LG Electronics MS3447GRS Component Test Procedure, High Voltage Transformer Wire leads removed

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COMPONENT TEST PROCEDURE

CAUTIONS

1.DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE PAGE 2-1)

2.ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN.

COMPONENTS

TEST PROCEDURE

RESULTS

HIGH VOLTAGE TRANSFORMER (Wire leads removed)

FILAMENT

WINDING

PRIMARY

TERMINAL

1.Measure the resistance. (Ohm-meter scale: Rx1 and Rx100)

• Primary winding

Approx.: 0.2 ~ 0.4 ohm

• Secondary winding

Approx.: 70 ~100 ohm

• Filament winding

Less than: 1 ohm

2. Measure the resistance.

 

(Ohm-meter scale: Rx1000)

 

• Primary winding to ground

Normal: Infinite

• Filament winding to ground

Normal: Infinite

MAGNETRON

(Wire leads removed)

1.

Measure the resistance.

 

 

(Ohm-meter scale: Rx1)

Normal: Less than 1 ohm

 

• Filament terminal

 

2.

Measure the resistance.

 

 

(Ohm-meter scale: Rx1000)

Normal: Infinite

 

• Filament to chassis

 

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

5-8

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 AntennaInstallation InstallingEarthing Instructions 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 ToolsMeasurement with Outer Case Removed Measurement with a Fully Assembled OvenAround the magnetron Waveguide 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 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

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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