Manuals / LG Electronics / Kitchen Appliance / Refrigerator

LG Electronics GR-P257/L257 Temperature sensing circuit, Explation For Micom Circuit, Sensor

Models: GR-P257/L257 GR-P227/L227

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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 Temperature sensing circuit, Explation For Micom Circuit, GR-P227/L227/P257/L257, Sensor

Contents

SERVICE MANUAL http//eic.lgservice.comREFRIGERATOR MODEL GR-P227/L227 GR-P257/L257WARNINGS AND PRECAUTIONS FOR SAFETY CONTENTSSPECIFICATIONS HOW TO INSTALL THE REFRIGERATORWARNINGS AND PRECAUTIONS FOR SAFETY 1. Ref No. GR-P227 SPECIFICATIONSSPECIFICATIONS SPECIFICATIONSSPECIFICATIONS 2. Ref No. GR-L227SPECIFICATIONS SPECIFICATIONSSPECIFICATIONS 1. Ref No. GR-P257SPECIFICATIONS SPECIFICATIONSSPECIFICATIONS 2. Ref No. GR-L257SPECIFICATIONS SPECIFICATIONSPARTS IDENTIFICATION 1. Ref No. GR-P227/GR-P257 INTERNAL FILTERFreezer Refrigerator compartment compartment PARTS IDENTIFICATION 2. Ref No. GR-P227/GR-P257 EXTERNAL FILTERFreezer Refrigerator compartment compartment Cover PWB3. Ref No. GR-P227/GR-P257 INTERNAL FILTER PARTS IDENTIFICATIONFreezer Refrigerator compartment compartment 4. Ref No. GR-P227/GR-P257 EXTERNAL FILTER PARTS IDENTIFICATIONFreezer Refrigerator compartment compartment 1. How to Adjust Door Height of Refrigerator HOW TO INSTALL REFRIGERATOR1. If the height of freezer door is lower than that of 2. If the height of freezer door is higher than that ofHOW TO INSTALL REFRIGERATOR 2. How to Install Water PipeBefore Installation 2-1. When connecting directly to the water tap1. Connection of Pipe Connector A and B HOW TO INSTALL REFRIGERATORHot Water Cold Water3. When customer uses bottled water HOW TO INSTALL REFRIGERATOR2. Filter Cleaning Outternal Filter 1. Filter FixationInstall Water Filter Applicable to some models only HOW TO INSTALL REFRIGERATORBefore Installing water filter Installing water filter 1. Initial installation of water filter3. How to Control the Amount of Water Supplied to Icemaker 3-1. Confirm the amount of water supplied to the icemakerHOW TO INSTALL REFRIGERATOR 1. Monitor Panel MICOM FUNCTION1-2. Display Second Function 1. Door Alarm Buzzer Mute Mode2-1-1. Funnction of Temperature Selection 2. Description of FunctionPower Initially On MICOM FUNCTIONMICOM FUNCTION 2-1-3. Outside temperature display function2-1-2. LCD Back Light Control 2-1-4. Lock function display button lock2-2. Dispenser use selection 2-4. When ice maker does not operate smoothly2-3. Automatic ice maker 2-5. Express Freezer2-8. *Miracle Zone function 2-7. Super freezing2-9. Control of variable type of freezing room fan MICOM FUNCTION2-10. Control of M/C room fan motor 2-11. Door opening alarmDoors of freezing or home barIf error occurs 2-15. Sequential operation of built-in producttemperature of a when closingMICOM FUNCTION 2-16. Failure Diagnosis FunctionContents 2-17. Test FunctionMICOM FUNCTION ModeTEST MODE 1 STATUS LCD TEST MODE 2 STATUS LCD 2-18. Function of dispenser and water dispenser built-inMICOM FUNCTION 1-1. Power circuit EXPLATION FOR MICOM CIRCUIT1. Explanation for PWB circuit 1-2. Oscillation circuit 1-3. Reset circuitEXPLATION FOR MICOM CIRCUIT 1 GR-P227/L227/P257/L257EXPLATION FOR MICOM CIRCUIT 1-4. Load/dispenser operation, door opening circuit1. LOAD DRIVING CIRCUIT 1 GR-P227/L227/P257/L2572 Lever Switch sensing circuit Measuring part 1-5. Dispenser operation circuitEXPLATION FOR MICOM CIRCUIT 1 GR-P227/L227/P257/L257EXPLATION FOR MICOM CIRCUIT 1-6. Door opening sensing circuit1 GR-P227/L227/P257/L257 Measuring partEXPLATION FOR MICOM CIRCUIT 1-7. Temperature sensing circuit1 GR-P227/L227/P257/L257 SENSOR1-9. Option designation circuit model separation function 1-8. Switch entry circuitEXPLATION FOR MICOM CIRCUIT 1 GR-P227/L227/P257/L257EXPLATION FOR MICOM CIRCUIT 1-10. Stepping motor operation circuitCCW Reverse rotation Positive rotation CW1-11. Fan motor driving circuit freezer, mechanical area EXPLATION FOR MICOM CIRCUIT1 GR-P227/L227/P257/L257 1. Temperature compensation in freezer and refrigerator 1-12. Temperature compensation and temperature compensation circuitEXPLATION FOR MICOM CIRCUIT 