LG Electronics MS3447GRS service manual Relay, Power, Level, FAN Motor, Turntable

Page 20

COMPONENTS

TEST PROCEDURE

 

RESULTS

 

RELAY 2

Check for continuity of relay 2 with an

POWER

 

 

 

ohm-meter.

 

 

 

LEVEL

 

 

 

(Remove wire leads from relay 2 and

 

 

 

 

 

 

 

operate the unit.)

 

 

 

 

1

4 sec

18 sec

 

 

 

 

 

 

 

 

 

 

2

6 sec

16 sec

 

 

 

 

 

3

8 sec

14 sec

 

 

 

 

 

4

10 sec

12 sec

 

 

 

 

 

5

12 sec

10 sec

 

 

 

 

 

 

 

 

 

 

6

14 sec

8 sec

 

 

 

 

 

7

16 sec

6 sec

 

 

 

 

 

8

18 sec

4 sec

 

 

 

 

 

9

20 sec

2 sec

 

 

 

 

 

 

 

 

 

 

10

22 sec

0 sec

Relay 2

FAN MOTOR

Measure the resistance.

Normal:

 

(Wire leads removed)

(Ohm-meter scale: R x 1)

A: Approx. 85

~ 100 ohm

 

 

B: Approx. 10

~ 25 ohm

 

B

Abnormal: Infinite or several

 

ohm.

A

TURNTABLE

Measure the resistance.

 

Normal: Approx. 100~150 ohm

MOTOR

(Ohm-meter scale: R x 1)

 

Abnormal: Infinite or several

(Wire leads removed)

 

 

 

 

 

ohm.

 

 

 

 

 

 

 

NOTE : • A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.

•MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.

•WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES.

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

5-10

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 AntennaEarthing Instructions InstallationInstalling 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 ToolsAround the magnetron Waveguide Measurement with Outer Case RemovedMeasurement with a Fully Assembled Oven 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 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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