SensorFAN Motor RelayTurntable Motor Checkout Procedures for Fuse Blowing Checkout ProceduresProblems Causes YES Good Checkout Procedures for RelayProblem a Problem BPage Condition Cause Remedy Trouble ShootingCheck ConditionResult PCB Check ResultCause Remedy Condition Check ResultNo microwave oscillation Exploded View Door Parts Controller Parts Oven Cavity Parts Latch Board Parts Oven Interior Parts Base Plate Parts For Model LRMM1430SB Replacement Parts ListScrew 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