LG Electronics MS3447GRS Setting time Check continuity, Defective Replace, Secondary switch

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(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched.

CONDITION

CHECK

RESULT

1.Setting time

Check continuity

No continuity.

does not count

of secondary

 

down when

switch (with

 

touching START

door closed).

Continuity.

pad.

 

 

 

 

Check the con-

Continuity

 

nection between

 

 

CN1 connector

 

 

and PCB

No continuity

 

assembly.

 

CAUSE

 

 

REMEDY

 

 

 

 

 

 

 

 

Defective

 

 

Replace

secondary switch.

 

 

secondary switch.

 

 

 

 

Defective PCB

 

 

 

Replace PCB

assembly.

 

 

assembly.

 

 

 

 

 

 

 

 

 

 

Loose connection.

 

 

Connect them

 

 

tightly.

 

 

 

 

 

 

 

 

 

2.Fan motor or oven lamp do not turn on.

Check fan motor.

Check oven lamp.

Abnormal.

Abnormal.

Normal.

Defective fan motor.

Defective oven lamp.

Replace fan motor.

Replace oven lamp.

(TROUBLE 4) Oven seems to be operating but little heat is produced in oven load.

CONDITION

 

CHECK

 

RESULT

 

CAUSE

 

 

 

 

 

 

 

REMEDY

Output is low.

Check the

 

 

Lower than 90% of

 

power source

 

 

rating voltage.

 

voltage.

 

 

 

 

 

 

 

 

 

 

 

 

Normal.

Disconnect the

Abnormal.

wire leads from

 

relay 2 and

 

check on and off

Normal.

time with

 

multitester.

 

Decrease in power source voltage with load.

Defective PCB assembly.

Suggest customer contact local electric power utility co. or qualified electrician.

Replace PCB assembly.

Measure the

 

 

 

 

 

 

 

 

 

 

 

 

Defective

 

Abnormal.

 

output power.

 

 

 

 

magnetron.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace magnetron.

NOTE: Simple test of power output-conducted by heating one liter water for one min. if available. Minimum 8.5˚C temperature rise is normal condition.

Copyright © 2007 LG Electronics. Inc. All right reserved.

5-14

LGE Internal Use Only

Only for training and service purposes

 

 

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Contents Microwave Oven Safety Precautions Microwave RadiationContents Specifications Full power throughout the cooking timeApprox % of Full power Approx %Microwave Radiation AntennaInstallation InstallingEarthing Instructions Features Control Panel Operating InstructionsMore Pressing More will add 10 seconds to the cooking time Cooking timeOperating Sequence Schematic Diagram Circuit Description Service Information Tools and Measuring InstrumentsMicrowave Leakage Test Necessary ToolsMeasurement with Outer Case Removed Measurement with a Fully Assembled OvenAround the magnetron Waveguide Measurement of Microwave Power Output Disassembly and AdjustmentPower Supply Cord Control Panel AssemblyPCB Assembly Removal Door Main Assembly RemovalAIR Duct Assembly Removal Magnetron RemovalRemoving the Turntable Motor Very CarefullyFAN Motor Assembly Removal High Voltage Transformer RemovalHigh Voltage Capacitor and Diode Removal Interlock SystemPrimary Interlock Switch Test Secondary Interlock Switch TestMonitor Switch Test SwitchesComponent Test Procedure High Voltage Transformer Wire leads removedFilament Winding Primary Terminal MagnetronHigh Voltage Measure the resistance Normal Momentarily indicatesCapacitor Measure the continuity Forward Normal ContinuityPower RelayLevel FAN MotorTrouble Shooting Condition Cause RemedyDefective PCB assembly Defective key membrane assembly Defective PCB assemblySome inputs cannot be programmed Continuity No continuityCheck continuity Continuity Monitor Switch with Door closed Power supplyReplace power supply cord Fuse blowsSetting time Check continuity Secondary switchDefective PCB Replace PCB Assembly Power source Rating voltage Voltage Normal DisconnectDefective PCB assembly Defective high voltage transformer Abnormal Defective PCB assemblyReplace high voltage diode Replace magnetron Exploded View IntroductionDoor Parts Control Panel Parts Oven Cavity Parts Larch Board Parts Interior Parts WTT021 WTP004 56501A 54974TBase Plate Parts

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