LG Electronics MS3447GR Service Information, Tools and Measuring Instruments, Necessary Tools

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SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

NECESSARY TOOLS

NECESSARY MEASURING INSTRUMENTS

Tools normally used for TV servicing are sufficient.

• TESTER (VOLTS-DC, AC, Ohmmeter)

Standard tools are listed below.

• Microwave survey meter

• Diagonal pliers

- Holaday HI-1500

• Long nose pliers

HI-1501

• Phillips screwdriver

- Narda 8100

• Flat blade screwdriver

8200

• Wrench (size 5mm)

• Inch scale

• Nutdriver (size 5mm)

• 600 cc non conductive material beaker (glass or plastic),

• Adjustable wrench

inside diameter: approx. 8.5 cm (31/2 in.)

• Soldering iron

• Cylindrical and made of borosilicate glass vessel.

• Solder

max. thickness: 3 mm

• Vinyl insulation tape

outside diameter: approx. 190mm

• Polishing cloth

height: approx. 90mm

 

 

• Glass thermometer: 100°C or 212°F (1 deg scale)

MICROWAVE LEAKAGE TEST

CAUTIONS

•Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing.

•The service personnel should inform the manufacture importer, or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW/cm2 and should repair any unit found to have excessive emission levels at no cost to the owner and should ascertain the cause of the excessive leakage. The service personnel should instruct the owner not to use the unit until the oven has been brought into compliance.

•If the oven operates with the door open, the service personnel should:

-Tell the user not to operate the oven.

-Contact the manufacturer.

•The service personnel should check all surface and vent openings for microwave leakage.

•Check for microwave leakage after every servicing. The power density of the microwave radiation leakage emitted by the microwave oven should not exceed

4 mW/cm2. Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage.

MEASURING MICROWAVE ENERGY LEAKAGE

•Pour 275±15cc of 20±5°C(68±9°F) water in a beaker which is graduated to 600 cc, and place the beaker on the center of the turntable.

•Set the energy leakage monitor to 2,450 MHz and use it following the manufacturer's recommended test procedure to assure correct result.

•When measuring the leakage, always use the 2- inch (5cm) spacer supplied with the probe.

•Operate the oven at its maximum output.

•Measure the microwave radiation using and electromagnetic radiation monitor by holding the probe perpendicular to the surface being measured

Move probe along shaded area

Probe scanning speed Less than 2.5 cm/sec (1 in/sec)

LGE Internal Use Only

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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 Approx % SpecificationsFull power throughout the cooking time Approx % of Full powerAntenna Microwave RadiationEarthing Instructions InstallationInstalling Cooking time Features Control PanelOperating Instructions More Pressing More will add 10 seconds to the cooking timeOperating Sequence Schematic Diagram Circuit Description Necessary Tools Service InformationTools and Measuring Instruments Microwave Leakage TestAround the magnetron Waveguide Measurement with Outer Case RemovedMeasurement with a Fully Assembled Oven Control Panel Assembly Measurement of Microwave Power OutputDisassembly and Adjustment Power Supply CordDoor Main Assembly Removal PCB Assembly RemovalVery Carefully AIR Duct Assembly RemovalMagnetron Removal Removing the Turntable MotorInterlock System FAN Motor Assembly RemovalHigh Voltage Transformer Removal High Voltage Capacitor and Diode RemovalSwitches Primary Interlock Switch TestSecondary Interlock Switch Test Monitor Switch TestMagnetron Component Test ProcedureHigh Voltage Transformer Wire leads removed Filament Winding Primary TerminalMeasure the continuity Forward Normal Continuity High VoltageMeasure the resistance Normal Momentarily indicates CapacitorFAN Motor PowerRelay LevelCondition Cause Remedy Trouble ShootingContinuity No continuity Defective PCB assemblyDefective key membrane assembly Defective PCB assembly Some inputs cannot be programmedFuse blows Check continuity Continuity Monitor Switch with Door closedPower supply Replace power supply cordPower source Rating voltage Voltage Normal Disconnect Setting time Check continuitySecondary switch Defective PCB Replace PCB AssemblyReplace high voltage diode Replace magnetron Defective PCB assembly Defective high voltage transformerAbnormal Defective PCB assembly 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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