LG Electronics MS3447GRS service manual Trouble Shooting, Condition Cause Remedy

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TROUBLE SHOOTING

WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL.

CAUTIONS

1.Check grounding before checking for trouble.

2.Be careful of the high voltage circuit.

3.Discharge the high voltage capacitor. (See page 2-1)

4.When checking the continuity of the switches or of the high voltage transformer, disconnect one lead wire from these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

5.Do not touch any part of the circuit on the PCB since static electric discharge may damage this control panel.

Always touch yourself to ground while working on this panel to discharge any static charge built up in your body. (Micom model only)

CONDITION

CAUSE

 

REMEDY

 

 

 

Microwave oven

does not work.

Output power is too low.

Inserting many plugs into one outlet and using them at the

same time

(blown fuse or breaker)

Microwave oven plug is not inserted tightly.

Low AC input voltage.

Food temperature is too low.

Avoid using other electrical appliances when you use the microwave oven.

Insert microwave oven plug securely.

Use the microwave oven at adequate line voltage.

This may not be a defect. It is possible that the food should be cooked for a longer time period.

Sparks occur.

Uneven cooking.

Using metallic ware and allowing it to touch the oven wall.

Ceramic ware trimmed in gold or silver powder is used.

Inconsistent intensity of microwave by their characteristics.

Do not use metallic ware for cooking except that noted in the cooking guide.

Do not use any type of cookware with metallic trimming.

1.Use plastic wrap or lid.

2.Stir once or twice while cooking soup, cocoa or milk, etc.

LGE Internal Use Only

5-11

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

 

 

Only for training and service purposes

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Contents Microwave Oven Microwave Radiation Safety PrecautionsContents Full power throughout the cooking time SpecificationsApprox % of Full power Approx %Antenna Microwave RadiationInstallation InstallingEarthing Instructions Operating Instructions Features Control PanelMore Pressing More will add 10 seconds to the cooking time Cooking timeOperating Sequence Schematic Diagram Circuit Description Tools and Measuring Instruments Service InformationMicrowave Leakage Test Necessary ToolsMeasurement with Outer Case Removed Measurement with a Fully Assembled OvenAround the magnetron Waveguide Disassembly and Adjustment Measurement of Microwave Power OutputPower Supply Cord Control Panel AssemblyDoor Main Assembly Removal PCB Assembly RemovalMagnetron Removal AIR Duct Assembly RemovalRemoving the Turntable Motor Very CarefullyHigh Voltage Transformer Removal FAN Motor Assembly RemovalHigh Voltage Capacitor and Diode Removal Interlock SystemSecondary Interlock Switch Test Primary Interlock Switch TestMonitor Switch Test SwitchesHigh Voltage Transformer Wire leads removed Component Test ProcedureFilament Winding Primary Terminal MagnetronMeasure the resistance Normal Momentarily indicates High VoltageCapacitor Measure the continuity Forward Normal ContinuityRelay PowerLevel FAN MotorCondition Cause Remedy Trouble ShootingDefective key membrane assembly Defective PCB assembly Defective PCB assemblySome inputs cannot be programmed Continuity No continuityPower supply Check continuity Continuity Monitor Switch with Door closedReplace power supply cord Fuse blowsSecondary switch Setting time Check continuityDefective 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 Introduction Exploded ViewDoor Parts Control Panel Parts Oven Cavity Parts Larch Board Parts WTT021 WTP004 56501A 54974T Interior PartsBase Plate Parts

MS3447GR, MS3447GRS specifications

The LG Electronics MS3447GRS and MS3447GR are innovative microwave models designed to enhance your cooking experience with a blend of advanced technology and user-friendly features. Both models are built to accommodate various culinary needs, making them ideal for any kitchen.

One standout feature of the MS3447GRS and MS3447GR is the Smart Inverter technology. This technology provides precise cooking power control, allowing users to defrost, reheat, and cook food evenly. This results in better texture and flavor retention in various dishes, surpassing traditional microwaves that may only provide two or three levels of heating.

Another significant characteristic is the EasyClean interior. This feature ensures that maintaining a clean microwave is hassle-free. The interior surface can be wiped down easily, helping to prevent the buildup of food residues and odors, which allows for a more hygienic cooking environment over time.

The LG MS3447GRS and MS3447GR also come equipped with a range of auto-cook options. These preset cooking modes simplify meal preparation, allowing users to cook a variety of dishes such as popcorn, baked potatoes, and frozen meals with just the push of a button. This is particularly beneficial for busy individuals and families looking to streamline their cooking process.

Additionally, these models boast a sleek and modern design that seamlessly integrates into any kitchen decor. The clean lines, polished finishes, and intuitive control panel make it an attractive and functional appliance. The user interface is designed for ease of use, with clear indicators and a layout that simplifies operation.

Both microwaves feature a spacious interior, which provides ample room for a variety of cookware sizes, making it easier to heat larger dishes. The turntable ensures that food is cooked evenly, while the powerful wattage guarantees efficient cooking times.

In conclusion, the LG Electronics MS3447GRS and MS3447GR microwave models are exemplary devices that combine cutting-edge technology with practical features. Their Smart Inverter, EasyClean technology, and flexible cooking options cater to the needs of modern kitchens, affirming LG's commitment to innovation and quality in kitchen appliances. Whether you're reheating leftovers or preparing a family meal, these microwaves make cooking simpler and more efficient.
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