LG Electronics GR-P257/L257, GR-P227/L227 service manual JCR1

Page 39

EXPLATION FOR MICOM CIRCUIT

2.Compensation circuit for temperature at freezer

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

			Temperature compensation in CUT
		JCR1	+1 °C [+1.8 °F]	+2 °C [+3.6 °F]
		JCR2	+1 °C [+1.8 °F]	+2 °C [+3.6 °F]
		JCR2	+1 °C [+1.8 °F]
		JCR3	-1 °C [-1.8 °F]	-2 °C [-3.6 °F]
		JCR4	-1 °C [-1.8 °F]	-2 °C [-3.6 °F]
		JCR4	-1 °C [-1.8 °F]
Compensation		Compensation		Temperature compensation value
for too warm			for too cold	Temperature compensation value		Remarks
for too warm			for too cold	at refrigerator		Remarks
JCR3	JCR4	JCR1	JCR2	at refrigerator
JCR3	JCR4	JCR1	JCR2
				0 °C (In shipment from factory)
CUT				-1	°C [-1.8 °F]
	CUT			-1	°C [-1.8 °F]
		CUT		+1	°C [+1.8 °F]
			CUT	+1	°C [+1.8 °F]
CUT	CUT			-2	°C [-3.6 °F]
		CUT	CUT	+2	°C [+3.6 °F]
CUT		CUT		0 °C [0 °F]
CUT			CUT	0 °C [0 °F]
	CUT	CUT		0 °C [0 °F]
	CUT		CUT	0 °C [0 °F]
CUT	CUT	CUT		-1	°C [-1.8 °F]
	CUT	CUT	CUT	+1	°C [+1.8 °F]
CUT	CUT	CUT	CUT	0 °C [0 °F]

uThis circuit allows adjustment of the set temperature for compensation by changing jumpers at locations JCR1~JCR4.

- 37 -

Image 39

Contents Refrigerator Contents Page Front View SpecificationsRef No. GR-L227 Ref No. GR-P257 Ref No. GR-L257 Freezer Refrigerator compartment compartment Parts IdentificationRef No. GR-P227/GR-P257EXTERNAL Filter Parts Identification Parts Identification How to Adjust Door Height of Refrigerator HOW to Install RefrigeratorHow to Install Water Pipe Before InstallationClass Shape and Spec Nomenclature General Type Connection of Pipe Connector a and BSingle Lever Type Faucet general Two Hands Type FaucetWhen customer uses bottled water Filter CleaningOutternal Filter Filter Fixation Replacement of water filter After installing water filterConfirm the amount of water supplied to the icemaker How to Control the Amount of Water Supplied to IcemakerMonitor Panel Door Alarm Buzzer Mute ModeDisplay Power saving Mode Micom FunctionDescription of Function Exhibition ModeFilter condition display function Outside temperature display functionLCD Back Light Control Lock function display button lockExpress Freezer When ice maker does not operate smoothlyDispenser use selection Automatic ice makerSuper freezing Miracle Zone functionControl of variable type of freezing room fan Or home bar Door opening alarmControl of M/C room fan motor Doors of freezingSequential operation of built-in product Failure Diagnosis Function Test Function Mode Operation Contents RemarksFunction of dispenser and water dispenser built-in Test Mode 1 Status LCD Test Mode 2 Status LCDGR-P227/L227 Power circuitExplation for Micom Circuit Explanation for PWB circuitReset circuit Oscillation circuitGR-P227/L227/P257/L257 Load Driving Circuit Load/dispenser operation, door opening circuitDispenser operation circuit Lever Switch sensing circuit Measuring partDoor opening sensing circuit Short Open Temperature sensing circuitSwitch 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 Water supply amount Table Harvest ModeIcemaking Mode Fill/Park PositionDefect diagnosis function Stage Items Indicator RemarksCircuit Trouble Diagnosis Trouble ShootingNot 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 Problems Causes Checks Measures FaultsPower Problems Causes Checks Measures RemarksTemperature 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 RemarksDriving circuits Motor damper Replace door switch Trouble Diagnosis Items Unit Standards Purposes Remarks Cooling Cycle Heavy RepairSummary Of Heavy Repair Process Contents ToolsItems Precautions Precautions During Heavy RepairInserting a capillary tube When replacing a drierWhen replacing a compressor Practical Work For Heavy RepairCalculation of amount of refrigerant charged Pipe ConnectionVacuum Sequence Charging sequence12-0mm Standard Regulations For Heavy RepairBrazing Reference Drawings Asia / Middle-East AfricaEurope & CIS / America Explain general principles of sounds Problems Checks and MeasuresExplain the principles of temperature change Sound depends on the installation locationExplain the principles of water supplied to dispenser Explain the procedure and principles of ice maker operationExplain the flow of refrigerant Explain the characteriistics of moving partsMeasures for Symptoms on Temperature Explain the basic principles of frost formation Check the temperature control button and set at strongOdor and Frost Explain the basic principles of food odorOthers Remove a freezer door HOW to Disassemble and AssembleHandle InsertTubeLineColletClip Assembly COVER, Dispenser Exploded View Optional part Ref No. GR-P227/GR-P257Ref No. GR-L227/GR-L257 Freezer Compartment Optional part Refrigerator CompartmentMachine Compartment ICE & Water Part Dispenser Part No JD8999A