LG Electronics MS3447GRS service manual PCB Assembly Removal, Door Main Assembly Removal

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D. PCB ASSEMBLY REMOVAL

1)Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.)

2)Remove screws which hold the PCB SUB ASS ’Y to the control panel.

3)Disconnect the flat cable from the PCB SUB ASS’Y and take off the PCB SUB ASS ’Y

E. DOOR MAIN ASSEMBLY REMOVAL

1)Open the door.

2)Remove the choke cover very carefully with a flat-blade screwdriver.

CAUTION: Be careful not to damage door seal plate by screwdriver.

3) Lift up and push the door.

NOTE:

1.After replacing the door, be sure to check that the primary switch, monitor switch, and secondary switch operate normally.

2.After replacing the door, check for microwave energy leakage with a survey meter. Microwave energy must be below the limit of 4 mW/cm2. (with a 275 ml water load)

3.When mounting the door assembly to the oven assembly, be sure to adjust the door assembly parallel to the chassis. Also adjust so the door has no play between the inner door surface and oven frame assembly. If the door assembly is not mounted properly, microwaves may leak from the clearance between the door and the oven.

Remove choke cover

Remove door assembly

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

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LGE Internal Use Only

Only for training and service purposes

 

 

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Contents Microwave Oven Safety Precautions Microwave RadiationContents Approx % of Full power SpecificationsFull power throughout the cooking time Approx %Microwave Radiation AntennaEarthing Instructions InstallationInstalling More Pressing More will add 10 seconds to the cooking time Features Control PanelOperating Instructions Cooking timeOperating Sequence Schematic Diagram Circuit Description Microwave Leakage Test Service InformationTools and Measuring Instruments Necessary ToolsAround the magnetron Waveguide Measurement with Outer Case RemovedMeasurement with a Fully Assembled Oven Power Supply Cord Measurement of Microwave Power OutputDisassembly and Adjustment Control Panel AssemblyPCB Assembly Removal Door Main Assembly RemovalRemoving the Turntable Motor AIR Duct Assembly RemovalMagnetron Removal Very CarefullyHigh Voltage Capacitor and Diode Removal FAN Motor Assembly RemovalHigh Voltage Transformer Removal Interlock SystemMonitor Switch Test Primary Interlock Switch TestSecondary Interlock Switch Test SwitchesFilament Winding Primary Terminal Component Test ProcedureHigh Voltage Transformer Wire leads removed MagnetronCapacitor High VoltageMeasure the resistance Normal Momentarily indicates Measure the continuity Forward Normal ContinuityLevel PowerRelay FAN MotorTrouble Shooting Condition Cause RemedySome inputs cannot be programmed Defective PCB assemblyDefective key membrane assembly Defective PCB assembly Continuity No continuityReplace power supply cord Check continuity Continuity Monitor Switch with Door closedPower supply Fuse blowsDefective PCB Replace PCB Assembly Setting time Check continuitySecondary switch Power source Rating voltage Voltage Normal DisconnectReplace high voltage diode Replace magnetron Defective PCB assembly Defective high voltage transformerAbnormal Defective PCB assembly Exploded View IntroductionDoor Parts Control Panel Parts Oven Cavity Parts Larch Board Parts Interior Parts WTT021 WTP004 56501A 54974TBase 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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