Temperature sensing circuit | LG Electronics GR-P257/L257 specs

EXPLATION FOR MICOM CIRCUIT

1-7. Temperature sensing circuit

(1)GR-P227/L227/P257/L257

The circuits involving the freezer and refrigerator sensors control the temperature in both the freezer and the refrigerator. The icemaker sensor detects when ice is made. The defrost sensor determines both the need for defrosting and the efficiency of the defrost operation. See the table below for voltages and checkpoints.

SENSOR	CHECK POINT	NORMAL(-22 °F ~ 122 °F)	IN SHORT	IN OPEN
Freezing sensor	POINT A Voltage
Defrost sensor	POINT B Voltage
Refrigerator sensor 1	POINT C Voltage	0.5 V~4.5 V	0 V	5 V
Refrigerator sensor 2	POINT D Voltage
Magic room/ Opti Fresh Sensor	POINT E Voltage

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LG Electronics GR-P257/L257, GR-P227/L227 service manual Temperature sensing circuit, Short Open

Contents

Refrigerator Contents Page Front View Specifications Ref No. GR-L227 Ref No. GR-P257 Ref No. GR-L257 Freezer Refrigerator compartment compartment Parts Identification Ref No. GR-P227/GR-P257EXTERNAL Filter Parts Identification Parts Identification How to Adjust Door Height of Refrigerator HOW to Install Refrigerator How to Install Water Pipe Before InstallationClass Shape and Spec Nomenclature Single Lever Type Faucet general Connection of Pipe Connector a and BTwo Hands Type Faucet General Type When customer uses bottled water Filter CleaningOutternal Filter Filter Fixation Replacement of water filter After installing water filter Confirm the amount of water supplied to the icemaker How to Control the Amount of Water Supplied to Icemaker Display Power saving Mode Door Alarm Buzzer Mute ModeMicom Function Monitor Panel Description of Function Exhibition Mode LCD Back Light Control Outside temperature display functionLock function display button lock Filter condition display function Dispenser use selection When ice maker does not operate smoothlyAutomatic ice maker Express Freezer Super freezing Miracle Zone functionControl of variable type of freezing room fan Control of M/C room fan motor Door opening alarmDoors of freezing Or home bar Sequential operation of built-in product Failure Diagnosis Function Test Function Mode Operation Contents Remarks Function of dispenser and water dispenser built-in Test Mode 1 Status LCD Test Mode 2 Status LCD Explation for Micom Circuit Power circuitExplanation for PWB circuit GR-P227/L227 Reset circuit Oscillation circuitGR-P227/L227/P257/L257 Load Driving Circuit Load/dispenser operation, door opening circuit Dispenser operation circuit Lever Switch sensing circuit Measuring part Door opening sensing circuit Short Open Temperature sensing circuit Switch entry circuit Option designation circuit model separation functionSeparation Connection Status Application Standard Stepping motor operation circuit Fan motor driving circuit freezer, mechanical area +5 C +9F 33 k Ω 56 k Ω JCR1 Main PCB Sensor resistance characteristics table Miracle Zone Stepping Motor / Display Operation Principle Icemaking Mode Harvest ModeFill/Park Position Water supply amount Table Defect diagnosis function Stage Items Indicator Remarks Circuit Trouble Diagnosis Trouble Shooting Not performed Evaporator by heating as Refrigeration Refrigeration Residual Refrigeration No cooling air circulation Is weak Fan does not work Recess Sounds Compressor compartment operating sounds Bad soldering Bad rivet contact Short Structure Door foam Appearance Sag Power FaultsProblems Causes Checks Measures Remarks Problems Causes Checks Measures Temperature Cooling Disconnected from the motor Refer to fan motor disassembly Problems Causes Defrosting failureMeasures Remarks Remove the parts and replace it Icing Discharging port of cooling air Sound Click Contraction of evaporator Sources Sound Burping It happens when refrigerant expands Odor Micom Problems Symptom Causes Checks Measures Remarks Driving circuits Motor damper Replace door switch Trouble Diagnosis Items Unit Standards Purposes Remarks Cooling Cycle Heavy Repair Summary Of Heavy Repair Process Contents Tools Items Precautions Precautions During Heavy Repair When replacing a compressor When replacing a drierPractical Work For Heavy Repair Inserting a capillary tube Vacuum Sequence Pipe ConnectionCharging sequence Calculation of amount of refrigerant charged 12-0mm Standard Regulations For Heavy Repair Brazing Reference Drawings Asia / Middle-East AfricaEurope & CIS / America Explain the principles of temperature change Problems Checks and MeasuresSound depends on the installation location Explain general principles of sounds Explain the flow of refrigerant Explain the procedure and principles of ice maker operationExplain the characteriistics of moving parts Explain the principles of water supplied to dispenser Measures for Symptoms on Temperature Odor and Frost Check the temperature control button and set at strongExplain the basic principles of food odor Explain the basic principles of frost formation Others Remove a freezer door HOW to Disassemble and Assemble Handle InsertTubeLineColletClip Assembly COVER, Dispenser Exploded View Optional part Ref No. GR-P227/GR-P257 Ref No. GR-L227/GR-L257 Freezer Compartment Optional part Refrigerator Compartment Machine Compartment ICE & Water Part Dispenser Part No JD8999A