1 GR-P227/L227/P257/L257EXPLATION FOR MICOM CIRCUIT 2. Compensation circuit for temperature at freezer EXPLATION FOR MICOM CIRCUIT1 GR-P227/L227/P257/L257 DC GND Transmission error status L/Wire FD/H4-wiresEXPLATION FOR MICOM CIRCUIT 1 GR-P227/L227/P257/L257EXPLATION FOR MICOM CIRCUIT 2 Sensor resistance characteristics tableFreezing Sensor Refrigerator sensor 1&2EXPLATION FOR MICOM CIRCUIT 1-14. Miracle Zone STEPPING MOTOR / DisplayICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 1-1. Operation Principle of Icemaker Power On1. Operation Principle Start Position2-1. Start Position 2. ICEMAKER FUNCTIONS2-3. Harvest Mode 2-4. Fill/Park Position3-1. ERROR CODES shown on Icemaker water supply control panel INDICATORCONTENTS 3. Defect diagnosis function1 GR-P227/L227/P257/L257GR-P227/L227/P257/L257 CIRCUITTROUBLE DIAGNOSIS 1. Trouble ShootingHOW TO CHECK CLAIMSTROUBLE DIAGNOSIS HOW TO CHECKCLAIMS CAUSES AND CHECK POINTSTROUBLE DIAGNOSIS HOW TO CHECKCLAIMS CAUSES AND CHECK POINTSFaulty fan motor HOW TO CHECKDoor switch FaultsBad low termperature RPM characteristics HOW TO CHECKInsufficient compressor. - Faulty compressor Faulty fanTROUBLE DIAGNOSIS HOW TO CHECKCLAIMS CAUSES AND CHECK POINTSTROUBLE DIAGNOSIS HOW TO CHECKCLAIMS CAUSES AND CHECK POINTSTROUBLE DIAGNOSIS HOW TO CHECKCLAIMS CAUSES AND CHECK POINTSTROUBLE DIAGNOSIS HOW TO CHECKCLAIMS CAUSES AND CHECK POINTSopened when freezer HOW TO CHECKclosed faulty stopper TROUBLE DIAGNOSIS2-1. Power 2. Faults2-2. Compressor ProblemsProblems 2-3. TemperatureTROUBLE DIAGNOSIS CausesProblems 2-4. CoolingTROUBLE DIAGNOSIS CausesTROUBLE DIAGNOSIS ProblemsCauses ChecksProblems 2-5. Defrosting failureTROUBLE DIAGNOSIS CausesTROUBLE DIAGNOSIS ProblemsCauses ChecksProblems 2-6. IcingTROUBLE DIAGNOSIS CausesTROUBLE DIAGNOSIS ProblemsCauses ChecksProblems 2-7. SoundTROUBLE DIAGNOSIS CausesTROUBLE DIAGNOSIS ProblemsCauses ChecksTROUBLE DIAGNOSIS ProblemsCauses ChecksProblems 2-8. OdorTROUBLE DIAGNOSIS CausesProblems 2-9. MicomSymptom TROUBLE DIAGNOSISSymptom ProblemsTROUBLE DIAGNOSIS CausesSymptom ProblemsTROUBLE DIAGNOSIS CausesSymptom ProblemsTROUBLE DIAGNOSIS CausesSymptom ProblemsTROUBLE DIAGNOSIS CausesTROUBLE DIAGNOSIS 3. Cooling Cycle Heavy RepairItems UnitContents 3-2. Summary Of Heavy Repairreplacement TROUBLE DIAGNOSISPrecautions 3-3. Precautions During Heavy RepairTROUBLE DIAGNOSIS ItemsPrecautions 3-4. Practical Work For Heavy RepairWhen replacing a drier When replacing a compressorTROUBLE DIAGNOSIS PrecautionsItems KEYPOINTINGPrecautions 3-5. Standard Regulations For Heavy RepairTROUBLE DIAGNOSIS 12-0 mmTROUBLE DIAGNOSIS 3-6. Brazing Reference Drawings1 Asia / Middle-East Africa 2 Europe & CIS / America4-1. Sound 4. HOW TO DEAL WITH CLAIMSProblems Explain the principles of temperature changeExplain the procedure and principles of ice maker operation ProblemsTROUBLE DIAGNOSIS Checks and MeasuresProblems 4-2. Measures for Symptoms on TemperatureCheck temperature set in the temperature control knob Explain the characteristics of ice creamProblems 4-3. Odor and FrostCheck the temperature control button and set at “strong” TROUBLE DIAGNOSISProblems 4-5. OthersTROUBLE DIAGNOSIS Checks and Measures1. DOOR HOW TO DISASSEMBLE AND ASSEMBLE2 Remove a freezer door A A B2. HANDLE 3. SHROUD, GRILLE FANHOW TO DISASSEMBLE AND ASSEMBLE 5. FAN AND FAN MOTOR DISASSEMBLY METHOD 4. WATER VALVE DISASSEMBLY METHODHOW TO DISASSEMBLE AND ASSEMBLE InsertTubeLineColletClipAssembly 6. DISPENSERSolenoidAssembly LeverAssembly AssemblyDuctCap7 Dispenser Related Parts HOW TO DISASSEMBLE AND ASSEMBLEEXPLODED VIEW FREEZER DOOR PART GR-P227/L227/P257/L257#EV# REFRIGERATOR DOOR PART Ref No. GR-P227/GR-P257Optional part EXPLODED VIEWEXPLODED VIEW Ref No. GR-L227/GR-L257REFRIGERATOR DOOR PART Optional partEXPLODED VIEW FREEZER COMPARTMENTOptional part 101BEXPLODED VIEW REFRIGERATOR COMPARTMENTOptional part #EV#EXPLODED VIEW MACHINE COMPARTMENTOptional part #EV#EXPLODED VIEW ICE & WATER PARTOptional part 625A 616F 616G 627A 624BEXPLODED VIEW DISPENSER PARTOptional part #EV#FEB., 2006 Printed in Korea P/No. 3828JD8999A

1-7. Temperature sensing circuit

SENSOR

CHECK POINT

IN SHORT

IN OPEN